RAID (Redundant Array of Independent [or Inexpensive] Drives)
If used correctly, disk (tape, CD-ROM, etc.) drive arrays may provide several advantages over the single drive: higher reliability and higher data transfer rate.
A simple replacement of one drive by a group of drives will not increase reliability since the life of the entire system will depend upon any one of these drives. In fact, reliability (mean time before failure or MTBF) will decrease with the increasing number of drives since the probability for one of them to fail is increased. This is why a certain level of redundancy is needed in the design of a drive array to increase the reliability of the entire storage system.
RAID is an assembly of disk drives, known as disk array, ...
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