Mode; Mode Parameter List - Maxtor ATLAS 10K IV User Manual

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 5-52.
Page Type
The current mode page set applies to all initiators and defines the drive's mode. The SCSI-2 spec-
ification 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 re-
ceived from an initiator. If no initiator has sent a MODE SELECT command since the drive was
Current 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.
The default mode page set contains the factory default values that are listed in each page's descrip-
Default
tion.
The saved mode page set contains values preserved in the drive's non-volatile memory by a pre-
Saved
vious SP-modified MODE SELECT command.
The changeable mode page set provides a means for an initiator to determine which pages it is
Changeable 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

Table 5-53 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 5-54 describes the
fields. Table 5-55 and Table 5-56 provides a description of the data format and fields
of the Mode Parameter Header. Table 5-57 and Table 5-58 describe the format and
field descriptions for the Mode Parameter Block Descriptor.
Bit
Byte
0 – 3
4 – 11
4 – n
or
12 – n
Mode Page Types
Table 5-52
Mode Parameter List-Data Format
Table 5-53
7 6 5
Definition
4 3
Mode Parameter Header
Block Descriptor
(optional)
Page(s)
(optional)
Maxtor Atlas 10K IV
SCSI Description
2 1 0
5-39