The basic idea of RAID (Redundant Array of Independent Disks) is to
combine multiple inexpensive disk drives into an array of disk drives to
obtain performance, capacity and reliability that exceeds that of a single
large drive. The array of drives appears to the host computer as a single
logical drive. This Adaptec technical paper describes the five types of array architectures, RAID 1 through RAID 5.

For more information on RAID, visit Adaptec’s Web