A RAID (redundant array of disk Indepedent) is a set of disk drives that appear as if they were logically a single disc. So the data, divided into bands, divided between two or more units. This technique enhances performance and provides a redundancy that protects against failure of one of the disks in the formation. There are implementations for different hardware and software RAID configurations, the most common RAID1, RAID5 and RAID10.

Product Details
Computer Organization and Design: The Hardware/Software Interface. Third Edition, Revised by David A. Patterson; John L. Hennessy (Paperback – Jun 1, 2007)

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