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## 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                                                                   |
>     +=============================================================================+

> `

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