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`RAID1 (Redundancy)` - Mirrors all data from one partition onto one or more other disks. Additional devices in the array provide increasing levels of redundancy. RAID 1 requires at least two disks.
`RAID4 (Error Checking)` - Distributes data across multiple disks and uses one disk in the array to store parity information which safeguards the array in case any disk within the array fails. Because all parity information is stored on one disk, access to this disk creates a "bottleneck" in the array's performance. Level 4 RAID requires at least three disks.
`RAID5 (Distributed Error Checking)` - Distributes data and parity information across multiple disks. Level 5 RAIDs therefore offer the performance advantages of distributing data across multiple disks, but do not share the performance bottleneck of level 4 RAIDs because the parity information is also distributed through the array. RAID 5 requires at least three disks.
`RAID6 (Redundant Error Checking)` - Level 6 RAIDs are similar to level 5 RAIDs, but instead of storing only one set of parity data, they store two sets. RAID 6 requires at least four disks.
`RAID10 (Performance, Redundancy)` - Level 10 RAIDs are nested RAIDs or hybrid RAIDs. They are constructed by distributing data over mirrored sets of disks. For example, a level 10 RAID array constructed from four RAID partitions consists of two mirrored pairs of striped partitions. RAID 10 requires at least four disks.