Internal Program Version: sdparm  1.12

SCSI disk parameters are held in mode pages. This utility lists or
changes those parameters. Other SCSI devices (or devices that use the
SCSI command set) such as CD/DVD and tape drives may also find parts of
sdparm useful. Requires the linux kernel 2.4 series or later. In the
2.6 series any device node the understands a SCSI command set may be
used (e.g. /dev/sda). In the 2.4 series SCSI device node may be used.

Warning: It is possible (but unlikely) to change SCSI disk settings
such that the disk stops operating or is slowed down. Use with care.

http://sg.danny.cz/sg/sdparm.html