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Page 22
INQUIRY
Command Descriptor Block
Field Descriptions
The Inquiry command requests that the drive return information about itself. If an
Inquiry command is received from an Initiator with a pending Unit Attention Condition
(before the drive reports Check Condition status), the drive performs the Inquiry
command and does not clear the Unit Attention Condition.
Bits
Byte
7
6
0
1
Ignored
2
3
4
5
Field
Bytes
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
EVPD
1
0
Page
2
Code
Allocation
4
Length
Reserved
Control
5
If the Enable Vital Product Data (EVPD) flag is clear and the Page Code is zero,
Standard Inquiry Data is returned. If the Enable Vital Product Data (EVPD) flag is set
and the Page Code is zero, the Supported Vital Product Data Pages page is
returned.
If the Enable Vital Product Data (EVPD) flag is set and the Page Code is not zero
and there is a vendor defined Inquiry data page corresponding to that page code,
5
4
3
Operation Code (12h)
Reserved
Page Code
Reserved
Allocation Length
Control
Description
The Operation Code for Inquiry is 12h.
The LUN field is residual from the SCSI-1 days and is ignored.
0 = Requests Standard Inquiry Data.
1 = Requests data page specified by the Page Code.
00h = Requests Supported Vital Product Data Page
80h = Requests Unit Serial Number Page
83h = Requests Device Identification Page
C0h = Requests SCSI Firmware Revision Page
C1h = Requests Servo Firmware Revision Page
C2h = Requests Head Assembly Serial Number Page
C3h = Requests Reel Motor 1 Serial Number Page
C4h = Requests Reel Motor 2 Serial Number Page
C5h = Requests Board Serial Number Page
C6h = Requests Base Mechanical Serial Number Page
DFh = Requests Drive Status Page
Specifies the amount of data to be returned, in bytes. A value of 0
is a valid entry and returns no data.
The drive transfers the number of bytes specified up to a maximum
of 38h for Standard Inquiry.
All reserved bits must be 0.
See Control Byte Format on page 18.
LTO SCSI Interface Manual
2
1
0
EVPD
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