User Manual
SCSI Commands Reference Manual, Rev. J 494
www.seagate.com Parameters for direct access devices
IDENTIFIER LENGTH field
The IDENTIFIER LENGTH field specifies the length in bytes of the IDENTIFIER field. If the ALLOCATION LENGTH field of the command descriptor
block is too small to transfer all of the identifier, the identifier length shall not be adjusted to reflect the truncation.
IDENTIFIER field
The IDENTIFIER field contains the identifier as described by the Association, Identifier Type, CODE SET, and IDENTIFIER LENGTH fields. The
example described in this clause and shown in Table
464 is not a normative part of this manual. This example of a complete device identifica-
tion VPD page assumes that the product is a direct-access device with an T10 Vendor ID of “XYZ_Corp,” a product identification of “Super Turbo
Disk,” and a product serial number of “2034589345.” Furthermore, it is assumed that the manufacturer has been assigned a 24-bit IEEE compa
-
ny_id of 01ABCDh by the IEEE Registration Authority Committee and that the manufacture has assigned a 24-bit extension_identifier of
234567h to this logical unit. The combined 48-bit identifier is reported in the 64-bit format as defined by the IEEE 64-bit Global Identifier
(EUI-64) standard. The data returned in the device identification VPD page for this logical unit is shown in Table
464.
Table 464 Device Identification page example
Bytes Hexadecimal values ASCII values
00–15
16–31
32–47
48–53
00
53
32
CD
83
75
30
FF
00
70
33
FF
32
65
34
23
02
72
35
45
01
20
38
67
00
54
39
22
75
33
58
72
34
59
62
35
5A
6F
01
5F
20
02
43
44
00
6F
69
08
72
73
01
70
6B
AB
...2...XYZ_Corp [5]
Super Turbo Disk
2034589345.......
......
Notes.
a) Non-printing ASCII characters are shown as “.”.
b) Byte 00 is the beginning of the VPD page (see table 437).
c) Byte 04 is the beginning of the Identification descriptor for the Vendor ID based identifier (Identifier type 1 see Table 463).
d) Byte 42 is the beginning of the Identification Descriptor for the EUI-64 identifier (Identifier type 2, see Table 463).
e) For Seagate devices, this will say “Seagate.”