is a disk storage technology that creates a single logical unit from multiple hard disk drives. Has become synonymous with a variety of disk storage schemes that separate and segregate data across multiple disk drives.
Redundant Array of Independent Disks (RAID)
Essentially, RAID divides and distributes stored data across multiple disk drives in one of several RAID levels, each of which provides different redundancy and performance. The system views the various RAID disk drives as one large storage device. The operating objective for RAID is data reliability, availability, and input/output (I/O) performance.