Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Inquiry Command (12H)
Chapter 22-30
NOTE If the drive is properly connected and responds to SCSI selection, the
Peripheral Qualifier field is set to 000. If Direct Access Inquiry Response
(DAIR) has been enabled, the Peripheral Device Type field is set 00H,
(Direct Access Device). Otherwise, the Peripheral Device Type field is set
to 07H (Optical Memory Device). Because the drive does not support
logical unit 1 through 7, an Inquiry command to these logical units always
returns 011 for the Peripheral Qualifier and 1FH (Unknown Device Type)
for the Peripheral Device Type.
RMB The Removable Media Bit is set to 1 for removable
optical disks. The drive only supports removable optical
disks, so this bit is always 1.
Device Type
Modifier The drive is not using the Device Type Modifier field
and will return 0.
ISO, ECMA and
ANSI-Approved
Versions Approved Version fields indicate compliance of the
current firmware to these standards.
Additional Sense
Length This field indicates the length in bytes of the additional
parameters. This field is always 33H.
RelAdr The Relative Addressing bit is set to 1, which indicates
that the drive supports relative addressing mode.
WBus32 The Wide Bus 32 bit of 0 indicates that the drive
supports only 8-bit wide data transfers.
WBus16 The Wide Bus 16 bit of 0 indicates that the drive
supports only 8-bit wide data transfers.
Sync The Synchronous transfer bit of 1 indicates that the
drive supports synchronous data transfer.
Linked The Linked command bit of 1 indicates that the drive
supports linked commands.
CmdQue The Command queuing bit of 1 indicates that the drive
supports tagged command queuing.
SftRe The Soft Reset bit of 0 indicates that the drive responds
to the RESET condition with the hard RESET.