User's Guide

Page 42 DDS-4 SCSI Interface Manual, Rev. B
Standard INQUIRY Data Format
The following table shows the standard data format for the INQUIRY command.
Byte
Bits
7 6 5 4 3 2 1 0
0 Peripheral Device Type
1 1 0 0 0 0 0 0 0
2 0 0 0 0 0 | ANSI Version (2)
3 0 0 0 0 0 0 1 0
4 Additional Length (1Fh)
5 0 0 0 0 0 0 0 0
6 0 0 0 0 0 0 0 Addr16
7 0 0 1 1 1 0 0 0
8 - 15 MSB—Vendor Identification
Vendor Identification—LSB
16 - 27 Product Name*
28 - 31 Product Revision Level*
32 - 35 Firmware Version*
* Indicates Seagate-specific field definitions. In the SCSI standard, bytes 16-31 are
grouped as “Product Identification”, and bytes 32-35 are captioned “Product
Revision Level”.
Standard INQUIRY Data Format Field Descriptions
The following table describes the data format fields.
Field Name Bytes Bits Description
Peripheral Device
Type
0 0-7 This field is set to 01h to indicate a sequential access device.
This field is set to 08h to indicate a medium changer device if
the drive is an Autoloader and the LUN=1.
Value 7Fh indicates that a logical unit is not present. This
value is returned in the case where an invalid LUN was
contained in the last Identify message sent by the Initiator.
ANSI Version 2 0-2 This field contains 2 in compliance with ANSI standard SCSI-
2. The field may contain 3 for drives that are ANSI 2/3
compliant.
Additional Length 4 This field indicates that 31 bytes of additional INQUIRY
command parameters follow—beginning in Byte 05h. This
value is not changed if the Allocation Length in the CDB is too
small or too large to accommodate the entire response.
Addr16 6 0 The Addr16 field contains 1, indicating that the device supports
16-bit wide SCSI addresses, (SCSI-3)
Vendor
Identification
8-15 This field contains 8 bytes of ASCII data: SEAGATE followed
by 1 space.
Product Name 16-27 This field contains 12 bytes of ASCII data: “DAT” followed by
four spaces followed by “DAT72”
Product Revision
Level
28-31 This field contains 4 bytes of ASCII data: "-xxx" the xxx is the
3-digit firmware revision part number; for example, "-001".
Firmware Version 32-35 This field contains the firmware version.
Note – See product manual # xxxxxxxxxxxx for details of alternate Inquiry data for
Vendor ID and Product Name.