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SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
5–61
MODE SELECT (6) Command (15h) (continued)
5.14.2 Mode Page Types
The drive maintains three distinct sets of mode pages. They are the
current page
, the
default page
, and the
saved page
. The drive also reports a fourth set of
changeable
pages. The page types are defined in Table 5-27.
Table 5–27 Mode Page Types
Page Type
Definition
Current
The
current
mode page set applies to all
initiators
and defines the drive’s mode. The
SCSI-2 specification states that a drive can maintain Mode parameters on a per-
initiator basis if it so chooses. The Drives do not support this option.
The
current
mode page set contains the values supplied in the last MODE SELECT
command received from an initiator. If no initiator has sent a MODE SELECT
command since the drive was last reset or powered up, the current pages contain
•
Saved
values if saved pages exist (from a previous MODE SELECT command SP
parameter).
•
Default
values if pages have never been saved.
The drives generate a Unit Attention condition for all initiators (except for the one
that was the source of the MODE SELECT command) whenever one initiator
modifies the Mode parameters.
Default
The
default
mode page set contains the factory default values that are listed in each
page’s description.
Saved
The
saved
mode page set contains values preserved in the drive’s non-volatile
memory by a previous SP-modified MODE SELECT command.
Changeable
The
changeable
mode page set provides a means for an initiator to determine which
pages it is allowed to change and the specific bits within those pages that it is
allowed to change. This page set is read-only and is fetched with a MODE SENSE
command.
5.14.3 Mode Parameter List
Figure 5-25 shows the format of the Mode Parameter List that is passed by the
initiator to the drive during the command’s data-out buffer transfer. Table 5-28
describes the fields. Figure 5-26 and Table 5-29 provides a description of the data
format and fields of the Mode Parameter Header.
Bit
Byte
7
6
5
4
3
2
1
0
0 – 3
Mode Parameter Header
4 – 11
Block Descriptor
(optional)
4 – n
or
12 – n
Page(s)
(optional)
Figure 5–25 Mode Parameter List — Data Format
Summary of Contents for Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB
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Page 321: ...Appendix A Quick Reference A 6 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 363: ...Appendix B SCSI Bus Signal Timing B 42 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 369: ...Index I 4 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
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