Table; Mode Select (6) Command Descriptor Block-Data Format; Mode Select (6) Command Field Descriptions - Maxtor ATLAS 10K III Product Manual

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.

T a b l e 5 - 5 1 MODE SELECT (6) Command Descriptor Block-Data Format
$ K V
 
$ [ V G
0
1 Reserved
2 – 3
4
5
T a b l e 5 - 5 2 MODE SELECT (6) Command Field Descriptions
& C V C ( K G N F
PF
SP
Parameter List Length
 
Operation Code (15h)
PF
Reserved
Parameter Length List
Control
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.
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.
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.
  
Reserved
& G U E T K R V K Q P
Maxtor Atlas 10K III
SCSI Description

SP
5-41