HP Surestore 160fx Optical Drive and Library SCSI-2 Command Reference - Page 110
Start/Stop Unit Command (1BH),
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SCSI-2 Drive Command Set Start/Stop Unit Command (1BH) SCSI-2 Drive Commands Table 2-62 NOTE Start/Stop Unit Command (1BH) This command starts or stops rotation of the optical disk in the drive and/or ejects the optical disk from the drive. Start/Stop Unit Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (1BH) 1 Logical Unit Number (0) Reserved (0) Immed 2 Reserved (0) 3 Reserved (0) 4 Reserved (0) LoEj Start 5 Reserved (0) Flag Link Immed LoEj An Immediate bit of 1 indicates that status is returned as soon as the command descriptor block has been validated. An Immed bit of 0 indicates that status is returned after the operation is completed. A Load Eject bit of 0 requests that no action be taken regarding loading or ejecting the media. A Load Eject bit of 1 indicates that the media will be unloaded if the Start bit is 0. A Load Eject bit of 1 indicates that the media will be loaded if the Start bit is 1. This command is affected by the Prevent/Allow Medium Removal command. Do not use LoEj in an autochanger environment. Start A Start bit of 1 indicates that the drive starts rotating the optical disk. A Start bit of 0 indicates that the drive stops rotating the optical disk. Chapter 2 2-73