parity
A method that provides complete data redundancy while requiring that only a fraction of the storage capacity of mirroring.
The data and parity blocks are divided between the drives so that if any single drive is removed (or fails), the data on the
drive can be reconstructed. Data is reconstructed by using the data on the remaining drives. The parity data might exist on
only one drive, or the parity data might be distributed between all of the drives in the Redundant Array of Independent Disks
(RAID) group.