SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–37
INQUIRY Command (12h) (continued)
Table 5–13 Standard Inquiry Data Page — Field Descriptions (continued)
Field Name Value Description
Clocking 11
The contents of this field define the setting of the double-edge
clocking option (See Chapter 6). Note that the clocking field does not
apply to asynchronous transfers of data. Options available are:
Code Description
00b Indicates the device server supports only Single Transition (ST)
01b Indicates the device server supports only Double Transition
(DT)
10b Reserved
11b Indicates the device server supports ST and DT
QAS
0
Quick Arbritrate Support. If the value of this field is 1, it indicates that
the device server supports the quick arbitrate feature. A value of 0
indicates that the device server does not support this feature. 0 is
default setting.
IUS
0
Information Unit Supported. If the value of this field is 1, it indicates
that the device server supports information units. A value of 0 indicates
that the device server does not support information units. Default is 0.
5.11.2 Vital Product Data Pages
The Vital Product Data pages that can be returned by the drive are described in the
following paragraphs in the sequence shown in Table 5-14.
5.11.2.1 Supported Vital Product Data Pages Page (00h)
The Supported Vital Product Data Pages page (Figure 5-12) provides a directory of
the Vital Product Data Pages that are supported by the drive. Table 5-14 lists the
supported pages.
Bit
Byte
7 6 5 4 3 2 1 0
0 Peripheral Qualifier
= 0
Peripheral Device Type = 0
(Direct Access Device)
1 Page Code (00h)
2 Reserved
3 Page Length = 08h
4 - 10 Supported Page List
(see Table 5-14)
Figure 5–12 Supported Vital Product Data Pages Page — Data Format
Table 5–14 Vital Product Data — Page Codes
Page Code Description Size In Bytes
00h Supported Vital Product Pages Page 11
80h Unit Serial Number Page 16
81h Implemented Operating Definition Page 9
82h ASCII Implemented Operating Page 32
83h Device Identification Page 28
C0h Firmware Revision Page 40
C1h Quantum Manufacturing Number Page 20
C4h Negotiated Rate Information Page 8
