HP Surestore 1200ex Optical Drive and Library SCSI-2 Command Reference - Page 122
Write Group 1 Command 2AH, Rel Adr, Transfer Length, ErsCntl
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NOTE SCSI-2 Drive Command Set Write (Group 1) Command (2AH) DPO A Disable Page Out bit of 1 instructs the target not to store the data in the cache after it has been transferred to the media. A DPO bit of 0 instructs the target to store data in the cache after it has been transferred to the media. This bit is ignored. FUA A Force Unit Access bit of 1 indicates that data is written directly to the disk. An FUA bit of 0 indicates that write caching is allowed. Rel Adr A relative address bit of one indicates that logical block address specified is a two's complement offset from the last logical block address accessed. A value of 0 indicates that the logical block address is an absolute address. EBP An Erase By-Pass bit of 0 indicates an erase is automatically performed before writing the data. An EBP bit of 1 suppresses the erase operation. Transfer Length The Transfer Length field specifies the number of contiguous logical blocks of data to be transferred for this command. A value of 0 indicates that no blocks of data will be transferred and is not considered an error. PBA A Physical Block Address bit of 1 indicates that physical block addressing is used. A PBA bit of 0 indicates that logical block addressing is used. ErsCntl The Erase Control bit is identical to the Erase Bypass bit. For write-once optical disks, blank checking is performed before writing data. If a written block is detected during blank checking, the drive will return a CHECK CONDITION status. The sense key/additional sense code will be set to BLANK CHECK/Overwrite Attempted. Chapter 2 2-85 SCSI-2 Drive Commands