1. Dedicated parity
  2. Double parity
  3. Hamming code parity
  4. Distributed parity
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Option 4 : Distributed parity

RAID 5 consists of block-level striping with distributed parity. Unlike in RAID 4, parity information is distributed among the drives. It requires that all drives but one be present to operate. Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost. RAID 5 requires at least three disks.

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