Disk redundancy | Article about disk redundancy by The Free Dictionary
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disk redundancyWriting to two or more disks at the same time. Having the same data stored on separate disks enables the data to be recovered in the event of a disk failure without resorting to expensive data recovery techniques. RAID 1 and RAID 5 are common approaches to disk redundancy. See RAID, data redundancy and data recovery.
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With RAIDn the user just needs to decide how much capacity they want and how much security through disk redundancy