Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Erase (Group 5) Command (ACH)
Chapter 2 2-135
SCSI-2 Drive Commands
NOTE 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.
NOTE 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 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.
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.
Transfer
Length 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.
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.