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3.1 Control/Sense Commands
C141-E167 3 -
5
a. Qualifier field
(0,0,0): The specified logical unit shows the type of input/output device shown in the "Device
Type Code" field. Even if this code is reported, it does not mean that that logical unit is
in the ready state.
(0,0,1): The specified logical unit shows the type of input/output device shown in the "Device
Type Code" field, but it shows that an actual input/output device is not connected to that
logical unit. The IDD does not report this code.
(0,1,1): Shows that the specified logical unit is not supported. When this code is reported, it X
'1F' is shown in the "Device Type Code" field.
b. Device type code
(0,0,0,0,0): Direct access device
(1,1,1,1,1): Undefined device
When LUN=0 is specified, the IDD reports "(0,0,0,0,0) : direct access device" as the device type
code. At this time, the "Qualifier" field is "(0,0,0)." Therefore, byte 0 indicates X '00.' On the
other hand, when a LUN other than "0" is specified, the IDD reports "(1,1,1,1,1) : undefined
device" as the device type code. At this time, the "Qualifier" field is "(0,1,1)." Therefore, byte 0
indicates X '7F.'
c. RMB bit
When this bit is "1," it indicates that the storage media is a removable disk device. The IDD is a
fixed disk device, so this bit is always reported as "0."
d. Version
The VERSION field indicates the implemented version of this standard and is defined below.
Code Description
X'01' ANSI X3.131: 1986 (SCSI-1)
X'02' ANSI X3.131: 1994 (SCSI-2)
X'03' ANSI X3.301: 1997 (SPC Rev.11)
X'04' T10/1236-D (SPC-2)
e. Response data format field
This field shows the code which shows the standard INQUIRY data format. The definition of
the code is (0,0,0,1) for SCSI-1/CCS mode or (0,0,1,0) for SCSI-2 or SCSI-3 mode.
f. Additional data length
This field shows the length of the INQUIRY data (byte length) after byte 5. This value shows the
length in the INQUIRY data held by the IDD without relation to the specification in the transfer byte
length field in the CDB, and is always X‘5B’ (total data length = 96 bytes).