Inquiry Vital Product Data; Mode Sense Data - Seagate ST336706LW Product Manual

Cheetah 36ES Product Manual, Rev. A
Table 6 lists the Standard Inquiry command data that the drive should return to the initiator per the format given
in the SCSI Interface Product Manual, part number 75789509, Inquiry command section.
Table 6: Cheetah 36ES family drive Standard Inquiry data
Bytes Data (HEX)
0-15 00 00 [03]
16-31 53 54 [33]
32-47 R# R# R#
48-63 00 00 00
64-79 00 00 00
80-95 00 00 00
96-111 00 43 6F
112-127 [30] [30] [31]
128-143 72 69 67
1
[ ] 03 means SCSI-3 (Ultra160) implemented.
2
[ ] 02 means response data in SCSI-3 (Ultra160) format. In addition, 12 indicates that the drive uses the hier-
archical addressing mode to assign LUNs to logical units (default is 12).
R# Four ASCII digits representing the last four digits of the product Firmware Release number. This informa-
tion is also given in the Vital Product Data page C0h, together with servo RAM and ROM release num-
bers.
S# Eight ASCII digits representing the eight digits of the product serial number.
3
[ ] Bytes 18 through 26 reflect model of drive. Shown here are hex values for Model ST336706LC.
For LW models, bytes 24, 25, and 26 are 4C 57.
For LC models, bytes 24, 25, and 26 are 4C 43.
5
[ ] Copyright Year - changes with actual year.
9.3.1

Inquiry Vital Product data

Instead of the standard Inquiry data shown in Table 6, the initiator can request several Vital Product Data
pages by setting the Inquiry command EVPD bit to one. The SCSI Interface Product Manual, part number
75789509, lists the Vital Product Data pages and describes their formats. A separate Inquiry command must
be sent to the drive for each Vital Product Data page the initiator wants the drive to send back.
9.3.2

Mode Sense data

The Mode Sense command provides a means for the drive to report its operating parameters to the initiator.
The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change-
able values.
Default values are hard coded in the drive firmware that is stored in flash EPROM nonvolatile memory on the
drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash
EPROM. An initiator can request and receive from the drive a list of default values and use those in a Mode
Select command to set up new current and saved values, where the values are changeable.
Saved values are stored on the disk media using a Mode Select command. Only parameter values that are
allowed to be changed can be changed by this method. See "Changeable values" defined below. Parameters in
the saved values list that are not changeable by the Mode Select command get their values from the default
values storage.
Current values are volatile values currently being used by the drive to control its operation. A Mode Select com-
mand can be used to change these values (only those that are changeable). Originally, they are installed from
saved or default values after a power on reset, hard reset, or Bus Device Reset message.
Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and
saved values can be changed by a Mode Select command. A "one" allows a change to a corresponding bit; a
1 [12] 2 8B 00 [01] [3E]
[33] [36] [37] [30] [36]
R# S# S# S# S#
00 00 00 0C 00
00 00 00 00 00
00 00 00 00 00
70 79 72 69 67
5
20 53 65 61 67
68 74 73 20 72
53 45 41 47 41
3
[4C] [43] 20 20 20
S# S# S# S# 00
00 00 00 00 00
00 00 00 00 00
00 00 00 00 00
68 74 20 28 63
61 74 65 20 41
65 73 65 72 76
54 45 20 VENDOR ID
20 20 20 PRODUCT ID
00 00 00
00 00 00
00 00 00
00 00 00
29 20 [32] COPYRIGHT
6C 6C 20 NOTICE
65 64 20
47