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There are other RAID levels available which are a combination of levels 1 to 5.
RAID 10 - Striped RAID 1 arrays
RAID 10 is implemented as a striped array whose segments are RAID 1 arrays. It has the same fault tolerance as RAID level 1 with the same overhead for fault tolerance as mirroring alone. RAID Level 10 requires a minimum of 4 drives. This RAID level is a combination of RAID 1 (mirroring) and RAID 0 (striping), having both features of these arrays - security and sequential performance. Typically four plus hard drives are used, because RAID 10 creates two pairs of mirrored arrays and combines these arrays to form one RAID 0 array. RAID 10 is especially appropriate for large file transfers, and because parity there is no parity overhead, write operations are very fast.
RAID 50 - striped RAID 5 arrays
RAID 50 is a dual level array that combines multiple RAID 5 implementations into a single array. In RAID 50, a single hard drive failure can occur in each of the RAID 5 implementations without loosing any data on the entire array.
RAID 51 - Mirrored RAID 5
Two RAID 5 systems mirrored. Requires six or more disks.
RAID 53 - Striped RAID 3 systems
RAID 53 is implemented as a striped (RAID level 0) array whose segments are RAID 3 arrays. RAID 53 has the same fault tolerance as RAID 3 as well as the same fault tolerance overhead. RAID Level 53 requires a minimum of 5 drives.
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