HP Surestore 160ex Optical Drive and Library SCSI-2 Command Reference - Page 162
Mode Sense (Group 2) Command (5AH),
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SCSI-2 Drive Command Set Mode Sense (Group 2) Command (5AH) SCSI-2 Drive Commands Table 2-119 Mode Sense (Group 2) Command (5AH) Mode Select (Group 2) Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (5AH) 1 Logical Unit Number Rsvd DBD (0) (0) Reserved (0) 2 PC Page Code 3-6 Reserved (0) 7 Allocation Length (MSByte) 8 Allocation Length (LSByte) 9 Reserved (0) Flag Link DBD PC Page Code Allocation Length A disable block descriptors (DBD) bit of 0 (default) indicates that block descriptors are 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 (Group 0) command. If the page code is specified as 00H or 3FH, all the pages are returned. Indicates the number of bytes that the indicator has allocated for return of this data. A length of 0 indicates that no data will be returned. This condition is not considered an error. The drive will terminate the data in phase when the allocation length has been transferred or when all available data has been transferred to the initiator, whichever is less. Chapter 2 2-125