HP Surestore 200fx Optical Drive and Library SCSI-2 Command Reference - Page 159
Mode Select (Group 2) Command (55H),
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SCSI-2 Drive Command Set Mode Select (Group 2) Command (55H) Table 2-116 Mode Select (Group 2) Command (55H) This command sets optical disk, drive unit, or controller unit parameters. Mode Select (Group 2) Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (55H) 1 Logical Unit Number PF Reserved (0) SP (0) (1) 2 Reserved (0) 3 Reserved (0) 4 Reserved (0) 5 Reserved (0) 6 Reserved (0) 7 Parameter List Length (MSByte) 8 Parameter List Length (LSByte) 9 Reserved (0) Flag Link SP A Save Pages bit of 1 indicates that the target performs the specified MODE SELECT operation, and saves all the savable pages to non-volatile RAM. The pages are only saved if different from those currently saved. A Save Pages bit of 0 indicates the target performs the specified MODE SELECT operation, and does not save any pages. 2-122 Chapter 2