What Is a Redundant Array of Inexpensive Disks?

Redundant Arrays of Inexpensive Disks (RAID) RAID is a drive array used as a single drive. The data is evenly written on each drive by a "striping" technique. The striping technique places the data on two or more drives separately, as shown roughly in Figure R-1. Data splitting can be performed at the bit level or sector level. A sector is a disk data block. Splitting improves throughput and provides a form of redundancy that can ensure that a disk failure in the disk array does not affect the normal operation of the system. This is done by encoding the scattered data into a backup drive called a parity drive. Realized.