13. Command Descriptions for Read-Only Direct-Access Devices

13.1 Group 0 Commands for Read-Only Direct-Access Devices.  The Group 0 
commands for read-only direct-access devices shall be as shown in Table 13-1.

                                  Table 13-1
             Group 0 Commands for Read-Only Direct-Access Devices

==============================================================================
Operation
  Code      Type   Command Name                       Section
------------------------------------------------------------------------------
   00H       O     TEST UNIT READY                    7.1.1
   01H       O     REZERO UNIT                        8.1.1
   02H       V
   03H       M     REQUEST SENSE                      7.1.2
   04H       R
   05H       V
   06H       V
   07H       R
   08H       O     READ                               12.1.1
   09H       V
   0AH       R
   0BH       O     SEEK                               8.1.6
   0CH       V
   0DH       V
   0EH       V
   0FH       V
   10H       V
   11H       V
   12H       E     INQUIRY                            7.1.3
   13H       V
   14H       V
   15H       O     MODE SELECT                        12.1.3
   16H       O     RESERVE                            8.1.8
   17H       O     RELEASE                            8.1.9
   18H       O     COPY                               7.1.4
   19H       V
   1AH       O     MODE SENSE                         12.1.4
   1BH       O     START/STOP UNIT                    8.1.11
   1CH       O     RECEIVE DIAGNOSTIC RESULTS         7.1.5
   1DH       O     SEND DIAGNOSTIC                    7.1.6
   1EH       O     PREVENT/ALLOW MEDIUM REMOVAL       8.1.12
   1FH       R
==============================================================================

Key: M  =  Command implementation is mandatory.
     E  =  Command implementation is required for SCSI devices that support 
           device-independent self-configuring software.
     O  =  Command implementation is optional.
     R  =  Operation code is reserved for future standardization.
     V  =  Operation code is available for vendor unique commands.



13.2 Group 1 Commands for Read-Only Direct-Access Devices.  The Group 1 
commands for read-only direct-access devices shall be as shown in Table 13-2.

                                  Table 13-2
             Group 1 Commands for Read-Only Direct-Access Devices

==============================================================================
Operation
  Code      Type   Command Name                       Section
------------------------------------------------------------------------------
   20H       V
   21H       V
   22H       V
   23H       V
   24H       V
   25H       E     READ CAPACITY                      8.2.1
   26H       V
   27H       V
   28H       M     READ                               12.2.1
   29H       V
   2AH       R
   2BH       O     SEEK                               8.2.4
   2CH       V
   2DH       V
   2EH       R
   2FH       O     VERIFY                             12.2.4
   30H       O     SEARCH DATA HIGH                   8.2.7.1
   31H       O     SEARCH DATA EQUAL                  8.2.7.2
   32H       O     SEARCH DATA LOW                    8.2.7.3
   33H       O     SET LIMITS                         8.2.8
   34H       R
   35H       R
   36H       R
   37H       R
   38H       R
   39H       O     COMPARE                            7.2.1
   3AH       O     COPY AND COMPARE                   7.2.2
   3BH       R
   3CH       R
   3DH       R
   3EH       R
   3FH       R
==============================================================================

Key: M  =  Command implementation is mandatory.
     E  =  Command implementation is required for SCSI devices that support 
           device-independent self-configuring software.
     O  =  Command implementation is optional.
     R  =  Operation code is reserved for future standardization.
     V  =  Operation code is available for vendor unique commands.





