Page
22
LTO SCSI Interface Manual
INQUIRY
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.
Command Descriptor Block
Byte
Bits
7
6
5
4
3
2
1
0
0
Operation Code (12h)
1
Ignored
Reserved
EVPD
2
Page Code
3
Reserved
4
Allocation Length
5
Control
Field Descriptions
Field
Bytes
Bits
Description
Operation
Code
0
The Operation Code for Inquiry is 12h.
Ignored
Logical
Unit
1
5-7
The LUN field is residual from the SCSI-1 days and is ignored.
EVPD
1
0
0 = Requests Standard Inquiry Data.
1 = Requests data page specified by the Page Code.
Page
Code
2
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
Allocation
Length
4
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.
Reserved
All reserved bits must be 0.
Control
5
See Control Byte Format on page 18.
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,
