HP Surestore 660ex Optical Drive and Library SCSI-2 Command Reference - Page 91
Mode Sense (Group 0) Command (1AH),
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SCSI-2 Drive Command Set Mode Sense (Group 0) Command (1AH) Table 2-47 Mode Sense (Group 0) Command (1AH) This command is used to acquire optical disk, drive, and drive controller parameters. Mode Sense (Group 0) Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (1AH) 1 Logical Unit Number Rsvd DBD (0) (0) Rsvd (0) 2 PC Page Code (Table 2-50 on page 2-56) 3 Reserved (0) 4 Allocation Length 5 Reserved (0) Flag Link DBD PC Page Code A Disable Block Descriptors bit of 1 indicates that no block descriptor is provided. A DBD bit of 0 indicates that the block descriptor is provided. Page control defines the type of parameter values to be returned as follows: 00 - Current Values 01 - Changeable Values 10 - Default Values 11 - Saved Values Page code values are the same as for the Mode Select command. If 00H or 3FH is specified, all pages are returned. 2-54 Chapter 2