Redundant Array of Inexpensive Disks (RAID) is a method to configure several disks as one unit to make them more resilient by creating some physical data redundancy.
The popular RAID configurations (some people say RAID level) are
RAID 0,
RAID 0 (also known as a stripe set or striped volume) splits data evenly across two or more disks (striped) with no parity information for redundancy
RAID 1,
RAID 1 creates an exact copy (or mirror) of a set of data on two or more disks
RAID 5,
A RAID 5 uses block-level striping with parity data distributed across all member disks. RAID 5 has achieved popularity because of its low cost of redundancy
and RAID 1+0 (some people say RAID 10).
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