HP Surestore 80ex Optical Drive and Library SCSI-2 Command Reference - Page 172
Erase Group 5 Command ACH,
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SCSI-2 Drive Commands NOTE NOTE SCSI-2 Drive Command Set Erase (Group 5) Command (ACH) The 9.1 and 5.2 Gbyte capacity drives cannot Format, Erase, Write, or Write and Verify 650 Mbyte and 1.3-Gbyte optical disks. The 2.6 Gbyte capacity drives cannot Format, Erase, Write, or Write and Verify 650 Mbyte optical disks. If this command is issued with any of these drive/ media combinations, a CHECK CONDITION status will result with the Sense Key/Additional Sense Code set to Data Protect/Write Protected. If this command is executed for write-once disks, the drive returns a CHECK CONDITION status with the Sense Key/Additional Sense Code set to Illegal Request/Invalid Command Operation Code. ERA Rel Adr Transfer Length PBA An Erase All bit of 1 indicates that all remaining blocks are erased, starting from the logical block address to the end of the disk. The transfer length must be set to 0. An ERA bit of 0 indicates that all blocks are erased, starting from the logical block address to the end of the specified transfer length. 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. The Transfer Length field specifies the number of contiguous logical blocks of data to be erased for this command. A value of 0 indicates that no blocks will be erased 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. Chapter 2 2-135