# The Linux SCSI programming HOWTO

## Heiko Eißfeldt `heiko@colossus.escape.de`

v1.5, 7 May 1996

This document deals with programming the Linux generic SCSI interface.

Archived Document Notice: This document has been archived by the LDP because it does not apply to modern Linux systems. It is no longer being actively maintained.

## 1. What's New?

## 2. Introduction

## 3. What Is The Generic SCSI Interface?

## 4. What Are The Requirements To Use It?

- 4.1 Kernel Configuration
- 4.2 Device Files
- 4.3 Device Mapping

## 5. Programmers Guide

## 6. Overview Of Device Programming

## 7. Opening The Device

## 8. The Header Structure

## 9. Inquiry Command Example

## 10. The Sense Buffer

## 11. Example Using Sense Buffer

## 12. Ioctl Functions

## 13. Driver Defaults

- 13.1 Transfer Lengths
- 13.2 Timeout And Retry Values

## 14. Obtaining The Scsi Specifications

## 15. Related Information Sources

- 15.1 HOWTOs and FAQs
- 15.2 Mailing list
- 15.3 Example code

## 16. Other useful stuff

- 16.1 Device driver writer helpers
- 16.2 Utilities

## 17. Other SCSI Access Interfaces

## 18. Final Comments

## 19. Acknowledgments

## Appendix

## 20. Appendix

## 21. Error handling

- 21.1 Error status decoding
- 21.2 Status codes
- 21.3 SCSI Sense Keys
- 21.4 Host codes
- 21.5 Driver codes

## 22. Additional sense codes and additional sense code qualifiers

- 22.1 ASC and ASCQ in lexical order
- 22.2 ASC and ASCQ in numerical order

## 23. A SCSI command code quick reference

## 24. Example programs

## 1. What's New?

Newer kernels have changed the interface a bit. This affects a section formerly entitled 'rescanning the devices'. Now it is possible to add/remove SCSI devices on the fly.

Since kernel 1.3.98 some important header files have been moved/split (sg.h and scsi.h).

Some stupid bugs have been replaced by newer ones.

## 2. Introduction

This document is a guide to the installation and programming of the Linux generic SCSI interface.

It covers kernel prerequisites, device mappings, and basic interaction with devices. Some simple C programming examples are included. General knowledge of the SCSI command set is required; for more information on the SCSI standard and related information, see the appendix to this document.

Note the plain text version of this document lacks cross references (they show up as ``'').

## 3. What Is The Generic SCSI Interface?

The generic SCSI interface has been implemented to provide general SCSI access to (possibly exotic) pieces of SCSI hardware. It was developed by Lawrence Foard (`entropy@world.std.com`) and sponsored by Killy Corporation (see the comments in `scsi/sg.h`).

The interface makes special device handling possible from user level applications (i.e. outside the kernel). Thus, kernel driver development, which is more risky and difficult to debug, is not necessary.

However, if you don't program the driver properly it is possible to hang the SCSI bus, the driver, or the kernel. Therefore, it is important to properly program the generic driver and to first back up all files to avoid losing data. Another useful thing to do before running your programs is to issue a `sync` command to ensure that any buffers are flushed to disk, minimizing data loss if the system hangs.

Another advantage of the generic driver is that as long as the interface itself does not change, all applications are independent of new kernel development. In comparison, other low-level kernel drivers have to be synchronized with other internal kernel changes.

Typically, the generic driver is used to communicate with new SCSI hardware devices that require special user applications to be written to take advantage of their features (e.g. scanners, printers, CD-ROM jukeboxes). The generic interface allows these to be written quickly.

## 4. What Are The Requirements To Use It?

## 4.1 Kernel Configuration

You must have a supported SCSI controller, obviously. Furthermore, your kernel must have controller support as well as generic support compiled in. Configuring the Linux kernel (via `make config` under /usr/src/linux) typically looks like the following:

> `

>      ...
>     *
>     * SCSI support
>     *
>     SCSI support? (CONFIG_SCSI) [n] y
>     *
>     * SCSI support type (disk, tape, CDrom)
>     *
>      ...
>     Scsi generic support (CONFIG_CHR_DEV_SG) [n] y
>     *
>     * SCSI low-level drivers
>     *
>      ...

> `

If available, modules can of course be build instead.

## 4.2 Device Files

The generic SCSI driver uses its own device files, separate from those used by the other SCSI device drivers. They can be generated using the `MAKEDEV` script, typically found in the `/dev` directory. Running `MAKEDEV sg` produces these files:

> `

>     crw-------   1 root     system    21,   0 Aug 20 20:09 /dev/sga
>     crw-------   1 root     system    21,   1 Aug 20 20:09 /dev/sgb
>     crw-------   1 root     system    21,   2 Aug 20 20:09 /dev/sgc
>     crw-------   1 root     system    21,   3 Aug 20 20:09 /dev/sgd
>     crw-------   1 root     system    21,   4 Aug 20 20:09 /dev/sge
>     crw-------   1 root     system    21,   5 Aug 20 20:09 /dev/sgf
>     crw-------   1 root     system    21,   6 Aug 20 20:09 /dev/sgg
>     crw-------   1 root     system    21,   7 Aug 20 20:09 /dev/sgh
>                                        |    |
>                                    major,   minor device numbers

> `

Note that these are character devices for raw access. On some systems these devices may be called `/dev/{sg0,sg1,...}`, depending on your installation, so adjust the following examples accordingly.

## 4.3 Device Mapping

These device files are dynamically mapped to SCSI id/LUNs on your SCSI bus (LUN = logical unit). The mapping allocates devices consecutively for each LUN of each device on each SCSI bus found at time of the SCSI scan, beginning at the lower LUNs/ids/buses. It starts with the first SCSI controller and continues without interruption with all following controllers. This is currently done in the initialisation of the SCSI driver.

For example, assuming you had three SCSI devices hooked up with ids 1, 3, and 5 on the first SCSI bus (each having one LUN), then the following mapping would be in effect:

> `

>     /dev/sga -> SCSI id 1
>     /dev/sgb -> SCSI id 3
>     /dev/sgc -> SCSI id 5

> `

If you now add a new device with id 4, then the mapping (after the next rescan) will be:

> `

>     /dev/sga -> SCSI id 1
>     /dev/sgb -> SCSI id 3
>     /dev/sgc -> SCSI id 4
>     /dev/sgd -> SCSI id 5

> `

Notice the change for id 5 -- the corresponding device is no longer mapped to `/dev/sgc` but is now under `/dev/sgd`.

Luckily newer kernels allow for changing this order.

### Dynamically insert and remove SCSI devices

If a newer kernel and the `/proc` file system is running, a non-busy device can be removed and installed 'on the fly'.

To remove a SCSI device:

> `

>     echo "scsi remove-single-device a b c d" > /proc/scsi/scsi

> `

and similar, to add a SCSI device, do

> `

>     echo "scsi add-single-device a b c d" > /proc/scsi/scsi

> `

where

> `

>           a == hostadapter id (first one being 0)
>           b == SCSI channel on hostadapter (first one being 0)
>           c == ID
>           d == LUN (first one being 0)

> `

So in order to swap the `/dev/sgc` and `/dev/sgd` mappings from the previous example, we could do

> `

>     echo "scsi remove-single-device 0 0 4 0" > /proc/scsi/scsi
>     echo "scsi remove-single-device 0 0 5 0" > /proc/scsi/scsi
>     echo "scsi add-single-device 0 0 5 0" > /proc/scsi/scsi
>     echo "scsi add-single-device 0 0 4 0" > /proc/scsi/scsi

> `

since generic devices are mapped in the order of their insertion.

When adding more devices to the scsi bus keep in mind there are limited spare entries for new devices. The memory has been allocated at boot time and has room for 2 more devices.

## 5. Programmers Guide

The following sections are for programmers who want to use the generic SCSI interface in their own applications. An example will be given showing how to access a SCSI device with the INQUIRY and the TESTUNITREADY commands.

When using these code examples, note the following:

- the location of the header files `sg.h` and `scsi.h` has changed in kernel version 1.3.98. Now these files are located at `/usr/src/linux/include/scsi`, which is hopefully linked to `/usr/include/scsi`. Previously they were in `/usr/src/linux/drivers/scsi`. We assume a newer kernel in the following text.
- the generic SCSI interface was extended in kernel version 1.1.68; the examples require at least this version. But please avoid kernel version 1.1.77 up to 1.1.89 and 1.3.52 upto 1.3.56 since they had a broken generic scsi interface.
- the constant DEVICE in the header section describing the accessed device should be set according to your available devices (see section sec-header .

## 6. Overview Of Device Programming

The header file `include/scsi/sg.h` contains a description of the interface (this is based on kernel version 1.3.98):

> `

>     struct sg_header
>      {
>       int pack_len;
>                        /* length of incoming packet (including header) */
>       int reply_len;   /* maximum length of expected reply */
>       int pack_id;     /* id number of packet */
>       int result;      /* 0==ok, otherwise refer to errno codes */
>       unsigned int twelve_byte:1;
>                    /* Force 12 byte command length for group 6 & 7 commands  */
>       unsigned int other_flags:31;                  /* for future use */
>       unsigned char sense_buffer[16]; /* used only by reads */
>       /* command follows then data for command */
>      };

> `

This structure describes how a SCSI command is to be processed and has room to hold the results of the execution of the command. The individual structure components will be discussed later in section sec-header .

The general way of exchanging data with the generic driver is as follows: to send a command to an opened generic device, `write()` a block containing these three parts to it:

> `

>     struct sg_header
>     SCSI command
>     data to be sent with the command

> `

To obtain the result of a command, `read()` a block with this (similar) block structure:

> `

>     struct sg_header
>     data coming from the device

> `

This is a general overview of the process. The following sections describe each of the steps in more detail.

NOTE: Up to recent kernel versions, it is necessary to block the SIGINT signal between the `write()` and the corresponding `read()` call (i.e. via `sigprocmask()`). A return after the `write()` part without any `read()` to fetch the results will block on subsequent accesses. This signal blocking has not yet been included in the example code. So better do not issue SIGINT (a la ^C) when running these examples.

## 7. Opening The Device

A generic device has to be opened for read and write access:

> `

>             int fd = open (device_name, O_RDWR);

> `

(This is the case even for a read-only hardware device such as a cdrom drive).

We have to perform a `write` to send the command and a `read` to get back any results. In the case of an error the return code is negative (see section sec-errorhandling for a complete list).

## 8. The Header Structure

The header structure `struct sg_header` serves as a controlling layer between the application and the kernel driver. We now discuss its components in detail.

int pack_len

  defines the size of the block written to the driver. This is defined within the kernel for internal use.

int reply_len

  defines the size of the block to be accepted at reply. This is defined from the application side.

int pack_id

  This field helps to assign replies to requests. The application can supply a unique id for each request. Suppose you have written several commands (say 4) to one device. They may work in parallel, one being the fastest. When getting replies via 4 reads, the replies do not have to have the order of the requests. To identify the correct reply for a given request one can use the `pack_id` field. Typically its value is incremented after each request (and wraps eventually). The maximum amount of outstanding requests is limited by the kernel to SG_MAX_QUEUE (eg 4).

int result

  the result code of a `read` or `write` call. This is (sometimes) defined from the generic driver (kernel) side. It is safe to set it to null before the `write` call. These codes are defined in `errno.h` (0 meaning no error).

unsigned int twelve_byte:1

  This field is necessary only when using non-standard vendor specific commands (in the range 0xc0 - 0xff). When these commands have a command length of 12 bytes instead of 10, this field has to be set to one before the write call. Other command lengths are not supported. This is defined from the application side.

unsigned char sense_buffer[16]

  This buffer is set after a command is completed (after a `read()` call) and contains the SCSI sense code. Some command results have to be read from here (e.g. for `TESTUNITREADY`). Usually it contains just zero bytes. The value in this field is set by the generic driver (kernel) side.

The following example function interfaces directly with the generic kernel driver. It defines the header structure, sends the command via `write`, gets the result via `read` and does some (limited) error checking. The sense buffer data is available in the output buffer (unless a NULL pointer has been given, in which case it's in the input buffer). We will use it in the examples which follow.

Note: Set the value of `DEVICE` to your device descriptor.

> `

>     #define DEVICE "/dev/sgc"

>     /* Example program to demonstrate the generic SCSI interface */
>     #include <stdio.h>
>     #include <unistd.h>
>     #include <string.h>
>     #include <fcntl.h>
>     #include <errno.h>
>     #include <scsi/sg.h>

>     #define SCSI_OFF sizeof(struct sg_header)
>     static unsigned char cmd[SCSI_OFF + 18];      /* SCSI command buffer */
>     int fd;                               /* SCSI device/file descriptor */

>     /* process a complete SCSI cmd. Use the generic SCSI interface. */
>     static int handle_SCSI_cmd(unsigned cmd_len,         /* command length */
>                                unsigned in_size,         /* input data size */
>                                unsigned char *i_buff,    /* input buffer */
>                                unsigned out_size,        /* output data size */
>                                unsigned char *o_buff     /* output buffer */
>                                )
>     {
>         int status = 0;
>         struct sg_header *sg_hd;

>         /* safety checks */
>         if (!cmd_len) return -1;            /* need a cmd_len != 0 */
>         if (!i_buff) return -1;             /* need an input buffer != NULL */
>     #ifdef SG_BIG_BUFF
>         if (SCSI_OFF + cmd_len + in_size > SG_BIG_BUFF) return -1;
>         if (SCSI_OFF + out_size > SG_BIG_BUFF) return -1;
>     #else
>         if (SCSI_OFF + cmd_len + in_size > 4096) return -1;
>         if (SCSI_OFF + out_size > 4096) return -1;
>     #endif

>         if (!o_buff) out_size = 0;      /* no output buffer, no output size */

>         /* generic SCSI device header construction */
>         sg_hd = (struct sg_header *) i_buff;
>         sg_hd->reply_len   = SCSI_OFF + out_size;
>         sg_hd->twelve_byte = cmd_len == 12;
>         sg_hd->result = 0;
>     #if     0
>         sg_hd->pack_len    = SCSI_OFF + cmd_len + in_size; /* not necessary */
>         sg_hd->pack_id;     /* not used */
>         sg_hd->other_flags; /* not used */
>     #endif

>         /* send command */
>         status = write( fd, i_buff, SCSI_OFF + cmd_len + in_size );
>         if ( status < 0 || status != SCSI_OFF + cmd_len + in_size ||
>                            sg_hd->result ) {
>             /* some error happened */
>             fprintf( stderr, "write(generic) result = 0x%x cmd = 0x%x\n",
>                         sg_hd->result, i_buff[SCSI_OFF] );
>             perror("");
>             return status;
>         }

>         if (!o_buff) o_buff = i_buff;       /* buffer pointer check */

>         /* retrieve result */
>         status = read( fd, o_buff, SCSI_OFF + out_size);
>         if ( status < 0 || status != SCSI_OFF + out_size || sg_hd->result ) {
>             /* some error happened */
>             fprintf( stderr, "read(generic) status = 0x%x, result = 0x%x, "
>                              "cmd = 0x%x\n",
>                              status, sg_hd->result, o_buff[SCSI_OFF] );
>             fprintf( stderr, "read(generic) sense "
>                     "%x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x\n",
>                     sg_hd->sense_buffer[0],         sg_hd->sense_buffer[1],
>                     sg_hd->sense_buffer[2],         sg_hd->sense_buffer[3],
>                     sg_hd->sense_buffer[4],         sg_hd->sense_buffer[5],
>                     sg_hd->sense_buffer[6],         sg_hd->sense_buffer[7],
>                     sg_hd->sense_buffer[8],         sg_hd->sense_buffer[9],
>                     sg_hd->sense_buffer[10],        sg_hd->sense_buffer[11],
>                     sg_hd->sense_buffer[12],        sg_hd->sense_buffer[13],
>                     sg_hd->sense_buffer[14],        sg_hd->sense_buffer[15]);
>             if (status < 0)
>                 perror("");
>         }
>         /* Look if we got what we expected to get */
>         if (status == SCSI_OFF + out_size) status = 0; /* got them all */

>         return status;  /* 0 means no error */
>     }

> `

While this may look somewhat complex at first appearance, most of the code is for error checking and reporting (which is useful even after the code is working).

`Handle_SCSI_cmd` has a generalized form for all SCSI commands types, falling into each of these categories:

> `

>            Data Mode              | Example Command
>     ===============================================
>     neither input nor output data | test unit ready
>      no input data, output data   | inquiry, read
>      input data, no output data   | mode select, write
>        input data, output data    | mode sense

> `

## 9. Inquiry Command Example

One of the most basic SCSI commands is the `INQUIRY` command, used to identify the type and make of the device. Here is the definition from the SCSI-2 specification (for details refer to the SCSI-2 standard).

> `

>                                 Table 44: INQUIRY Command
>     +=====-========-========-========-========-========-========-========-========+
>     |  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
>     |Byte |        |        |        |        |        |        |        |        |
>     |=====+=======================================================================|
>     | 0   |                           Operation Code (12h)                        |
>     |-----+-----------------------------------------------------------------------|
>     | 1   | Logical Unit Number      |                  Reserved         |  EVPD  |
>     |-----+-----------------------------------------------------------------------|
>     | 2   |                           Page Code                                   |
>     |-----+-----------------------------------------------------------------------|
>     | 3   |                           Reserved                                    |
>     |-----+-----------------------------------------------------------------------|
>     | 4   |                           Allocation Length                           |
>     |-----+-----------------------------------------------------------------------|
>     | 5   |                           Control                                     |
>     +=============================================================================+

> `

The output data are as follows:

> `

>                          Table 45: Standard INQUIRY Data Format
>     +=====-========-========-========-========-========-========-========-========+
>     |  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
>     |Byte |        |        |        |        |        |        |        |        |
>     |=====+==========================+============================================|
>     | 0   | Peripheral Qualifier     |           Peripheral Device Type           |
>     |-----+-----------------------------------------------------------------------|
>     | 1   |  RMB   |                  Device-Type Modifier                        |
>     |-----+-----------------------------------------------------------------------|
>     | 2   |   ISO Version   |       ECMA Version       |  ANSI-Approved Version   |
>     |-----+-----------------+-----------------------------------------------------|
>     | 3   |  AENC  | TrmIOP |     Reserved    |         Response Data Format      |
>     |-----+-----------------------------------------------------------------------|
>     | 4   |                           Additional Length (n-4)                     |
>     |-----+-----------------------------------------------------------------------|
>     | 5   |                           Reserved                                    |
>     |-----+-----------------------------------------------------------------------|
>     | 6   |                           Reserved                                    |
>     |-----+-----------------------------------------------------------------------|
>     | 7   | RelAdr | WBus32 | WBus16 |  Sync  | Linked |Reserved| CmdQue | SftRe  |
>     |-----+-----------------------------------------------------------------------|
>     | 8   | (MSB)                                                                 |
>     |- - -+---                        Vendor Identification                    ---|
>     | 15  |                                                                 (LSB) |
>     |-----+-----------------------------------------------------------------------|
>     | 16  | (MSB)                                                                 |
>     |- - -+---                        Product Identification                   ---|
>     | 31  |                                                                 (LSB) |
>     |-----+-----------------------------------------------------------------------|
>     | 32  | (MSB)                                                                 |
>     |- - -+---                        Product Revision Level                   ---|
>     | 35  |                                                                 (LSB) |
>     |-----+-----------------------------------------------------------------------|
>     | 36  |                                                                       |
>     |- - -+---                        Vendor Specific                          ---|
>     | 55  |                                                                       |
>     |-----+-----------------------------------------------------------------------|
>     | 56  |                                                                       |
>     |- - -+---                        Reserved                                 ---|
>     | 95  |                                                                       |
>     |=====+=======================================================================|
>     |     |                       Vendor-Specific Parameters                      |
>     |=====+=======================================================================|
>     | 96  |                                                                       |
>     |- - -+---                        Vendor Specific                          ---|
>     | n   |                                                                       |
>     +=============================================================================+

> `

The next example uses the low-level function `handle_SCSI_cmd` to perform the Inquiry SCSI command.

We first append the command block to the generic header, then call `handle_SCSI_cmd`. Note that the output buffer size argument for the `handle_SCSI_cmd` call excludes the generic header size. After command completion the output buffer contains the requested data, unless an error occurred.

> `

>     #define INQUIRY_CMD     0x12
>     #define INQUIRY_CMDLEN  6
>     #define INQUIRY_REPLY_LEN 96
>     #define INQUIRY_VENDOR  8       /* Offset in reply data to vendor name */

>     /* request vendor brand and model */
>     static unsigned char *Inquiry ( void )
>     {
>       unsigned char Inqbuffer[ SCSI_OFF + INQUIRY_REPLY_LEN ];
>       unsigned char cmdblk [ INQUIRY_CMDLEN ] =
>           { INQUIRY_CMD,  /* command */
>                       0,  /* lun/reserved */
>                       0,  /* page code */
>                       0,  /* reserved */
>       INQUIRY_REPLY_LEN,  /* allocation length */
>                       0 };/* reserved/flag/link */

>       memcpy( cmd + SCSI_OFF, cmdblk, sizeof(cmdblk) );

>       /*
>        * +------------------+
>        * | struct sg_header | <- cmd
>        * +------------------+
>        * | copy of cmdblk   | <- cmd + SCSI_OFF
>        * +------------------+
>        */

>       if (handle_SCSI_cmd(sizeof(cmdblk), 0, cmd,
>                           sizeof(Inqbuffer) - SCSI_OFF, Inqbuffer )) {
>           fprintf( stderr, "Inquiry failed\n" );
>           exit(2);
>       }
>       return (Inqbuffer + SCSI_OFF);
>     }

> `

The example above follows this structure. The Inquiry function copies its command block behind the generic header (given by `SCSI_OFF`). Input data is not present for this command. `Handle_SCSI_cmd` will define the header structure. We can now implement the function `main` to complete this working example program.

> `

>     void main( void )
>     {
>       fd = open(DEVICE, O_RDWR);
>       if (fd < 0) {
>         fprintf( stderr, "Need read/write permissions for "DEVICE".\n" );
>         exit(1);
>       }

>       /* print some fields of the Inquiry result */
>       printf( "%s\n", Inquiry() + INQUIRY_VENDOR );
>     }

> `

We first open the device, check for errors, and then call the higher level subroutine. Then we print the results in human readable format including the vendor, product, and revision.

Note: There is more information in the Inquiry result than this little program gives. You may want to extend the program to give device type, ANSI version etc. The device type is of special importance, since it determines the mandatory and optional command sets for this device. If you don't want to program it yourself, you may want to use the scsiinfo program from Eric Youngdale, which requests nearly all information about an SCSI device. Look at tsx-11.mit.edu in pub/Linux/ALPHA/scsi.

## 10. The Sense Buffer

Commands with no output data can give status information via the sense buffer (which is part of the header structure). Sense data is available when the previous command has terminated with a CHECK CONDITION status. In this case the kernel automatically retrieves the sense data via a REQUEST SENSE command. Its structure is:

> `

>     +=====-========-========-========-========-========-========-========-========+
>     |  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
>     |Byte |        |        |        |        |        |        |        |        |
>     |=====+========+==============================================================|
>     | 0   | Valid  |                  Error Code (70h or 71h)                     |
>     |-----+-----------------------------------------------------------------------|
>     | 1   |                           Segment Number                              |
>     |-----+-----------------------------------------------------------------------|
>     | 2   |Filemark|  EOM   |  ILI   |Reserved|         Sense Key                 |
>     |-----+-----------------------------------------------------------------------|
>     | 3   | (MSB)                                                                 |
>     |- - -+---                        Information                              ---|
>     | 6   |                                                                 (LSB) |
>     |-----+-----------------------------------------------------------------------|
>     | 7   |                           Additional Sense Length (n-7)               |
>     |-----+-----------------------------------------------------------------------|
>     | 8   | (MSB)                                                                 |
>     |- - -+---                        Command-Specific Information             ---|
>     | 11  |                                                                 (LSB) |
>     |-----+-----------------------------------------------------------------------|
>     | 12  |                           Additional Sense Code                       |
>     |-----+-----------------------------------------------------------------------|
>     | 13  |                           Additional Sense Code Qualifier             |
>     |-----+-----------------------------------------------------------------------|
>     | 14  |                           Field Replaceable Unit Code                 |
>     |-----+-----------------------------------------------------------------------|
>     | 15  |  SKSV  |                                                              |
>     |- - -+------------               Sense-Key Specific                       ---|
>     | 17  |                                                                       |
>     |-----+-----------------------------------------------------------------------|
>     | 18  |                                                                       |
>     |- - -+---                        Additional Sense Bytes                   ---|
>     | n   |                                                                       |
>     +=============================================================================+

> `

Note: The most useful fields are Sense Key (see section sec-sensekeys ), Additional Sense Code and Additional Sense Code Qualifier (see section sec-sensecodes ). The latter two are used combined as a pair.

## 11. Example Using Sense Buffer

Here we will use the TEST UNIT READY command to check whether media is loaded into our device. The header declarations and function `handle_SCSI_cmd` from the inquiry example will be needed as well.

> `

>                             Table 73: TEST UNIT READY Command
>     +=====-========-========-========-========-========-========-========-========+
>     |  Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
>     |Byte |        |        |        |        |        |        |        |        |
>     |=====+=======================================================================|
>     | 0   |                           Operation Code (00h)                        |
>     |-----+-----------------------------------------------------------------------|
>     | 1   | Logical Unit Number      |                  Reserved                  |
>     |-----+-----------------------------------------------------------------------|
>     | 2   |                           Reserved                                    |
>     |-----+-----------------------------------------------------------------------|
>     | 3   |                           Reserved                                    |
>     |-----+-----------------------------------------------------------------------|
>     | 4   |                           Reserved                                    |
>     |-----+-----------------------------------------------------------------------|
>     | 5   |                           Control                                     |
>     +=============================================================================+

> `

Here is the function which implements it:

> `

>     #define TESTUNITREADY_CMD 0
>     #define TESTUNITREADY_CMDLEN 6

>     #define ADD_SENSECODE 12
>     #define ADD_SC_QUALIFIER 13
>     #define NO_MEDIA_SC 0x3a
>     #define NO_MEDIA_SCQ 0x00

>     int TestForMedium ( void )
>     {
>       /* request READY status */
>       static unsigned char cmdblk [TESTUNITREADY_CMDLEN] = {
>           TESTUNITREADY_CMD, /* command */
>                           0, /* lun/reserved */
>                           0, /* reserved */
>                           0, /* reserved */
>                           0, /* reserved */
>                           0};/* control */

>       memcpy( cmd + SCSI_OFF, cmdblk, sizeof(cmdblk) );

>       /*
>        * +------------------+
>        * | struct sg_header | <- cmd
>        * +------------------+
>        * | copy of cmdblk   | <- cmd + SCSI_OFF
>        * +------------------+
>        */

>       if (handle_SCSI_cmd(sizeof(cmdblk), 0, cmd,
>                                 0, NULL)) {
>           fprintf (stderr, "Test unit ready failed\n");
>           exit(2);
>       }

>       return
>        *(((struct sg_header*)cmd)->sense_buffer +ADD_SENSECODE) !=
>                                                             NO_MEDIA_SC ||
>        *(((struct sg_header*)cmd)->sense_buffer +ADD_SC_QUALIFIER) !=
>                                                             NO_MEDIA_SCQ;
>     }

> `

Combined with this `main` function we can do the check.

> `

>     void main( void )
>     {
>       fd = open(DEVICE, O_RDWR);
>       if (fd < 0) {
>         fprintf( stderr, "Need read/write permissions for "DEVICE".\n" );
>         exit(1);
>       }

>       /* look if medium is loaded */

>       if (!TestForMedium()) {
>         printf("device is unloaded\n");
>       } else {
>         printf("device is loaded\n");
>       }
>     }

> `

The file `generic_demo.c` from the appendix contains both examples.

## 12. Ioctl Functions

There are two ioctl functions available:

- `ioctl(fd, SG_SET_TIMEOUT, &Timeout);` sets the timeout value to `Timeout` * 10 milliseconds. `Timeout` has to be declared as int.
- `ioctl(fd, SG_GET_TIMEOUT, &Timeout);` gets the current timeout value. `Timeout` has to be declared as int.

## 13. Driver Defaults

## 13.1 Transfer Lengths

Currently (at least up to kernel version 1.1.68) input and output sizes have to be less than or equal than 4096 bytes unless the kernel has been compiled with `SG_BIG_BUFF` defined, if which case it is limited to `SG_BIG_BUFF` (e.g. 32768) bytes. These sizes include the generic header as well as the command block on input. `SG_BIG_BUFF` can be safely increased upto (131072 - 512). To take advantage of this, a new kernel has to be compiled and booted, of course.

## 13.2 Timeout And Retry Values

The default timeout value is set to one minute (`Timeout` = 6000). It can be changed through an ioctl call (see section sec-ioctl ). The default number of retries is one.

## 14. Obtaining The Scsi Specifications

There are standards entitled SCSI-1 and SCSI-2 (and possibly soon SCSI-3). The standards are mostly upward compatible.

The SCSI-1 standard is (in the author's opinion) mostly obsolete, and SCSI-2 is the most widely used. SCSI-3 is very new and very expensive. These standardized command sets specify mandatory and optional commands for SCSI manufacturers and should be preferred over the vendor specific command extensions which are not standardized and for which programming information is seldom available. Of course sometimes there is no alternative to these extensions.

Electronic copies of the latest drafts are available via anonymous ftp from:

- ftp.cs.tulane.edu:pub/scsi
- ftp.symbios.com:/pub/standards
- ftp.cs.uni-sb.de:/pub/misc/doc/scsi

(I got my SCSI specification from the Yggdrasil Linux CD-ROM in the directory /usr/doc/scsi-2 and /usr/doc/scsi-1).

The SCSI FAQ also lists the following sources of printed information:

The SCSI specification: Available from:

> `

>           Global Engineering Documents
>           15 Inverness Way East
>           Englewood Co  80112-5704
>           (800) 854-7179
>             SCSI-1: X3.131-1986
>             SCSI-2: X3.131-199x
>             SCSI-3 X3T9.2/91-010R4 Working Draft

>     (Global Engineering Documentation in Irvine, CA (714)261-1455??)

>     SCSI-1: Doc \# X3.131-1986 from ANSI, 1430 Broadway, NY, NY 10018

>     IN-DEPTH EXPLORATION OF SCSI can be obtained from
>     Solution Technology, Attn: SCSI Publications, POB 104, Boulder Creek,
>     CA 95006, (408)338-4285, FAX (408)338-4374

>     THE SCSI ENCYLOPEDIA and the SCSI BENCH REFERENCE can be obtained from
>     ENDL Publishing, 14426 Black Walnut Ct., Saratoga, CA 95090,
>     (408)867-6642, FAX (408)867-2115

>     SCSI: UNDERSTANDING THE SMALL COMPUTER SYSTEM INTERFACE was published
>     by Prentice-Hall, ISBN 0-13-796855-8

> `

## 15. Related Information Sources

## 15.1 HOWTOs and FAQs

The Linux SCSI-HOWTO by Drew Eckhardt covers all supported SCSI controllers as well as device specific questions. A lot of troubleshooting hints are given. It is available from sunsite.unc.edu in /pub/Linux/docs/LDP and its mirror sites.

General questions about SCSI are answered in the SCSI-FAQ from the newsgroup Comp.Periphs.Scsi (available on tsx-11 in pub/linux/ALPHA/scsi and mirror sites).

## 15.2 Mailing list

There is a mailing list for bug reports and questions regarding SCSI development under Linux. To join, send email to `majordomo@vger.rutgers.edu` with the line `subscribe linux-scsi` in the body of the message. Messages should be posted to `linux-scsi@vger.rutgers.edu`. Help text can be requested by sending the message line "help" to `majordomo@vger.rutgers.edu`.

## 15.3 Example code

sunsite.unc.edu: apps/graphics/hpscanpbm-0.3a.tar.gz

  This package handles a HP scanjet scanner through the generic interface.

tsx-11.mit.edu: BETA/cdrom/private/mkisofs/cdwrite-1.3.tar.gz

  The cdwrite package uses the generic interface to write a cd image to a cd writer.

sunsite.unc.edu: apps/sound/cds/cdda2wav*.src.tar.gz

  A shameless plug for my own application, which copies audio cd tracks into wav files.

## 16. Other useful stuff

Things that may come in handy. I don't have no idea if there are newer or better versions around. Feedback is welcome.

## 16.1 Device driver writer helpers

These documents can be found at the sunsite.unc.edu ftp server and its mirrors.

/pub/Linux/docs/kernel/kernel-hackers-guide

  The LDP kernel hackers guide. May be a bit outdated, but covers the most fundamental things.

/pub/Linux/docs/kernel/drivers.doc.z

  This document covers writing character drivers.

/pub/Linux/docs/kernel/tutorial.doc.z

  Tutorial on writing a character device driver with code.

/pub/Linux/docs/kernel/scsi.paper.tar.gz

  A Latex document describing howto write a SCSI driver.

/pub/Linux/docs/hardware/DEVICES

  A list of device majors and minors used by Linux.

## 16.2 Utilities

tsx-11.mit.edu: ALPHA/scsi/scsiinfo*.tar.gz

  Program to query a scsi device for operating parameters, defect lists, etc. An X-based interface is available which requires you have Tk/Tcl/wish installed. With the X-based interface you can easily alter the settings on the drive.

tsx-11.mit.edu: ALPHA/kdebug

  A gdb extension for kernel debugging.

## 17. Other SCSI Access Interfaces

In Linux there is also another SCSI access method via SCSI_IOCTL_SEND_COMMAND ioctl calls, which is deprecated. Special tools like 'scsiinfo' utilize it.

There are some other similar interfaces in use in the un*x world, but not available for Linux:

1. CAM (Common Access Method) developed by Future Domain and other SCSI vendors. Linux has little support for a SCSI CAM system yet (mainly for booting from hard disk). CAM even supports target mode, so one could disguise ones computer as a peripheral hardware device (e.g. for a small SCSI net).
2. ASPI (Advanced SCSI Programming Interface) developed by Adaptec. This is the de facto standard for MS-DOS machines.

There are other application interfaces from SCO(TM), NeXT(TM), Silicon Graphics(TM) and SUN(TM) as well.

## 18. Final Comments

The generic SCSI interface bridges the gap between user applications and specific devices. But rather than bloating a lot of programs with similar sets of low-level functions, it would be more desirable to have a shared library with a generalized set of low-level functions for a particular purpose. The main goal should be to have independent layers of interfaces. A good design would separate an application into low-level and hardware independent routines. The low-level routines could be put into a shared library and made available for all applications. Here, standardized interfaces should be followed as much as possible before making new ones.

By now you should know more than I do about the Linux generic SCSI interface. So you can start developing powerful applications for the benefit of the global Linux community now...

## 19. Acknowledgments

Special thanks go to Jeff Tranter for proofreading and enhancing the text considerably as well as to Carlos Puchol for useful comments. Drew Eckhardt's and Eric Youngdale's help on my first (dumb) questions about the use of this interface has been appreciated.

## 20. Appendix

## 21. Error handling

The functions `open`, `ioctl`, `write` and `read` can report errors. In this case their return value is -1 and the global variable errno is set to the error number. The errno values are defined in `/usr/include/errno.h`. Possible values are:

> `

>     Function | Error        | Description
>     =========|==============|=============================================
>     open     | ENXIO        | not a valid device
>              | EACCES       | access mode is not read/write (O_RDWR)
>              | EBUSY        | device was requested for nonblocking access,
>              |              | but is busy now.
>              | ERESTARTSYS  | this indicates an internal error. Try to
>              |              | make it reproducible and inform the SCSI
>              |              | channel (for details on bug reporting
>              |              | see Drew Eckhardts SCSI-HOWTO).
>     ioctl    | ENXIO        | not a valid device
>     read     | EAGAIN       | the device would block. Try again later.
>              | ERESTARTSYS  | this indicates an internal error. Try to
>              |              | make it reproducible and inform the SCSI
>              |              | channel (for details on bug reporting
>              |              | see Drew Eckhardts SCSI-HOWTO).
>     write    | EIO          | the length is too small (smaller than the
>              |              | generic header struct). Caution: Currently
>              |              | there is no overlength checking.
>              | EAGAIN       | the device would block. Try again later.
>              | ENOMEM       | memory required for this request could not be
>              |              | allocated. Try later again unless you
>              |              | exceeded the maximum transfer size (see above)
>     select   |              | none
>     close    |              | none

> `

For read/write positive return values indicate as usual the amount of bytes that have been successfully transferred. This should equal the amount you requested.

## 21.1 Error status decoding

Furthermore a detailed reporting is done via the kernels `hd_status` and the devices `sense_buffer` (see section sec-sensebuff ) both from the generic header structure.

The meaning of `hd_status` can be found in `drivers/scsi/scsi.h`: This `unsigned int` is composed out of different parts:

> `

>       lsb  |    ...    |    ...    | msb
>     =======|===========|===========|============
>     status | sense key | host code | driver byte

> `

These macros from `drivers/scsi/scsi.h` are available, but unfortunately cannot be easily used due to weird header file interdependencies. This has to be cleaned.

> `

>             Macro          | Description
>     =======================|=================================================
>     status_byte(hd_status) | The SCSI device status. See section Status codes
>     msg_byte(hd_status)    | From the device. See section SCSI sense keys
>     host_byte(hd_status)   | From the kernel. See section Hostcodes
>     driver_byte(hd_status) | From the kernel. See section midlevel codes

> `

## 21.2 Status codes

The following status codes from the SCSI device (defined in `scsi/scsi.h`) are available.

> `

>     Value | Symbol
>     ======|=====================
>     0x00  | GOOD
>     0x01  | CHECK_CONDITION
>     0x02  | CONDITION_GOOD
>     0x04  | BUSY
>     0x08  | INTERMEDIATE_GOOD
>     0x0a  | INTERMEDIATE_C_GOOD
>     0x0c  | RESERVATION_CONFLICT

> `

Note that these symbol values have been shifted right once. When the status is CHECK_CONDITION, the sense data in the sense buffer is valid (check especially the additional sense code and additional sense code qualifier).

These values carry the meaning from the SCSI-2 specification:

> `

>                                Table 27: Status Byte Code
>     +=================================-==============================+
>     |       Bits of Status Byte       |  Status                      |
>     |  7   6   5   4   3   2   1   0  |                              |
>     |---------------------------------+------------------------------|
>     |  R   R   0   0   0   0   0   R  |  GOOD                        |
>     |  R   R   0   0   0   0   1   R  |  CHECK CONDITION             |
>     |  R   R   0   0   0   1   0   R  |  CONDITION MET               |
>     |  R   R   0   0   1   0   0   R  |  BUSY                        |
>     |  R   R   0   1   0   0   0   R  |  INTERMEDIATE                |
>     |  R   R   0   1   0   1   0   R  |  INTERMEDIATE-CONDITION MET  |
>     |  R   R   0   1   1   0   0   R  |  RESERVATION CONFLICT        |
>     |  R   R   1   0   0   0   1   R  |  COMMAND TERMINATED          |
>     |  R   R   1   0   1   0   0   R  |  QUEUE FULL                  |
>     |                                 |                              |
>     |       All Other Codes           |  Reserved                    |
>     |----------------------------------------------------------------|
>     |  Key: R = Reserved bit                                         |
>     +================================================================+

>     A definition of the status byte codes is given below.

>     GOOD.  This status indicates that the target has successfully completed the
>     command.

>     CHECK CONDITION.  This status indicates that a contingent allegiance condition
>     has occurred (see 6.6).

>     CONDITION MET.  This status or INTERMEDIATE-CONDITION MET is returned whenever
>     the requested operation is satisfied (see the SEARCH DATA and PRE-FETCH
>     commands).

>     BUSY.  This status indicates that the target is busy.  This status shall be
>     returned whenever a target is unable to accept a command from an otherwise
>     acceptable initiator (i.e., no reservation conflicts).  The recommended
>     initiator recovery action is to issue the command again at a later time.

>     INTERMEDIATE.  This status or INTERMEDIATE-CONDITION MET shall be returned for
>     every successfully completed command in a series of linked commands (except
>     the last command), unless the command is terminated with CHECK CONDITION,
>     RESERVATION CONFLICT, or COMMAND TERMINATED status.  If INTERMEDIATE or
>     INTERMEDIATE-CONDITION MET status is not returned, the series of linked
>     commands is terminated and the I/O process is ended.

>     INTERMEDIATE-CONDITION MET.  This status is the combination of the CONDITION
>     MET and INTERMEDIATE statuses.

>     RESERVATION CONFLICT.  This status shall be returned whenever an initiator
>     attempts to access a logical unit or an extent within a logical unit that is
>     reserved with a conflicting reservation type for another SCSI device (see the
>     RESERVE and RESERVE UNIT commands).  The recommended initiator recovery action
>     is to issue the command again at a later time.

>     COMMAND TERMINATED.  This status shall be returned whenever the target
>     terminates the current I/O process after receiving a TERMINATE I/O PROCESS
>     message (see 5.6.22).  This status also indicates that a contingent allegiance
>     condition has occurred (see 6.6).

>     QUEUE FULL.  This status shall be implemented if tagged queuing is
>     implemented.  This status is returned when a SIMPLE QUEUE TAG, ORDERED QUEUE
>     TAG, or HEAD OF QUEUE TAG message is received and the command queue is full.
>     The I/O process is not placed in the command queue.

> `

## 21.3 SCSI Sense Keys

These kernel symbols (from `scsi/scsi.h`) are predefined:

> `

>     Value | Symbol
>     ======|================
>     0x00  | NO_SENSE
>     0x01  | RECOVERED_ERROR
>     0x02  | NOT_READY
>     0x03  | MEDIUM_ERROR
>     0x04  | HARDWARE_ERROR
>     0x05  | ILLEGAL_REQUEST
>     0x06  | UNIT_ATTENTION
>     0x07  | DATA_PROTECT
>     0x08  | BLANK_CHECK
>     0x0a  | COPY_ABORTED
>     0x0b  | ABORTED_COMMAND
>     0x0d  | VOLUME_OVERFLOW
>     0x0e  | MISCOMPARE

> `

A verbatim list from the SCSI-2 doc follows (from section 7.2.14.3):

> `

>                         Table 69: Sense Key (0h-7h) Descriptions
>     +========-====================================================================+
>     | Sense  |  Description                                                       |
>     |  Key   |                                                                    |
>     |--------+--------------------------------------------------------------------|
>     |   0h   |  NO SENSE.  Indicates that there is no specific sense key          |
>     |        |  information to be reported for the designated logical unit.  This |
>     |        |  would be the case for a successful command or a command that      |
>     |        |  received CHECK CONDITION or COMMAND TERMINATED status because one |
>     |        |  of the filemark, EOM, or ILI bits is set to one.                  |
>     |--------+--------------------------------------------------------------------|
>     |   1h   |  RECOVERED ERROR.  Indicates that the last command completed       |
>     |        |  successfully with some recovery action performed by the target.   |
>     |        |  Details may be determinable by examining the additional sense     |
>     |        |  bytes and the information field.  When multiple recovered errors  |
>     |        |  occur during one command, the choice of which error to report     |
>     |        |  (first, last, most severe, etc.) is device specific.              |
>     |--------+--------------------------------------------------------------------|
>     |   2h   |  NOT READY.  Indicates that the logical unit addressed cannot be   |
>     |        |  accessed.  Operator intervention may be required to correct this  |
>     |        |  condition.                                                        |
>     |--------+--------------------------------------------------------------------|
>     |   3h   |  MEDIUM ERROR.  Indicates that the command terminated with a non-  |
>     |        |  recovered error condition that was probably caused by a flaw in   |
>     |        |  the medium or an error in the recorded data.  This sense key may  |
>     |        |  also be returned if the target is unable to distinguish between a |
>     |        |  flaw in the medium and a specific hardware failure (sense key 4h).|
>     |--------+--------------------------------------------------------------------|
>     |   4h   |  HARDWARE ERROR.  Indicates that the target detected a non-        |
>     |        |  recoverable hardware failure (for example, controller failure,    |
>     |        |  device failure, parity error, etc.) while performing the command  |
>     |        |  or during a self test.                                            |
>     |--------+--------------------------------------------------------------------|
>     |   5h   |  ILLEGAL REQUEST.  Indicates that there was an illegal parameter in|
>     |        |  the command descriptor block or in the additional parameters      |
>     |        |  supplied as data for some commands (FORMAT UNIT, SEARCH DATA,     |
>     |        |  etc.).  If the target detects an invalid parameter in the command |
>     |        |  descriptor block, then it shall terminate the command without     |
>     |        |  altering the medium.  If the target detects an invalid parameter  |
>     |        |  in the additional parameters supplied as data, then the target may|
>     |        |  have already altered the medium.  This sense key may also indicate|
>     |        |  that an invalid IDENTIFY message was received (5.6.7).            |
>     |--------+--------------------------------------------------------------------|
>     |   6h   |  UNIT ATTENTION.  Indicates that the removable medium may have been|
>     |        |  changed or the target has been reset.  See 6.9 for more detailed  |
>     |        |  information about the unit attention condition.                   |
>     |--------+--------------------------------------------------------------------|
>     |   7h   |  DATA PROTECT.  Indicates that a command that reads or writes the  |
>     |        |  medium was attempted on a block that is protected from this       |
>     |        |  operation.  The read or write operation is not performed.         |
>     +=============================================================================+

>                         Table 70: Sense Key (8h-Fh) Descriptions
>     +========-====================================================================+
>     | Sense  |  Description                                                       |
>     |  Key   |                                                                    |
>     |--------+--------------------------------------------------------------------|
>     |   8h   |  BLANK CHECK.  Indicates that a write-once device or a sequential- |
>     |        |  access device encountered blank medium or format-defined end-of-  |
>     |        |  data indication while reading or a write-once device encountered a|
>     |        |  non-blank medium while writing.                                   |
>     |--------+--------------------------------------------------------------------|
>     |   9h   |  Vendor Specific.  This sense key is available for reporting vendor|
>     |        |  specific conditions.                                              |
>     |--------+--------------------------------------------------------------------|
>     |   Ah   |  COPY ABORTED.  Indicates a COPY, COMPARE, or COPY AND VERIFY      |
>     |        |  command was aborted due to an error condition on the source       |
>     |        |  device, the destination device, or both.  (See 7.2.3.2 for        |
>     |        |  additional information about this sense key.)                     |
>     |--------+--------------------------------------------------------------------|
>     |   Bh   |  ABORTED COMMAND.  Indicates that the target aborted the command.  |
>     |        |  The initiator may be able to recover by trying the command again. |
>     |--------+--------------------------------------------------------------------|
>     |   Ch   |  EQUAL.  Indicates a SEARCH DATA command has satisfied an equal    |
>     |        |  comparison.                                                       |
>     |--------+--------------------------------------------------------------------|
>     |   Dh   |  VOLUME OVERFLOW.  Indicates that a buffered peripheral device has |
>     |        |  reached the end-of-partition and data may remain in the buffer    |
>     |        |  that has not been written to the medium.  A RECOVER BUFFERED DATA |
>     |        |  command(s) may be issued to read the unwritten data from the      |
>     |        |  buffer.                                                           |
>     |--------+--------------------------------------------------------------------|
>     |   Eh   |  MISCOMPARE.  Indicates that the source data did not match the data|
>     |        |  read from the medium.                                             |
>     |--------+--------------------------------------------------------------------|
>     |   Fh   |  RESERVED.                                                         |
>     +=============================================================================+

> `

## 21.4 Host codes

The following host codes are defined in `drivers/scsi/scsi.h`. They are set by the kernel driver.

> `

>     Value | Symbol         | Description
>     ======|================|========================================
>     0x00  | DID_OK         | No error
>     0x01  | DID_NO_CONNECT | Couldn't connect before timeout period
>     0x02  | DID_BUS_BUSY   | BUS stayed busy through time out period
>     0x03  | DID_TIME_OUT   | TIMED OUT for other reason
>     0x04  | DID_BAD_TARGET | BAD target
>     0x05  | DID_ABORT      | Told to abort for some other reason
>     0x06  | DID_PARITY     | Parity error
>     0x07  | DID_ERROR      | internal error
>     0x08  | DID_RESET      | Reset by somebody
>     0x09  | DID_BAD_INTR   | Got an interrupt we weren't expecting

> `

## 21.5 Driver codes

The midlevel driver categorizes the returned status from the lowlevel driver based on the sense key from the device. It suggests some actions to be taken such as retry, abort or remap. The routine scsi_done from scsi.c does a very differentiated handling based on host_byte(), status_byte(), msg_byte() and the suggestion. It then sets the driver byte to show what it has done. The driver byte is composed out of two nibbles: the driver status and the suggestion. Each half is composed from the below values being 'or'ed together (found in scsi.h).

> `

>     Value | Symbol         | Description of Driver status
>     ======|================|========================================
>     0x00  | DRIVER_OK      | No error
>     0x01  | DRIVER_BUSY    | not used
>     0x02  | DRIVER_SOFT    | not used
>     0x03  | DRIVER_MEDIA   | not used
>     0x04  | DRIVER_ERROR   | internal driver error
>     0x05  | DRIVER_INVALID | finished (DID_BAD_TARGET or DID_ABORT)
>     0x06  | DRIVER_TIMEOUT | finished with timeout
>     0x07  | DRIVER_HARD    | finished with fatal error
>     0x08  | DRIVER_SENSE   | had sense information available

> `

> `

>     Value | Symbol         | Description of suggestion
>     ======|================|========================================
>     0x10  | SUGGEST_RETRY  | retry the SCSI request
>     0x20  | SUGGEST_ABORT  | abort the request
>     0x30  | SUGGEST_REMAP  | remap the block (not yet implemented)
>     0x40  | SUGGEST_DIE    | let the kernel panic
>     0x80  | SUGGEST_SENSE  | get sense information from the device
>     0xff  | SUGGEST_IS_OK  | nothing to be done

> `

## 22. Additional sense codes and additional sense code qualifiers

When the status of the executed SCSI command is CHECK_CONDITION, sense data is available in the sense buffer. The additional sense code and additional sense code qualifier are contained in that buffer.

From the SCSI-2 specification I include two tables. The first is in lexical, the second in numerical order.

## 22.1 ASC and ASCQ in lexical order

The following table list gives a list of descriptions and device types they apply to.

> `

>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                                          |
>     |           .T - SEQUENTIAL ACCESS DEVICE                                     |
>     |           . L - PRINTER DEVICE                                              |
>     |           .  P - PROCESSOR DEVICE                                           |
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE                           |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     | 13h  00h  D   W  O    ADDRESS MARK NOT FOUND FOR DATA FIELD                 |
>     | 12h  00h  D   W  O    ADDRESS MARK NOT FOUND FOR ID FIELD                   |
>     | 00h  11h       R      AUDIO PLAY OPERATION IN PROGRESS                      |
>     | 00h  12h       R      AUDIO PLAY OPERATION PAUSED                           |
>     | 00h  14h       R      AUDIO PLAY OPERATION STOPPED DUE TO ERROR             |
>     | 00h  13h       R      AUDIO PLAY OPERATION SUCCESSFULLY COMPLETED           |
>     | 00h  04h   T    S     BEGINNING-OF-PARTITION/MEDIUM DETECTED                |
>     | 14h  04h   T          BLOCK SEQUENCE ERROR                                  |
>     | 30h  02h  DT  WR O    CANNOT READ MEDIUM - INCOMPATIBLE FORMAT              |
>     | 30h  01h  DT  WR O    CANNOT READ MEDIUM - UNKNOWN FORMAT                   |
>     | 52h  00h   T          CARTRIDGE FAULT                                       |
>     | 3Fh  02h  DTLPWRSOMC  CHANGED OPERATING DEFINITION                          |
>     | 11h  06h      WR O    CIRC UNRECOVERED ERROR                                |
>     | 30h  03h  DT          CLEANING CARTRIDGE INSTALLED                          |
>     | 4Ah  00h  DTLPWRSOMC  COMMAND PHASE ERROR                                   |
>     | 2Ch  00h  DTLPWRSOMC  COMMAND SEQUENCE ERROR                                |
>     | 2Fh  00h  DTLPWRSOMC  COMMANDS CLEARED BY ANOTHER INITIATOR                 |
>     | 2Bh  00h  DTLPWRSO C  COPY CANNOT EXECUTE SINCE HOST CANNOT DISCONNECT      |
>     | 41h  00h  D           DATA PATH FAILURE (SHOULD USE 40 NN)                  |
>     | 4Bh  00h  DTLPWRSOMC  DATA PHASE ERROR                                      |
>     | 11h  07h      W  O    DATA RESYCHRONIZATION ERROR                           |
>     | 16h  00h  D   W  O    DATA SYNCHRONIZATION MARK ERROR                       |
>     | 19h  00h  D      O    DEFECT LIST ERROR                                     |
>     | 19h  03h  D      O    DEFECT LIST ERROR IN GROWN LIST                       |
>     | 19h  02h  D      O    DEFECT LIST ERROR IN PRIMARY LIST                     |
>     | 19h  01h  D      O    DEFECT LIST NOT AVAILABLE                             |
>     | 1Ch  00h  D      O    DEFECT LIST NOT FOUND                                 |
>     | 32h  01h  D   W  O    DEFECT LIST UPDATE FAILURE                            |
>     | 40h  NNh  DTLPWRSOMC  DIAGNOSTIC FAILURE ON COMPONENT NN (80H-FFH)          |
>     | 63h  00h       R      END OF USER AREA ENCOUNTERED ON THIS TRACK            |
>     | 00h  05h   T    S     END-OF-DATA DETECTED                                  |
>     | 14h  03h   T          END-OF-DATA NOT FOUND                                 |
>     | 00h  02h   T    S     END-OF-PARTITION/MEDIUM DETECTED                      |
>     | 51h  00h   T     O    ERASE FAILURE                                         |
>     | 0Ah  00h  DTLPWRSOMC  ERROR LOG OVERFLOW                                    |
>     | 11h  02h  DT  W SO    ERROR TOO LONG TO CORRECT                             |
>     | 03h  02h   T          EXCESSIVE WRITE ERRORS                                |
>     | 3Bh  07h    L         FAILED TO SENSE BOTTOM-OF-FORM                        |
>     | 3Bh  06h    L         FAILED TO SENSE TOP-OF-FORM                           |
>     | 00h  01h   T          FILEMARK DETECTED                                     |
>     | 14h  02h   T          FILEMARK OR SETMARK NOT FOUND                         |
>     | 09h  02h      WR O    FOCUS SERVO FAILURE                                   |
>     | 31h  01h  D L    O    FORMAT COMMAND FAILED                                 |
>     | 58h  00h         O    GENERATION DOES NOT EXIST                             |
>     +=============================================================================+

> `

> `

>     Table 71: (continued)
>     +=============================================================================+
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     | 1Ch  02h  D      O    GROWN DEFECT LIST NOT FOUND                           |
>     | 00h  06h  DTLPWRSOMC  I/O PROCESS TERMINATED                                |
>     | 10h  00h  D   W  O    ID CRC OR ECC ERROR                                   |
>     | 22h  00h  D           ILLEGAL FUNCTION (SHOULD USE 20 00, 24 00, OR 26 00)  |
>     | 64h  00h       R      ILLEGAL MODE FOR THIS TRACK                           |
>     | 28h  01h          M   IMPORT OR EXPORT ELEMENT ACCESSED                     |
>     | 30h  00h  DT  WR OM   INCOMPATIBLE MEDIUM INSTALLED                         |
>     | 11h  08h   T          INCOMPLETE BLOCK READ                                 |
>     | 48h  00h  DTLPWRSOMC  INITIATOR DETECTED ERROR MESSAGE RECEIVED             |
>     | 3Fh  03h  DTLPWRSOMC  INQUIRY DATA HAS CHANGED                              |
>     | 44h  00h  DTLPWRSOMC  INTERNAL TARGET FAILURE                               |
>     | 3Dh  00h  DTLPWRSOMC  INVALID BITS IN IDENTIFY MESSAGE                      |
>     | 2Ch  02h        S     INVALID COMBINATION OF WINDOWS SPECIFIED              |
>     | 20h  00h  DTLPWRSOMC  INVALID COMMAND OPERATION CODE                        |
>     | 21h  01h          M   INVALID ELEMENT ADDRESS                               |
>     | 24h  00h  DTLPWRSOMC  INVALID FIELD IN CDB                                  |
>     | 26h  00h  DTLPWRSOMC  INVALID FIELD IN PARAMETER LIST                       |
>     | 49h  00h  DTLPWRSOMC  INVALID MESSAGE ERROR                                 |
>     | 11h  05h      WR O    L-EC UNCORRECTABLE ERROR                              |
>     | 60h  00h        S     LAMP FAILURE                                          |
>     | 5Bh  02h  DTLPWRSOM   LOG COUNTER AT MAXIMUM                                |
>     | 5Bh  00h  DTLPWRSOM   LOG EXCEPTION                                         |
>     | 5Bh  03h  DTLPWRSOM   LOG LIST CODES EXHAUSTED                              |
>     | 2Ah  02h  DTL WRSOMC  LOG PARAMETERS CHANGED                                |
>     | 21h  00h  DT  WR OM   LOGICAL BLOCK ADDRESS OUT OF RANGE                    |
>     | 08h  00h  DTL WRSOMC  LOGICAL UNIT COMMUNICATION FAILURE                    |
>     | 08h  02h  DTL WRSOMC  LOGICAL UNIT COMMUNICATION PARITY ERROR               |
>     | 08h  01h  DTL WRSOMC  LOGICAL UNIT COMMUNICATION TIME-OUT                   |
>     | 4Ch  00h  DTLPWRSOMC  LOGICAL UNIT FAILED SELF-CONFIGURATION                |
>     | 3Eh  00h  DTLPWRSOMC  LOGICAL UNIT HAS NOT SELF-CONFIGURED YET              |
>     | 04h  01h  DTLPWRSOMC  LOGICAL UNIT IS IN PROCESS OF BECOMING READY          |
>     | 04h  00h  DTLPWRSOMC  LOGICAL UNIT NOT READY, CAUSE NOT REPORTABLE          |
>     | 04h  04h  DTL    O    LOGICAL UNIT NOT READY, FORMAT IN PROGRESS            |
>     | 04h  02h  DTLPWRSOMC  LOGICAL UNIT NOT READY, INITIALIZING COMMAND REQUIRED |
>     | 04h  03h  DTLPWRSOMC  LOGICAL UNIT NOT READY, MANUAL INTERVENTION REQUIRED  |
>     | 25h  00h  DTLPWRSOMC  LOGICAL UNIT NOT SUPPORTED                            |
>     | 15h  01h  DTL WRSOM   MECHANICAL POSITIONING ERROR                          |
>     | 53h  00h  DTL WRSOM   MEDIA LOAD OR EJECT FAILED                            |
>     | 3Bh  0Dh          M   MEDIUM DESTINATION ELEMENT FULL                       |
>     | 31h  00h  DT  W  O    MEDIUM FORMAT CORRUPTED                               |
>     | 3Ah  00h  DTL WRSOM   MEDIUM NOT PRESENT                                    |
>     | 53h  02h  DT  WR OM   MEDIUM REMOVAL PREVENTED                              |
>     | 3Bh  0Eh          M   MEDIUM SOURCE ELEMENT EMPTY                           |
>     | 43h  00h  DTLPWRSOMC  MESSAGE ERROR                                         |
>     | 3Fh  01h  DTLPWRSOMC  MICROCODE HAS BEEN CHANGED                            |
>     | 1Dh  00h  D   W  O    MISCOMPARE DURING VERIFY OPERATION                    |
>     | 11h  0Ah  DT     O    MISCORRECTED ERROR                                    |
>     | 2Ah  01h  DTL WRSOMC  MODE PARAMETERS CHANGED                               |
>     | 07h  00h  DTL WRSOM   MULTIPLE PERIPHERAL DEVICES SELECTED                  |
>     | 11h  03h  DT  W SO    MULTIPLE READ ERRORS                                  |
>     | 00h  00h  DTLPWRSOMC  NO ADDITIONAL SENSE INFORMATION                       |
>     | 00h  15h       R      NO CURRENT AUDIO STATUS TO RETURN                     |
>     | 32h  00h  D   W  O    NO DEFECT SPARE LOCATION AVAILABLE                    |
>     | 11h  09h   T          NO GAP FOUND                                          |
>     | 01h  00h  D   W  O    NO INDEX/SECTOR SIGNAL                                |
>     | 06h  00h  D   WR OM   NO REFERENCE POSITION FOUND                           |
>     +=============================================================================+

> `

> `

>     Table 71: (continued)
>     +=============================================================================+
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     | 02h  00h  D   WR OM   NO SEEK COMPLETE                                      |
>     | 03h  01h   T          NO WRITE CURRENT                                      |
>     | 28h  00h  DTLPWRSOMC  NOT READY TO READY TRANSITION, MEDIUM MAY HAVE CHANGED|
>     | 5Ah  01h  DT  WR OM   OPERATOR MEDIUM REMOVAL REQUEST                       |
>     | 5Ah  00h  DTLPWRSOM   OPERATOR REQUEST OR STATE CHANGE INPUT (UNSPECIFIED)  |
>     | 5Ah  03h  DT  W  O    OPERATOR SELECTED WRITE PERMIT                        |
>     | 5Ah  02h  DT  W  O    OPERATOR SELECTED WRITE PROTECT                       |
>     | 61h  02h        S     OUT OF FOCUS                                          |
>     | 4Eh  00h  DTLPWRSOMC  OVERLAPPED COMMANDS ATTEMPTED                         |
>     | 2Dh  00h   T          OVERWRITE ERROR ON UPDATE IN PLACE                    |
>     | 3Bh  05h    L         PAPER JAM                                             |
>     | 1Ah  00h  DTLPWRSOMC  PARAMETER LIST LENGTH ERROR                           |
>     | 26h  01h  DTLPWRSOMC  PARAMETER NOT SUPPORTED                               |
>     | 26h  02h  DTLPWRSOMC  PARAMETER VALUE INVALID                               |
>     | 2Ah  00h  DTL WRSOMC  PARAMETERS CHANGED                                    |
>     | 03h  00h  DTL W SO    PERIPHERAL DEVICE WRITE FAULT                         |
>     | 50h  02h   T          POSITION ERROR RELATED TO TIMING                      |
>     | 3Bh  0Ch        S     POSITION PAST BEGINNING OF MEDIUM                     |
>     | 3Bh  0Bh        S     POSITION PAST END OF MEDIUM                           |
>     | 15h  02h  DT  WR O    POSITIONING ERROR DETECTED BY READ OF MEDIUM          |
>     | 29h  00h  DTLPWRSOMC  POWER ON, RESET, OR BUS DEVICE RESET OCCURRED         |
>     | 42h  00h  D           POWER-ON OR SELF-TEST FAILURE (SHOULD USE 40 NN)      |
>     | 1Ch  01h  D      O    PRIMARY DEFECT LIST NOT FOUND                         |
>     | 40h  00h  D           RAM FAILURE (SHOULD USE 40 NN)                        |
>     | 15h  00h  DTL WRSOM   RANDOM POSITIONING ERROR                              |
>     | 3Bh  0Ah        S     READ PAST BEGINNING OF MEDIUM                         |
>     | 3Bh  09h        S     READ PAST END OF MEDIUM                               |
>     | 11h  01h  DT  W SO    READ RETRIES EXHAUSTED                                |
>     | 14h  01h  DT  WR O    RECORD NOT FOUND                                      |
>     | 14h  00h  DTL WRSO    RECORDED ENTITY NOT FOUND                             |
>     | 18h  02h  D   WR O    RECOVERED DATA - DATA AUTO-REALLOCATED                |
>     | 18h  05h  D   WR O    RECOVERED DATA - RECOMMEND REASSIGNMENT               |
>     | 18h  06h  D   WR O    RECOVERED DATA - RECOMMEND REWRITE                    |
>     | 17h  05h  D   WR O    RECOVERED DATA USING PREVIOUS SECTOR ID               |
>     | 18h  03h       R      RECOVERED DATA WITH CIRC                              |
>     | 18h  01h  D   WR O    RECOVERED DATA WITH ERROR CORRECTION & RETRIES APPLIED|
>     | 18h  00h  DT  WR O    RECOVERED DATA WITH ERROR CORRECTION APPLIED          |
>     | 18h  04h       R      RECOVERED DATA WITH L-EC                              |
>     | 17h  03h  DT  WR O    RECOVERED DATA WITH NEGATIVE HEAD OFFSET              |
>     | 17h  00h  DT  WRSO    RECOVERED DATA WITH NO ERROR CORRECTION APPLIED       |
>     | 17h  02h  DT  WR O    RECOVERED DATA WITH POSITIVE HEAD OFFSET              |
>     | 17h  01h  DT  WRSO    RECOVERED DATA WITH RETRIES                           |
>     | 17h  04h      WR O    RECOVERED DATA WITH RETRIES AND/OR CIRC APPLIED       |
>     | 17h  06h  D   W  O    RECOVERED DATA WITHOUT ECC - DATA AUTO-REALLOCATED    |
>     | 17h  07h  D   W  O    RECOVERED DATA WITHOUT ECC - RECOMMEND REASSIGNMENT   |
>     | 17h  08h  D   W  O    RECOVERED DATA WITHOUT ECC - RECOMMEND REWRITE        |
>     | 1Eh  00h  D   W  O    RECOVERED ID WITH ECC CORRECTION                      |
>     | 3Bh  08h   T          REPOSITION ERROR                                      |
>     | 36h  00h    L         RIBBON, INK, OR TONER FAILURE                         |
>     | 37h  00h  DTL WRSOMC  ROUNDED PARAMETER                                     |
>     | 5Ch  00h  D      O    RPL STATUS CHANGE                                     |
>     | 39h  00h  DTL WRSOMC  SAVING PARAMETERS NOT SUPPORTED                       |
>     | 62h  00h        S     SCAN HEAD POSITIONING ERROR                           |
>     | 47h  00h  DTLPWRSOMC  SCSI PARITY ERROR                                     |
>     | 54h  00h     P        SCSI TO HOST SYSTEM INTERFACE FAILURE                 |
>     | 45h  00h  DTLPWRSOMC  SELECT OR RESELECT FAILURE                            |
>     +=============================================================================+

> `

> `

>     Table 71: (concluded)
>     +=============================================================================+
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     | 3Bh  00h   TL         SEQUENTIAL POSITIONING ERROR                          |
>     | 00h  03h   T          SETMARK DETECTED                                      |
>     | 3Bh  04h    L         SLEW FAILURE                                          |
>     | 09h  03h      WR O    SPINDLE SERVO FAILURE                                 |
>     | 5Ch  02h  D      O    SPINDLES NOT SYNCHRONIZED                             |
>     | 5Ch  01h  D      O    SPINDLES SYNCHRONIZED                                 |
>     | 1Bh  00h  DTLPWRSOMC  SYNCHRONOUS DATA TRANSFER ERROR                       |
>     | 55h  00h     P        SYSTEM RESOURCE FAILURE                               |
>     | 33h  00h   T          TAPE LENGTH ERROR                                     |
>     | 3Bh  03h    L         TAPE OR ELECTRONIC VERTICAL FORMS UNIT NOT READY      |
>     | 3Bh  01h   T          TAPE POSITION ERROR AT BEGINNING-OF-MEDIUM            |
>     | 3Bh  02h   T          TAPE POSITION ERROR AT END-OF-MEDIUM                  |
>     | 3Fh  00h  DTLPWRSOMC  TARGET OPERATING CONDITIONS HAVE CHANGED              |
>     | 5Bh  01h  DTLPWRSOM   THRESHOLD CONDITION MET                               |
>     | 26h  03h  DTLPWRSOMC  THRESHOLD PARAMETERS NOT SUPPORTED                    |
>     | 2Ch  01h        S     TOO MANY WINDOWS SPECIFIED                            |
>     | 09h  00h  DT  WR O    TRACK FOLLOWING ERROR                                 |
>     | 09h  01h      WR O    TRACKING SERVO FAILURE                                |
>     | 61h  01h        S     UNABLE TO ACQUIRE VIDEO                               |
>     | 57h  00h       R      UNABLE TO RECOVER TABLE-OF-CONTENTS                   |
>     | 53h  01h   T          UNLOAD TAPE FAILURE                                   |
>     | 11h  00h  DT  WRSO    UNRECOVERED READ ERROR                                |
>     | 11h  04h  D   W  O    UNRECOVERED READ ERROR - AUTO REALLOCATE FAILED       |
>     | 11h  0Bh  D   W  O    UNRECOVERED READ ERROR - RECOMMEND REASSIGNMENT       |
>     | 11h  0Ch  D   W  O    UNRECOVERED READ ERROR - RECOMMEND REWRITE THE DATA   |
>     | 46h  00h  DTLPWRSOMC  UNSUCCESSFUL SOFT RESET                               |
>     | 59h  00h         O    UPDATED BLOCK READ                                    |
>     | 61h  00h        S     VIDEO ACQUISITION ERROR                               |
>     | 50h  00h   T          WRITE APPEND ERROR                                    |
>     | 50h  01h   T          WRITE APPEND POSITION ERROR                           |
>     | 0Ch  00h   T    S     WRITE ERROR                                           |
>     | 0Ch  02h  D   W  O    WRITE ERROR - AUTO REALLOCATION FAILED                |
>     | 0Ch  01h  D   W  O    WRITE ERROR RECOVERED WITH AUTO REALLOCATION          |
>     | 27h  00h  DT  W  O    WRITE PROTECTED                                       |
>     |                                                                             |
>     | 80h  XXh     \                                                              |
>     | THROUGH       >       VENDOR SPECIFIC.                                      |
>     | FFh  XX      /                                                              |
>     |                                                                             |
>     | XXh  80h     \                                                              |
>     | THROUGH       >       VENDOR SPECIFIC QUALIFICATION OF STANDARD ASC.        |
>     | XXh  FFh     /                                                              |
>     |                       ALL CODES NOT SHOWN ARE RESERVED.                     |
>     |-----------------------------------------------------------------------------|

> `

## 22.2 ASC and ASCQ in numerical order

> `

>                            Table 364: ASC and ASCQ Assignments

>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                                          |
>     |           .T - SEQUENTIAL ACCESS DEVICE                                     |
>     |           . L - PRINTER DEVICE                                              |
>     |           .  P - PROCESSOR DEVICE                                           |
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE                           |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     |  00  00   DTLPWRSOMC  NO ADDITIONAL SENSE INFORMATION                       |
>     |  00  01    T          FILEMARK DETECTED                                     |
>     |  00  02    T    S     END-OF-PARTITION/MEDIUM DETECTED                      |
>     |  00  03    T          SETMARK DETECTED                                      |
>     |  00  04    T    S     BEGINNING-OF-PARTITION/MEDIUM DETECTED                |
>     |  00  05    T    S     END-OF-DATA DETECTED                                  |
>     |  00  06   DTLPWRSOMC  I/O PROCESS TERMINATED                                |
>     |  00  11   R           AUDIO PLAY OPERATION IN PROGRESS                      |
>     |  00  12   R           AUDIO PLAY OPERATION PAUSED                           |
>     |  00  13   R           AUDIO PLAY OPERATION SUCCESSFULLY COMPLETED           |
>     |  00  14   R           AUDIO PLAY OPERATION STOPPED DUE TO ERROR             |
>     |  00  15   R           NO CURRENT AUDIO STATUS TO RETURN                     |
>     |  01  00   DW  O       NO INDEX/SECTOR SIGNAL                                |
>     |  02  00   DWR OM      NO SEEK COMPLETE                                      |
>     |  03  00   DTL W SO    PERIPHERAL DEVICE WRITE FAULT                         |
>     |  03  01    T          NO WRITE CURRENT                                      |
>     |  03  02    T          EXCESSIVE WRITE ERRORS                                |
>     |  04  00   DTLPWRSOMC  LOGICAL UNIT NOT READY, CAUSE NOT REPORTABLE          |
>     |  04  01   DTLPWRSOMC  LOGICAL UNIT IS IN PROCESS OF BECOMING READY          |
>     |  04  02   DTLPWRSOMC  LOGICAL UNIT NOT READY, INITIALIZING COMMAND REQUIRED |
>     |  04  03   DTLPWRSOMC  LOGICAL UNIT NOT READY, MANUAL INTERVENTION REQUIRED  |
>     |  04  04   DTL    O    LOGICAL UNIT NOT READY, FORMAT IN PROGRESS            |
>     |  05  00   DTL WRSOMC  LOGICAL UNIT DOES NOT RESPOND TO SELECTION            |
>     |  06  00   DWR OM  NO  REFERENCE POSITION FOUND                              |
>     |  07  00   DTL WRSOM   MULTIPLE PERIPHERAL DEVICES SELECTED                  |
>     |  08  00   DTL WRSOMC  LOGICAL UNIT COMMUNICATION FAILURE                    |
>     |  08  01   DTL WRSOMC  LOGICAL UNIT COMMUNICATION TIME-OUT                   |
>     |  08  02   DTL WRSOMC  LOGICAL UNIT COMMUNICATION PARITY ERROR               |
>     |  09  00   DT  WR O    TRACK FOLLOWING ERROR                                 |
>     |  09  01       WR O    TRA CKING SERVO FAILURE                               |
>     |  09  02       WR O    FOC US SERVO FAILURE                                  |
>     |  09  03       WR O    SPI NDLE SERVO FAILURE                                |
>     +=============================================================================+

> `

> `

>     Table 364: (continued)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                                          |
>     |           .T - SEQUENTIAL ACCESS DEVICE                                     |
>     |           . L - PRINTER DEVICE                                              |
>     |           .  P - PROCESSOR DEVICE                                           |
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE                           |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     |  0A  00   DTLPWRSOMC  ERROR LOG OVERFLOW                                    |
>     |  0B  00                                                                     |
>     |  0C  00    T     S    WRITE ERROR                                           |
>     |  0C  01   D   W  O    WRITE ERROR RECOVERED WITH AUTO REALLOCATION          |
>     |  0C  02   D   W  O    WRITE ERROR - AUTO REALLOCATION FAILED                |
>     |  0D  00                                                                     |
>     |  0E  00                                                                     |
>     |  0F  00                                                                     |
>     |  10  00   D   W  O    ID CRC OR ECC ERROR                                   |
>     |  11  00   DT  WRSO    UNRECOVERED READ ERROR                                |
>     |  11  01   DT  W SO    READ RETRIES EXHAUSTED                                |
>     |  11  02   DT  W SO    ERROR TOO LONG TO CORRECT                             |
>     |  11  03   DT  W SO    MULTIPLE READ ERRORS                                  |
>     |  11  04   D   W  O    UNRECOVERED READ ERROR - AUTO REALLOCATE FAILED       |
>     |  11  05       WR O    L-EC UNCORRECTABLE ERROR                              |
>     |  11  06       WR O    CIRC UNRECOVERED ERROR                                |
>     |  11  07       W  O    DATA RESYCHRONIZATION ERROR                           |
>     |  11  08    T          INCOMPLETE BLOCK READ                                 |
>     |  11  09    T          NO GAP FOUND                                          |
>     |  11  0A   DT     O    MISCORRECTED ERROR                                    |
>     |  11  0B   D   W  O    UNRECOVERED READ ERROR - RECOMMEND REASSIGNMENT       |
>     |  11  0C   D   W  O    UNRECOVERED READ ERROR - RECOMMEND REWRITE THE DATA   |
>     |  12  00   D   W  O    ADDRESS MARK NOT FOUND FOR ID FIELD                   |
>     |  13  00   D   W  O    ADDRESS MARK NOT FOUND FOR DATA FIELD                 |
>     |  14  00   DTL WRSO    RECORDED ENTITY NOT FOUND                             |
>     |  14  01   DT  WR O    RECORD NOT FOUND                                      |
>     |  14  02    T          FILEMARK OR SETMARK NOT FOUND                         |
>     |  14  03    T          END-OF-DATA NOT FOUND                                 |
>     |  14  04    T          BLOCK SEQUENCE ERROR                                  |
>     |  15  00   DTL WRSOM   RANDOM POSITIONING ERROR                              |
>     |  15  01   DTL WRSOM   MECHANICAL POSITIONING ERROR                          |
>     |  15  02   DT  WR O    POSITIONING ERROR DETECTED BY READ OF MEDIUM          |
>     |  16  00   DW     O    DATA SYNCHRONIZATION MARK ERROR                       |
>     |  17  00   DT  WRSO    RECOVERED DATA WITH NO ERROR CORRECTION APPLIED       |
>     |  17  01   DT  WRSO    RECOVERED DATA WITH RETRIES                           |
>     |  17  02   DT  WR O    RECOVERED DATA WITH POSITIVE HEAD OFFSET              |
>     |  17  03   DT  WR O    RECOVERED DATA WITH NEGATIVE HEAD OFFSET              |
>     |  17  04       WR O    RECOVERED DATA WITH RETRIES AND/OR CIRC APPLIED       |
>     |  17  05   D   WR O    RECOVERED DATA USING PREVIOUS SECTOR ID               |
>     |  17  06   D   W  O    RECOVERED DATA WITHOUT ECC - DATA AUTO-REALLOCATED    |
>     |  17  07   D   W  O    RECOVERED DATA WITHOUT ECC - RECOMMEND REASSIGNMENT   |
>     |  17  08   D   W  O    RECOVERED DATA WITHOUT ECC - RECOMMEND REWRITE        |
>     |  18  00   DT  WR O    RECOVERED DATA WITH ERROR CORRECTION APPLIED          |
>     |  18  01   D   WR O    RECOVERED DATA WITH ERROR CORRECTION & RETRIES APPLIED|
>     |  18  02   D   WR O    RECOVERED DATA - DATA AUTO-REALLOCATED                |
>     |  18  03        R      RECOVERED DATA WITH CIRC                              |
>     |  18  04        R      RECOVERED DATA WITH LEC                               |
>     |  18  05   D   WR O    RECOVERED DATA - RECOMMEND REASSIGNMENT               |
>     |  18  06   D   WR O    RECOVERED DATA - RECOMMEND REWRITE                    |
>     +=============================================================================+

> `

> `

>     Table 364: (continued)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                                          |
>     |           .T - SEQUENTIAL ACCESS DEVICE                                     |
>     |           . L - PRINTER DEVICE                                              |
>     |           .  P - PROCESSOR DEVICE                                           |
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE                           |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     |  19  00   D      O    DEFECT LIST ERROR                                     |
>     |  19  01   D      O    DEFECT LIST NOT AVAILABLE                             |
>     |  19  02   D      O    DEFECT LIST ERROR IN PRIMARY LIST                     |
>     |  19  03   D      O    DEFECT LIST ERROR IN GROWN LIST                       |
>     |  1A  00   DTLPWRSOMC  PARAMETER LIST LENGTH ERROR                           |
>     |  1B  00   DTLPWRSOMC  SYNCHRONOUS DATA TRANSFER ERROR                       |
>     |  1C  00   D      O    DEFECT LIST NOT FOUND                                 |
>     |  1C  01   D      O    PRIMARY DEFECT LIST NOT FOUND                         |
>     |  1C  02   D      O    GROWN DEFECT LIST NOT FOUND                           |
>     |  1D  00   D   W  O    MISCOMPARE DURING VERIFY OPERATION                    |
>     |  1E  00   D   W  O    RECOVERED ID WITH ECC                                 |
>     |  1F  00                                                                     |
>     |  20  00   DTLPWRSOMC  INVALID COMMAND OPERATION CODE                        |
>     |  21  00   DT  WR OM   LOGICAL BLOCK ADDRESS OUT OF RANGE                    |
>     |  21  01           M   INVALID ELEMENT ADDRESS                               |
>     |  22  00   D           ILLEGAL FUNCTION (SHOULD USE 20 00, 24 00, OR 26 00)  |
>     |  23  00                                                                     |
>     |  24  00   DTLPWRSOMC  INVALID FIELD IN CDB                                  |
>     |  25  00   DTLPWRSOMC  LOGICAL UNIT NOT SUPPORTED                            |
>     |  26  00   DTLPWRSOMC  INVALID FIELD IN PARAMETER LIST                       |
>     |  26  01   DTLPWRSOMC  PARAMETER NOT SUPPORTED                               |
>     |  26  02   DTLPWRSOMC  PARAMETER VALUE INVALID                               |
>     |  26  03   DTLPWRSOMC  THRESHOLD PARAMETERS NOT SUPPORTED                    |
>     |  27  00   DT  W  O    WRITE PROTECTED                                       |
>     |  28  00   DTLPWRSOMC  NOT READY TO READY TRANSITION(MEDIUM MAY HAVE CHANGED)|
>     |  28  01           M   IMPORT OR EXPORT ELEMENT ACCESSED                     |
>     |  29  00   DTLPWRSOMC  POWER ON, RESET, OR BUS DEVICE RESET OCCURRED         |
>     |  2A  00   DTL WRSOMC  PARAMETERS CHANGED                                    |
>     |  2A  01   DTL WRSOMC  MODE PARAMETERS CHANGED                               |
>     |  2A  02   DTL WRSOMC  LOG PARAMETERS CHANGED                                |
>     |  2B  00   DTLPWRSO C  COPY CANNOT EXECUTE SINCE HOST CANNOT DISCONNECT      |
>     |  2C  00   DTLPWRSOMC  COMMAND SEQUENCE ERROR                                |
>     |  2C  01         S     TOO MANY WINDOWS SPECIFIED                            |
>     |  2C  02         S     INVALID COMBINATION OF WINDOWS SPECIFIED              |
>     |  2D  00    T          OVERWRITE ERROR ON UPDATE IN PLACE                    |
>     |  2E  00                                                                     |
>     |  2F  00   DTLPWRSOMC  COMMANDS CLEARED BY ANOTHER INITIATOR                 |
>     |  30  00   DT  WR OM   INCOMPATIBLE MEDIUM INSTALLED                         |
>     |  30  01   DT  WR O    CANNOT READ MEDIUM - UNKNOWN FORMAT                   |
>     |  30  02   DT  WR O    CANNOT READ MEDIUM - INCOMPATIBLE FORMAT              |
>     |  30  03   DT          CLEANING CARTRIDGE INSTALLED                          |
>     |  31  00   DT  W  O    MEDIUM FORMAT CORRUPTED                               |
>     |  31  01   D L    O    FORMAT COMMAND FAILED                                 |
>     |  32  00   D   W  O    NO DEFECT SPARE LOCATION AVAILABLE                    |
>     |  32  01   D   W  O    DEFECT LIST UPDATE FAILURE                            |
>     |  33  00    T          TAPE LENGTH ERROR                                     |
>     |  34  00                                                                     |
>     |  35  00                                                                     |
>     |  36  00     L         RIBBON, INK, OR TONER FAILURE                         |
>     +=============================================================================+

> `

> `

>     Table 364: (continued)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                                          |
>     |           .T - SEQUENTIAL ACCESS DEVICE                                     |
>     |           . L - PRINTER DEVICE                                              |
>     |           .  P - PROCESSOR DEVICE                                           |
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE                           |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     |  37  00   DTL WRSOMC  ROUNDED PARAMETER                                     |
>     |  38  00                                                                     |
>     |  39  00   DTL WRSOMC  SAVING PARAMETERS NOT SUPPORTED                       |
>     |  3A  00   DTL WRSOM   MEDIUM NOT PRESENT                                    |
>     |  3B  00    TL         SEQUENTIAL POSITIONING ERROR                          |
>     |  3B  01    T          TAPE POSITION ERROR AT BEGINNING-OF-MEDIUM            |
>     |  3B  02    T          TAPE POSITION ERROR AT END-OF-MEDIUM                  |
>     |  3B  03     L         TAPE OR ELECTRONIC VERTICAL FORMS UNIT NOT READY      |
>     |  3B  04     L         SLEW FAILURE                                          |
>     |  3B  05     L         PAPER JAM                                             |
>     |  3B  06     L         FAILED TO SENSE TOP-OF-FORM                           |
>     |  3B  07     L         FAILED TO SENSE BOTTOM-OF-FORM                        |
>     |  3B  08    T          REPOSITION ERROR                                      |
>     |  3B  09         S     READ PAST END OF MEDIUM                               |
>     |  3B  0A         S     READ PAST BEGINNING OF MEDIUM                         |
>     |  3B  0B         S     POSITION PAST END OF MEDIUM                           |
>     |  3B  0C         S     POSITION PAST BEGINNING OF MEDIUM                     |
>     |  3B  0D           M   MEDIUM DESTINATION ELEMENT FULL                       |
>     |  3B  0E           M   MEDIUM SOURCE ELEMENT EMPTY                           |
>     |  3C  00                                                                     |
>     |  3D  00   DTLPWRSOMC  INVALID BITS IN IDENTIFY MESSAGE                      |
>     |  3E  00   DTLPWRSOMC  LOGICAL UNIT HAS NOT SELF-CONFIGURED YET              |
>     |  3F  00   DTLPWRSOMC  TARGET OPERATING CONDITIONS HAVE CHANGED              |
>     |  3F  01   DTLPWRSOMC  MICROCODE HAS BEEN CHANGED                            |
>     |  3F  02   DTLPWRSOMC  CHANGED OPERATING DEFINITION                          |
>     |  3F  03   DTLPWRSOMC  INQUIRY DATA HAS CHANGED                              |
>     |  40  00   D           RAM FAILURE (SHOULD USE 40 NN)                        |
>     |  40  NN   DTLPWRSOMC  DIAGNOSTIC FAILURE ON COMPONENT NN (80H-FFH)          |
>     |  41  00   D           DATA PATH FAILURE (SHOULD USE 40 NN)                  |
>     |  42  00   D           POWER-ON OR SELF-TEST FAILURE (SHOULD USE 40 NN)      |
>     |  43  00   DTLPWRSOMC  MESSAGE ERROR                                         |
>     |  44  00   DTLPWRSOMC  INTERNAL TARGET FAILURE                               |
>     |  45  00   DTLPWRSOMC  SELECT OR RESELECT FAILURE                            |
>     |  46  00   DTLPWRSOMC  UNSUCCESSFUL SOFT RESET                               |
>     |  47  00   DTLPWRSOMC  SCSI PARITY ERROR                                     |
>     |  48  00   DTLPWRSOMC  INITIATOR DETECTED ERROR MESSAGE RECEIVED             |
>     |  49  00   DTLPWRSOMC  INVALID MESSAGE ERROR                                 |
>     |  4A  00   DTLPWRSOMC  COMMAND PHASE ERROR                                   |
>     |  4B  00   DTLPWRSOMC  DATA PHASE ERROR                                      |
>     |  4C  00   DTLPWRSOMC  LOGICAL UNIT FAILED SELF-CONFIGURATION                |
>     |  4D  00                                                                     |
>     |  4E  00   DTLPWRSOMC  OVERLAPPED COMMANDS ATTEMPTED                         |
>     |  4F  00                                                                     |
>     |  50  00    T          WRITE APPEND ERROR                                    |
>     |  50  01    T          WRITE APPEND POSITION ERROR                           |
>     |  50  02    T          POSITION ERROR RELATED TO TIMING                      |
>     |  51  00    T     O    ERASE FAILURE                                         |
>     |  52  00    T          CARTRIDGE FAULT                                       |
>     +=============================================================================+

> `

> `

>     Table 364: (continued)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                                          |
>     |           .T - SEQUENTIAL ACCESS DEVICE                                     |
>     |           . L - PRINTER DEVICE                                              |
>     |           .  P - PROCESSOR DEVICE                                           |
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE                           |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     |  53  00   DTL WRSOM   MEDIA LOAD OR EJECT FAILED                            |
>     |  53  01    T          UNLOAD TAPE FAILURE                                   |
>     |  53  02   DT  WR OM   MEDIUM REMOVAL PREVENTED                              |
>     |  54  00      P        SCSI TO HOST SYSTEM INTERFACE FAILURE                 |
>     |  55  00      P        SYSTEM RESOURCE FAILURE                               |
>     |  56  00                                                                     |
>     |  57  00        R      UNABLE TO RECOVER TABLE-OF-CONTENTS                   |
>     |  58  00     O         GENERATION DOES NOT EXIST                             |
>     |  59  00     O         UPDATED BLOCK READ                                    |
>     |  5A  00   DTLPWRSOM   OPERATOR REQUEST OR STATE CHANGE INPUT (UNSPECIFIED)  |
>     |  5A  01   DT  WR OM   OPERATOR MEDIUM REMOVAL REQUEST                       |
>     |  5A  02   DT  W  O    OPERATOR SELECTED WRITE PROTECT                       |
>     |  5A  03   DT  W  O    OPERATOR SELECTED WRITE PERMIT                        |
>     |  5B  00   DTLPWRSOM   LOG EXCEPTION                                         |
>     |  5B  01   DTLPWRSOM   THRESHOLD CONDITION MET                               |
>     |  5B  02   DTLPWRSOM   LOG COUNTER AT MAXIMUM                                |
>     |  5B  03   DTLPWRSOM   LOG LIST CODES EXHAUSTED                              |
>     |  5C  00   D   O       RPL STATUS CHANGE                                     |
>     |  5C  01   D   O       SPINDLES SYNCHRONIZED                                 |
>     |  5C  02   D   O       SPINDLES NOT SYNCHRONIZED                             |
>     |  5D  00                                                                     |
>     |  5E  00                                                                     |
>     |  5F  00                                                                     |
>     |  60  00         S     LAMP FAILURE                                          |
>     |  61  00         S     VIDEO ACQUISITION ERROR                               |
>     |  61  01         S     UNABLE TO ACQUIRE VIDEO                               |
>     |  61  02         S     OUT OF FOCUS                                          |
>     |  62  00         S     SCAN HEAD POSITIONING ERROR                           |
>     |  63  00        R      END OF USER AREA ENCOUNTERED ON THIS TRACK            |
>     |  64  00        R      ILLEGAL MODE FOR THIS TRACK                           |
>     |  65  00                                                                     |
>     |  66  00                                                                     |
>     |  67  00                                                                     |
>     |  68  00                                                                     |
>     |  69  00                                                                     |
>     |  6A  00                                                                     |
>     |  6B  00                                                                     |
>     |  6C  00                                                                     |
>     |  6D  00                                                                     |
>     |  6E  00                                                                     |
>     |  6F  00                                                                     |
>     +=============================================================================+

> `

> `

>     Table 364: (concluded)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                                          |
>     |           .T - SEQUENTIAL ACCESS DEVICE                                     |
>     |           . L - PRINTER DEVICE                                              |
>     |           .  P - PROCESSOR DEVICE                                           |
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE                           |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     | ASC ASCQ  DTLPWRSOMC  DESCRIPTION                                           |
>     | --- ----              ----------------------------------------------------- |
>     |  70  00                                                                     |
>     |  71  00                                                                     |
>     |  72  00                                                                     |
>     |  73  00                                                                     |
>     |  74  00                                                                     |
>     |  75  00                                                                     |
>     |  76  00                                                                     |
>     |  77  00                                                                     |
>     |  78  00                                                                     |
>     |  79  00                                                                     |
>     |  7A  00                                                                     |
>     |  7B  00                                                                     |
>     |  7C  00                                                                     |
>     |  7D  00                                                                     |
>     |  7E  00                                                                     |
>     |  7F  00                                                                     |
>     |                                                                             |
>     |  80  xxh \                                                                  |
>     |   THROUGH >  VENDOR SPECIFIC.                                               |
>     |  FF  xxh /                                                                  |
>     |                                                                             |
>     |  xxh 80 \                                                                   |
>     |  THROUGH >  VENDOR SPECIFIC QUALIFICATION OF STANDARD ASC.                  |
>     |  xxh FF /                                                                   |
>     |               ALL CODES NOT SHOWN OR BLANK ARE RESERVED.                    |
>     +=============================================================================+

> `

## 23. A SCSI command code quick reference

> `

>     Table 365 is a numerical order listing of the command operation codes.

>                             Table 365: SCSI-2 Operation Codes

>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                       Device Column Key  |
>     |           .T - SEQUENTIAL ACCESS DEVICE                  M = Mandatory      |
>     |           . L - PRINTER DEVICE                           O = Optional       |
>     |           .  P - PROCESSOR DEVICE                        V = Vendor Specific|
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE        R = Reserved       |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     |        OP DTLPWRSOMC Description                                            |
>     |----------+----------+-------------------------------------------------------|
>     |        00 MMMMMMMMMM TEST UNIT READY                                        |
>     |        01  M         REWIND                                                 |
>     |        01 O V OO OO  REZERO UNIT                                            |
>     |        02 VVVVVV  V                                                         |
>     |        03 MMMMMMMMMM REQUEST SENSE                                          |
>     |        04   O        FORMAT                                                 |
>     |        04 M      O   FORMAT UNIT                                            |
>     |        05 VMVVVV  V  READ BLOCK LIMITS                                      |
>     |        06 VVVVVV  V                                                         |
>     |        07         O  INITIALIZE ELEMENT STATUS                              |
>     |        07 OVV O  OV  REASSIGN BLOCKS                                        |
>     |        08          M GET MESSAGE(06)                                        |
>     |        08 OMV OO OV  READ(06)                                               |
>     |        08    O       RECEIVE                                                |
>     |        09 VVVVVV  V                                                         |
>     |        0A   M        PRINT                                                  |
>     |        0A          M SEND MESSAGE(06)                                       |
>     |        0A    M       SEND(06)                                               |
>     |        0A OM  O  OV  WRITE(06)                                              |
>     |        0B O   OO OV  SEEK(06)                                               |
>     |        0B   O        SLEW AND PRINT                                         |
>     |        0C VVVVVV  V                                                         |
>     |        0D VVVVVV  V                                                         |
>     |        0E VVVVVV  V                                                         |
>     |        0F VOVVVV  V  READ REVERSE                                           |
>     |        10   O O      SYNCHRONIZE BUFFER                                     |
>     |        10 VM VVV     WRITE FILEMARKS                                        |
>     |        11 VMVVVV     SPACE                                                  |
>     |        12 MMMMMMMMMM INQUIRY                                                |
>     |        13 VOVVVV     VERIFY(06)                                             |
>     |        14 VOOVVV     RECOVER BUFFERED DATA                                  |
>     |        15 OMO OOOOOO MODE SELECT(06)                                        |
>     |        16 M   MM MO  RESERVE                                                |
>     |        16  MM   M    RESERVE UNIT                                           |
>     |        17 M   MM MO  RELEASE                                                |
>     |        17  MM   M    RELEASE UNIT                                           |
>     |        18 OOOOOOOO   COPY                                                   |
>     |        19 VMVVVV     ERASE                                                  |
>     |        1A OMO OOOOOO MODE SENSE(06)                                         |
>     |        1B  O         LOAD UNLOAD                                            |
>     |        1B       O    SCAN                                                   |
>     |        1B   O        STOP PRINT                                             |
>     |        1B O   OO O   STOP START UNIT                                        |
>     +=============================================================================+

> `

> `

>     Table 365: (continued)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                       Device Column Key  |
>     |           .T - SEQUENTIAL ACCESS DEVICE                  M = Mandatory      |
>     |           . L - PRINTER DEVICE                           O = Optional       |
>     |           .  P - PROCESSOR DEVICE                        V = Vendor Specific|
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE        R = Reserved       |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     |        OP DTLPWRSOMC Description                                            |
>     |----------+----------+-------------------------------------------------------|
>     |        1C OOOOOOOOOO RECEIVE DIAGNOSTIC RESULTS                             |
>     |        1D MMMMMMMMMM SEND DIAGNOSTIC                                        |
>     |        1E OO  OO OO  PREVENT ALLOW MEDIUM REMOVAL                           |
>     |        1F                                                                   |
>     |        20 V   VV V                                                          |
>     |        21 V   VV V                                                          |
>     |        22 V   VV V                                                          |
>     |        23 V   VV V                                                          |
>     |        24 V   VVM    SET WINDOW                                             |
>     |        25       O    GET WINDOW                                             |
>     |        25 M   M  M   READ CAPACITY                                          |
>     |        25      M     READ CD-ROM CAPACITY                                   |
>     |        26 V   VV                                                            |
>     |        27 V   VV                                                            |
>     |        28          O GET MESSAGE(10)                                        |
>     |        28 M   MMMM   READ(10)                                               |
>     |        29 V   VV O   READ GENERATION                                        |
>     |        2A          O SEND MESSAGE(10)                                       |
>     |        2A       O    SEND(10)                                               |
>     |        2A M   M  M   WRITE(10)                                              |
>     |        2B  O         LOCATE                                                 |
>     |        2B         O  POSITION TO ELEMENT                                    |
>     |        2B O   OO O   SEEK(10)                                               |
>     |        2C V      O   ERASE(10)                                              |
>     |        2D V   O  O   READ UPDATED BLOCK                                     |
>     |        2E O   O  O   WRITE AND VERIFY(10)                                   |
>     |        2F O   OO O   VERIFY(10)                                             |
>     |        30 O   OO O   SEARCH DATA HIGH(10)                                   |
>     |        31       O    OBJECT POSITION                                        |
>     |        31 O   OO O   SEARCH DATA EQUAL(10)                                  |
>     |        32 O   OO O   SEARCH DATA LOW(10)                                    |
>     |        33 O   OO O   SET LIMITS(10)                                         |
>     |        34       O    GET DATA BUFFER STATUS                                 |
>     |        34 O   OO O   PRE-FETCH                                              |
>     |        34  O         READ POSITION                                          |
>     |        35 O   OO O   SYNCHRONIZE CACHE                                      |
>     |        36 O   OO O   LOCK UNLOCK CACHE                                      |
>     |        37 O      O   READ DEFECT DATA(10)                                   |
>     |        38     O  O   MEDIUM SCAN                                            |
>     |        39 OOOOOOOO   COMPARE                                                |
>     |        3A OOOOOOOO   COPY AND VERIFY                                        |
>     |        3B OOOOOOOOOO WRITE BUFFER                                           |
>     |        3C OOOOOOOOOO READ BUFFER                                            |
>     |        3D     O  O   UPDATE BLOCK                                           |
>     |        3E O   OO O   READ LONG                                              |
>     |        3F O   O  O   WRITE LONG                                             |
>     +=============================================================================+

> `

> `

>     Table 365: (continued)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                       Device Column Key  |
>     |           .T - SEQUENTIAL ACCESS DEVICE                  M = Mandatory      |
>     |           . L - PRINTER DEVICE                           O = Optional       |
>     |           .  P - PROCESSOR DEVICE                        V = Vendor Specific|
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE        R = Reserved       |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     |        OP DTLPWRSOMC Description                                            |
>     |----------+----------+-------------------------------------------------------|
>     |        40 OOOOOOOOOO CHANGE DEFINITION                                      |
>     |        41 O          WRITE SAME                                             |
>     |        42      O     READ SUB-CHANNEL                                       |
>     |        43      O     READ TOC                                               |
>     |        44      O     READ HEADER                                            |
>     |        45      O     PLAY AUDIO(10)                                         |
>     |        46                                                                   |
>     |        47      O     PLAY AUDIO MSF                                         |
>     |        48      O     PLAY AUDIO TRACK INDEX                                 |
>     |        49      O     PLAY TRACK RELATIVE(10)                                |
>     |        4A                                                                   |
>     |        4B      O     PAUSE RESUME                                           |
>     |        4C OOOOOOOOOO LOG SELECT                                             |
>     |        4D OOOOOOOOOO LOG SENSE                                              |
>     |        4E                                                                   |
>     |        4F                                                                   |
>     |        50                                                                   |
>     |        51                                                                   |
>     |        52                                                                   |
>     |        53                                                                   |
>     |        54                                                                   |
>     |        55 OOO OOOOOO MODE SELECT(10)                                        |
>     |        56                                                                   |
>     |        57                                                                   |
>     |        58                                                                   |
>     |        59                                                                   |
>     |        5A OOO OOOOOO MODE SENSE(10)                                         |
>     |        5B                                                                   |
>     |        5C                                                                   |
>     |        5D                                                                   |
>     |        5E                                                                   |
>     |        5F                                                                   |
>     +=============================================================================+

> `

> `

>     Table 365: (concluded)
>     +=============================================================================+
>     |           D - DIRECT ACCESS DEVICE                       Device Column Key  |
>     |           .T - SEQUENTIAL ACCESS DEVICE                  M = Mandatory      |
>     |           . L - PRINTER DEVICE                           O = Optional       |
>     |           .  P - PROCESSOR DEVICE                        V = Vendor Specific|
>     |           .  .W - WRITE ONCE READ MULTIPLE DEVICE        R = Reserved       |
>     |           .  . R - READ ONLY (CD-ROM) DEVICE                                |
>     |           .  .  S - SCANNER DEVICE                                          |
>     |           .  .  .O - OPTICAL MEMORY DEVICE                                  |
>     |           .  .  . M - MEDIA CHANGER DEVICE                                  |
>     |           .  .  .  C - COMMUNICATION DEVICE                                 |
>     |           .  .  .  .                                                        |
>     |        OP DTLPWRSOMC Description                                            |
>     |----------+----------+-------------------------------------------------------|
>     |        A0                                                                   |
>     |        A1                                                                   |
>     |        A2                                                                   |
>     |        A3                                                                   |
>     |        A4                                                                   |
>     |        A5         M  MOVE MEDIUM                                            |
>     |        A5      O     PLAY AUDIO(12)                                         |
>     |        A6         O  EXCHANGE MEDIUM                                        |
>     |        A7                                                                   |
>     |        A8          O GET MESSAGE(12)                                        |
>     |        A8     OO O   READ(12)                                               |
>     |        A9      O     PLAY TRACK RELATIVE(12)                                |
>     |        AA          O SEND MESSAGE(12)                                       |
>     |        AA     O  O   WRITE(12)                                              |
>     |        AB                                                                   |
>     |        AC        O   ERASE(12)                                              |
>     |        AD                                                                   |
>     |        AE     O  O   WRITE AND VERIFY(12)                                   |
>     |        AF     OO O   VERIFY(12)                                             |
>     |        B0     OO O   SEARCH DATA HIGH(12)                                   |
>     |        B1     OO O   SEARCH DATA EQUAL(12)                                  |
>     |        B2     OO O   SEARCH DATA LOW(12)                                    |
>     |        B3     OO O   SET LIMITS(12)                                         |
>     |        B4                                                                   |
>     |        B5                                                                   |
>     |        B5         O  REQUEST VOLUME ELEMENT ADDRESS                         |
>     |        B6                                                                   |
>     |        B6         O  SEND VOLUME TAG                                        |
>     |        B7        O   READ DEFECT DATA(12)                                   |
>     |        B8                                                                   |
>     |        B8         O  READ ELEMENT STATUS                                    |
>     |        B9                                                                   |
>     |        BA                                                                   |
>     |        BB                                                                   |
>     |        BC                                                                   |
>     |        BD                                                                   |
>     |        BE                                                                   |
>     |        BF                                                                   |
>     +=============================================================================+

> `

## 24. Example programs

Here is the C example program, which requests manufacturer/model and reports if a medium is loaded in the device.

> `

>     #define DEVICE "/dev/sgc"
>     /* Example program to demonstrate the generic SCSI interface */
>     #include <stdio.h>
>     #include <unistd.h>
>     #include <string.h>
>     #include <fcntl.h>
>     #include <errno.h>
>     #include <scsi/sg.h>

>     #define SCSI_OFF sizeof(struct sg_header)
>     static unsigned char cmd[SCSI_OFF + 18];      /* SCSI command buffer */
>     int fd;                               /* SCSI device/file descriptor */

>     /* process a complete scsi cmd. Use the generic scsi interface. */
>     static int handle_scsi_cmd(unsigned cmd_len,         /* command length */
>                                unsigned in_size,         /* input data size */
>                                unsigned char *i_buff,    /* input buffer */
>                                unsigned out_size,        /* output data size */
>                                unsigned char *o_buff     /* output buffer */
>                                )
>     {
>         int status = 0;
>         struct sg_header *sg_hd;

>         /* safety checks */
>         if (!cmd_len) return -1;            /* need a cmd_len != 0 */
>         if (!i_buff) return -1;             /* need an input buffer != NULL */
>     #ifdef SG_BIG_BUFF
>         if (SCSI_OFF + cmd_len + in_size > SG_BIG_BUFF) return -1;
>         if (SCSI_OFF + out_size > SG_BIG_BUFF) return -1;
>     #else
>         if (SCSI_OFF + cmd_len + in_size > 4096) return -1;
>         if (SCSI_OFF + out_size > 4096) return -1;
>     #endif

>         if (!o_buff) out_size = 0;

>         /* generic scsi device header construction */
>         sg_hd = (struct sg_header *) i_buff;
>         sg_hd->reply_len   = SCSI_OFF + out_size;
>         sg_hd->twelve_byte = cmd_len == 12;
>         sg_hd->result = 0;
>     #if     0
>         sg_hd->pack_len    = SCSI_OFF + cmd_len + in_size; /* not necessary */
>         sg_hd->pack_id;     /* not used */
>         sg_hd->other_flags; /* not used */
>     #endif

>         /* send command */
>         status = write( fd, i_buff, SCSI_OFF + cmd_len + in_size );
>         if ( status < 0 || status != SCSI_OFF + cmd_len + in_size ||
>                            sg_hd->result ) {
>             /* some error happened */
>             fprintf( stderr, "write(generic) result = 0x%x cmd = 0x%x\n",
>                         sg_hd->result, i_buff[SCSI_OFF] );
>             perror("");
>             return status;
>         }

>         if (!o_buff) o_buff = i_buff;       /* buffer pointer check */

>         /* retrieve result */
>         status = read( fd, o_buff, SCSI_OFF + out_size);
>         if ( status < 0 || status != SCSI_OFF + out_size || sg_hd->result ) {
>             /* some error happened */
>             fprintf( stderr, "read(generic) result = 0x%x cmd = 0x%x\n",
>                     sg_hd->result, o_buff[SCSI_OFF] );
>             fprintf( stderr, "read(generic) sense "
>                     "%x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x\n",
>                     sg_hd->sense_buffer[0],         sg_hd->sense_buffer[1],
>                     sg_hd->sense_buffer[2],         sg_hd->sense_buffer[3],
>                     sg_hd->sense_buffer[4],         sg_hd->sense_buffer[5],
>                     sg_hd->sense_buffer[6],         sg_hd->sense_buffer[7],
>                     sg_hd->sense_buffer[8],         sg_hd->sense_buffer[9],
>                     sg_hd->sense_buffer[10],        sg_hd->sense_buffer[11],
>                     sg_hd->sense_buffer[12],        sg_hd->sense_buffer[13],
>                     sg_hd->sense_buffer[14],        sg_hd->sense_buffer[15]);
>             if (status < 0)
>                 perror("");
>         }
>         /* Look if we got what we expected to get */
>         if (status == SCSI_OFF + out_size) status = 0; /* got them all */

>         return status;  /* 0 means no error */
>     }

>     #define INQUIRY_CMD     0x12
>     #define INQUIRY_CMDLEN  6
>     #define INQUIRY_REPLY_LEN 96
>     #define INQUIRY_VENDOR  8       /* Offset in reply data to vendor name */

>     /* request vendor brand and model */
>     static unsigned char *Inquiry ( void )
>     {
>       unsigned char Inqbuffer[ SCSI_OFF + INQUIRY_REPLY_LEN ];
>       unsigned char cmdblk [ INQUIRY_CMDLEN ] =
>           { INQUIRY_CMD,  /* command */
>                       0,  /* lun/reserved */
>                       0,  /* page code */
>                       0,  /* reserved */
>       INQUIRY_REPLY_LEN,  /* allocation length */
>                       0 };/* reserved/flag/link */

>       memcpy( cmd + SCSI_OFF, cmdblk, sizeof(cmdblk) );

>       /*
>        * +------------------+
>        * | struct sg_header | <- cmd
>        * +------------------+
>        * | copy of cmdblk   | <- cmd + SCSI_OFF
>        * +------------------+
>        */

>       if (handle_scsi_cmd(sizeof(cmdblk), 0, cmd,
>                           sizeof(Inqbuffer) - SCSI_OFF, Inqbuffer )) {
>           fprintf( stderr, "Inquiry failed\n" );
>           exit(2);
>       }
>       return (Inqbuffer + SCSI_OFF);
>     }

>     #define TESTUNITREADY_CMD 0
>     #define TESTUNITREADY_CMDLEN 6

>     #define ADD_SENSECODE 12
>     #define ADD_SC_QUALIFIER 13
>     #define NO_MEDIA_SC 0x3a
>     #define NO_MEDIA_SCQ 0x00
>     int TestForMedium ( void )
>     {
>       /* request READY status */
>       static unsigned char cmdblk [TESTUNITREADY_CMDLEN] = {
>           TESTUNITREADY_CMD, /* command */
>                           0, /* lun/reserved */
>                           0, /* reserved */
>                           0, /* reserved */
>                           0, /* reserved */
>                           0};/* reserved */

>       memcpy( cmd + SCSI_OFF, cmdblk, sizeof(cmdblk) );

>       /*
>        * +------------------+
>        * | struct sg_header | <- cmd
>        * +------------------+
>        * | copy of cmdblk   | <- cmd + SCSI_OFF
>        * +------------------+
>        */

>       if (handle_scsi_cmd(sizeof(cmdblk), 0, cmd,
>                                 0, NULL)) {
>           fprintf (stderr, "Test unit ready failed\n");
>           exit(2);
>       }

>       return
>        *(((struct sg_header*)cmd)->sense_buffer +ADD_SENSECODE) !=
>                                                             NO_MEDIA_SC ||
>        *(((struct sg_header*)cmd)->sense_buffer +ADD_SC_QUALIFIER) !=
>                                                             NO_MEDIA_SCQ;
>     }

>     void main( void )
>     {
>       fd = open(DEVICE, O_RDWR);
>       if (fd < 0) {
>         fprintf( stderr, "Need read/write permissions for "DEVICE".\n" );
>         exit(1);
>       }

>       /* print some fields of the Inquiry result */
>       printf( "%s\n", Inquiry() + INQUIRY_VENDOR );

>       /* look if medium is loaded */
>       if (!TestForMedium()) {
>         printf("device is unloaded\n");
>       } else {
>         printf("device is loaded\n");
>       }
>     }

> `