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SCSI Description
Maxtor Atlas 10K III 5-41
SCSI refers to the drive’s operational parameters as its mode parameters. SCSI groups the
mode parameters by function into a set of data structures referred to as mode pages. The
MODE SELECT (6) command allows the initiator to modify some of these mode
pages and thereby control some of the drive’s operational characteristics. The Save
Page (SP) option in the Command Descriptor Block makes the changes permanent.
The new mode parameters are then stored in the drive’s non-volatile memory. The
MODE SELECT CDB is described in Table 5-51 and a description of the fields in
Table 5-52.
MODE SELECT (6) Command Descriptor Block-Data Format
MODE SELECT (6) Command Field Descriptions
0 Operation Code (15h)
1 Reserved PF Reserved SP
2 – 3 Reserved
4 Parameter Length List
5 Control
PF
Page Format. The drive ignores the content of this field and produc-
es a mode parameter list that contains a mode header optionally
followed by a sector descriptor and one or more pages that con-
form to the format shown here.
SP
Save Pages. When SP = 0, the drive performs the specified MODE
SELECT operation and does not save any pages. When SP = 1, the
drive performs the specified operation and stores all savable pages,
(PS =1 on MODE SENSE return) including any sent during the data-
out buffer transfer. The changes made when SP = 1 become per-
manent changes to the drive’s SCSI setup.
Parameter List Length
This field tells the drive how many bytes of Mode Parameters to
fetch in the data-out buffer transfer. A CHECK CONDITION status
is returned if this value truncates a page.