RAID (Redundant Array of Independent Disks)
RAID is a technology that is used to increase the performance and/or reliability of data storage.
The abbreviation stands for Redundant Array of Inexpensive Disks. A RAID system consists of two or more drives working in parallel. These disks can be hard discs, but there is a trend to also use the technology for SSD (solid state drives). There are different RAID levels, each optimized for a specific situation.
RAID | Disks Required | Failure Conditon
RAID 0 | 2 or more | A single drive failure breaks the array with data loss
RAID 1 | 2 or more | Array will work as long as one drive is opera>onal
RAID 5 | 3 or more | Need all drives opera>onal but one
RAID10 | 4 or more | Can lose all but one from each set of mirrors