Seagate ST3285N, Product Manual

Page: 128 / 151

D.2 Vital product data pages
When the initiator issues an Inquiry command, and the EVPD bit in byte 1
of the Inquiry command descriptor block is 1, the drive returns vital
product data pages. If the EVDP bit in byte 1 of the Inquiry command
descriptor block is 0, see Appendix D.1.
All vital product data pages contain a 4-byte header, shown below.
Bit
Byte
7 6 5 4 3 2 1 0
0 Peripheral qualifier Peripheral device type
1 Page code
2 Reserved (00
H
)
3 Page length
Byte 0 The
peripheral qualifier field contains zero, which means that the
drive is currently connected to the logical unit issuing the Inquiry
command.
The peripheral device type field contains zero, which means that
the drive is a direct access device.
Byte 1 The page code field contains the same value contained in the
page code field in byte 2 of the Inquiry command descriptor
block.
If the page code field contains any of the page codes shown in
the table below, the drive returns the corresponding page. The
available page codes are:
Page code Description
00
H
Supported vital product data pages
80
H
Unit serial number page
81
H
Implemented operating definitions page
C0
H
Firmware numbers page (vendor-unique)
C1
H
Data code page (vendor-unique)
C2
H
Jumper settings page (vendor-unique)
Byte 2 Reserved
Byte 3 The
page length field contains the length of the supported page
list.
118 ST3655 Family SCSI Drives Product Manual, Rev. A