Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Write and Verify (Group 5) Command (AEH)
Chapter 22-138
EBP 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.
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 indicates the number of
contiguous logical blocks to be transferred for this
command. A value of 0 indicates that no blocks 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.
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 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.