RAID is an acronym for Redundant Array of Independent Disks. It describes a storage solution in which part of the storage capacity is used to store redundant information about user data stored on the remainder of the storage capacity. The redundant information enables regeneration of user data if one of the disk drives in the array fails.
RAID relies on a series of RAID levels to determine how drives connect and how the controller reads and writes data and redundancy on the drives. You can create RAID levels 0
Important: RAID level 1 requires an even number of drives, and RAID level 3 and level 5 require at least three drives.