Pioneer SCSI-2 - Manual (Page 62)

Medium Types Supported Page
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2.9.4 Medium Types Supported Page
PS (Parameters Savable)
The Parameters Savable bit is only used with the MODE SENSE command. This bit
is reserved with the MODE SELECT command. A PS bit of one indicates that the
target is capable of saving the page in a non-volatile vendor specific location.
The code values for each medium type supported by the target (up to four maximum),
as defined in the MODE SELECT command are reported in ascending order. If only
the default medium type is supported zero is reported. If less than four medium types
are supported the unused entries shall be returned as zero.