hdparm

tune hard disk parameters for high performance
  http://sourceforge.net/projects/hdparm/
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Get/set device parameters for Linux SATA/IDE drives. Provides a command line interface to various kernel interfaces supported by the Linux SATA/PATA/SAS "libata" subsystem and the older IDE driver subsystem. Many newer (2008 and later) USB drive enclosures now also support "SAT" (SCSI-ATA Command Translation) and therefore may also work with hdparm.