RAID (redundant array of independent disks)
A set of techniques for managing multiple disks for cost, data availability, and performance. See also mirroring, striping.
A disk array set up with part of the combined storage capacity used for storing duplicate information about the data stored in that array. This makes it possible to regenerate the data if a disk failure occurs.
A collection of specifications that describe a system for ensuring the reliability and stability of data stored on large disk subsystems.