Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Write (Group 0) Command (0AH)
Chapter 22-24
Transfer Length The Transfer Length field specifies the number of
contiguous logical blocks of data to be written. A
Transfer Length of 0 specifies that 256 logical blocks are
to be written.
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 If the Erase Control bit is set to 0, an erase is
automatically performed before writing the data.
An Erase Control bit of 1 suppresses the erase
operation.
NOTE When this command is used with 512 byte/sector 4X/ 8X/14X media, 1024
byte/sector 8X/14X media, or 2048 14X media, it is not possible to address
all logical blocks on the disk because those media types contain >2
21
logical blocks.
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.
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.