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RAID stands for Redundant Array of Inexpensive Disks. This technology has enabled to store the same data in different places i.e. in redundant manner on multiple hard disks and hence its name is RAID. With this technology data is placed on multiple disks so that the input/output operations can overlie in a balanced way. This has improved the performance as multiple disks increases the mean time between failures (MTBF). Moreover, storing the data redundantly also increases fault tolerance. A RAID appears as a single logical hard disk though multiple in numbers to the OS. This technology makes use of the disk striping technique. In this technique each drive’s storage space is partitioned into the chunks of memory ranging from 512 bytes to several MB and all the disk stripes are interleaved and addressed in order. The strip size depends on the type of OS i.e. multi-user or single–user OS. There are at least nine types of RAID plus a non-redundant array (RAID-0) each with its own functionality.

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