HP 2600fx - Optical Disk Drive Command Reference Manual page 166

DPO
NOTE The DPO bit is ignored in 9.1 and 5.2 Gbyte capacity drives.
FUA
Rel Adr
Transfer
Length
PBA
For Write-Once optical disks, blank checking is performed following a
NOTE
failed read. If the sector is blank, the sense key/additional sense code will
be set to BLANK CHECK/Blank Sector Detected.
Chapter 2
A Disable Page Out bit of 1 instructs the target not to
store readahead data in cache after the read data has
been transferred to the initiator.
A DPO bit of 0 instructs the target it may store
readahead data in the cache after the read data has
been transferred to the initiator.
A Force Unit Access bit of 1 indicates that the drive
reads from the disk.
An FUA bit of 0 indicates that data may come from the
cache memory.
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.
The Transfer Length field specifies the number of
contiguous logical blocks of data to be transferred.
A value of 0 indicates that no blocks will be transferred
and is not considered an error.
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.
SCSI-2 Drive Command Set
Read (Group 5) Command (A8H)
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