Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Write (Group 5) Command (AAH)
Chapter 22-132
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 will be
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 If the Erase By-Pass bit is set to 0, an erase is
automatically performed before writing the data.
An EBP bit of 1 suppresses the erase operation.
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.