sdparm: An utility for listing and potentially changing SCSI disk parameters.
sdparm: 
sdparm: More generally it can be used on any device that uses
sdparm: a SCSI command set. Apart form SCSI disks, examples of devices that
sdparm: use SCSI command sets are ATAPI CD/DVD drives, SCSI and ATAPI tape
sdparm: drives and SCSI enclosures.
sdparm: 
sdparm: http://sg.danny.cz/sg/sdparm.html