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RAID uses additional hard disks to improve performance, add reliability, or both simultaneously.
Of course, a large part of making RAID affordable lies not only in reducing the cost of the controller itself, but in making it compatible with cheaper hard disks. SCSI RAID controllers have been available for quite some time, but most users cannot afford a single SCSI drive, let alone multiple drives. The next logical step in making RAID affordable would be an IDE RAID controller. That in mind, last year Promise Technology introduced its FastTrak. Of course, it was bound not to be alone, and Iwill has recently announced sIDE RAID66, an UltraDMA-66 IDE RAID controller.