HP 2600fx - Optical Disk Drive Command Reference Manual page 99

NOTE
SCSI-2 Drive Command Set
Mode Sense (Group 0) Command (1AH)
MaximumPre-fetch
Ceiling The Maximum Pre-fetch Ceiling filed does not affect the
operation of the drive and can be set to 32 or 64. In
another value is set, a CHECK CONDITION status is
returned with the sense key/ additional sense code set to
ILLEGAL REQUEST/Invalid Parameter List.
With write caching enabled, data integrity of the information in the buffer
is not guaranteed through power cycling.
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