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parity bit
(redirected from Parity block)

   Also found in: Wikipedia 0.06 sec.

An extra bit attached to the byte, character or word used to detect errors in transmission.


(storage, communications)parity bit - An extra bit added to a byte or word to reveal errors.

See parity.


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? Mentioned in ? References in periodicals archive
 
In RAID 5, data is cut into fixed-size strips and separately stored in the hard disks in turn; meanwhile, a parity block will be created in each horizontal stripe or block and is designed to protect other data blocks in horizontal blocks, but can only handle single data block damage.
Each parity block contains information that can be used to recreate the information in the other blocks of data within a single stripe.
Similar to initialization, the process of rebuilding requires that each data block on the system is read and the XOR computations are performed in order to obtain the absent data and parity blocks, which are then written onto the new disk.
 
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