Pioneer SCSI-2 - Manual (Page 42)

Mode Select(10)
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2.6 Mode Select(10) (55h)
The MODE SELECT(10) command provides a range for the initiator specifying specific
operating parameters. Refer to MODE SELECT(6) Command, Section 2.5 for details of the
command fields.
IMPORTANT: Initiators should issue the MODE SENSE command (reference Sections 2.7
and 2.8) prior to each execution of the MODE SELECT command to determine supported pages,
page lengths and other parameters.