Maxtor 10K III Mode Select 6 Command Descriptor Block-Data Format, Operation Code 15h Reserved

SCSI Description

￿￿￿￿/1&'SCSI￿5'refers.'%6to the￿￿￿￿￿drive%QOOCPF’s operational￿￿￿￿parametersJ￿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 5-51and a description of the fields in Table -52.

MODE SELECT (6) Command Descriptor Block-Data Format

0		Operation Code (15h)
	Reserved		Reserved	SP
2 – 3		Reserved
4		Parameter Length List
		Control

$[VG$KV	￿	MODE￿		SELECT￿	(6)￿Command￿Field Descriptions￿	￿	￿
			Page Format. The drive ignores the content of this field and produc-
&CVCPF￿(KGNF			es a mode parameter list that&GUETKRVKQPcontains a mode header optionally
			followed by a sector descriptor and one or more pages that con-
			form to the format shown here.
Table5SP-51			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
	Table5-52
			is returned if this value truncates a page.

Maxtor Atlas 10K III 5-41