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Definition: RAID controller

A controller card that supports one or more RAID configurations. Originally only for SCSI drives, RAID controllers became very popular for PATA, SATA and NvMe drives. See RAID.

Four-Port RAID Controller
This RAID controller supports four SATA drives in a RAID 0, 1, 5 or 10 configuration. If a drive fails and another one is designated as a hot spare, the controller uses its on-board memory to automatically rebuild the data on the spare. (Image courtesy of Promise Technology, Inc., www.promise.com)