RAID
RAID is an acronym for Redundant Array of Inexpensive Disks. RAID provides a means to improve the reliability of disk storage while still utilizing low cost disk drives. This is accomplished by arranging the disk drives into arrays and creating redundancy of the information stored on the drives. Storage systems using RAID are referred to as being a RAID array. RAID arrays distribute data onto multiple disks. Computers which access the array see the data there as if it were on only one disk.
