How RAID Works
With RAID technology, data can be mirrored on one or more other disks in the same array, so that if one disk fails, the data is preserved. Thanks to a technique known as "striping," RAID also offers the option of reading or writing to more than one disk at the same time in order to improve performance. In this arrangement, sequential data is broken into segments which are sent to the various disks in the array, speeding up throughput. Also, because a RAID array uses multiple disks that appear to be a single device, it can often provide more storage capacity than a single disk.