Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Write and Verify (Group 1) Command (2EH)
Chapter 2 2-91
SCSI-2 Drive Commands
DPO 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.
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.
Transfer
Length 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.
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.
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.
NOTE 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.