HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 128

SCSI-2 Drive Commands NOTE SCSI-2 Drive Command Set Write and Verify (Group 1) Command (2EH) DPO EBP Transfer Length PBA ErsCntl Rel Adr 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 optical disk. A DPO bit of 0 instructs the target to store the data in the cache after it has been transferred to the optical disk. This bit is ignored. An Erase By-Pass bit of 0 indicates an erase automatically performs before writing the data. An EBP bit of 1 suppresses the erase operation. 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 will be transferred and is not considered an error. 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. The Erase Control bit is identical to the Erase Bypass bit. 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. When this command is used with 14X 512 OR 1024 byte/sector media, setting the ErsCntl bit or the PBA bit will cause the drive to return a CHECK CONDITION status. The sense key/additional sense code will be set to ILLEGAL REQUEST/INVALID FIELD in CDB. Chapter 2 2-91