description of the raid

in this article I will explain about the notion raid

"Various kinds of methods are used to enhance performance and also reliability of the disk. Usually to improve performance, involved a lot of disks as one storage unit. Of each block of data is broken down into sub-blocks bebarapa, and is divided into the disks (striping) . when sending data disks work in parallel, thus increasing the transfer speed in reading or writing data. coupled with the synchronization of the rotation of each disk, then the performance of the disk can be improved. this way is known as RAID - Array of Independent Redudant (or Inexpensive) Disks. other than RAID performance problems can also increase the reliability of the disk by using an additional disk (redudant) to store the parity bits / block or as a disk-disk mirror from existing data.
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