parity checking definition of parity checking in the Free Online Encyclopedia.

parity checking

An error detection technique that tests the integrity of digital data in memory or on disk. Parity checking adds an extra parity cell to each byte of memory and an extra parity bit to each byte transmitted. The value of the ninth bit (0 or 1) depends on the pattern of the byte's eight bits. Each time a byte is transferred or transmitted, the parity bit is tested by circuits on the motherboard.

Only One Bit Errors
"Even parity" systems make the parity bit 1 when an even number of 1 bits are in the byte; "odd parity" makes it 1 for an odd number of 1s. However, parity checking cannot detect two bits in error in the same byte, because the parity would still be correct for that binary sequence. Error-correcting code (ECC) is a more robust memory checking system (see ECC memory).

Lots of No Parity in the World
There are 12% more memory cells in 9-bit parity chips than there are in 8-bit non-parity memory. To shave costs, many computers are built with non-parity memory, and it is truly a miracle that the memories in the billions of non-parity computers in the world work as well as they do. See RAID and ECC memory.

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No references found	Further, the S2A provides enterprise-class data protection and reliability with multiple levels of redundancy, incorporating on-the-fly parity checking of all read I/Os and Hardware RAID 6 with no loss of performance across a broad range of computational, visualization, and nearline environments. DATADIRECT NETWORKS LEADS AS TOP SUPERCOMPUTER STORAGE by Mainframe Computing The new server models also offer additional parity checking functionality that ensures that processing errors are automatically self-corrected, including cache errors. FUJITSU DEBUTS ENTRY-LEVEL "PRIMEPOWER" SERVERS by UNIX Update The system enables the creation of differentiated high performance, high capacity NAS and SAN storage, parallel and shared file system storage, primary and nearline storage and virtual tape library storage solutions and incorporates enterprise-class data protection such as on-the-fly parity checking of all read I/Os and hardware RAID 6. DataDirect Networks' S2A9550 Storage System Helps Indiana University ... by Business Wire	Paris, Treaty of Paris, Treaty of 1259 Paris, Treaty of 1763 Paris, Treaty of 1814 Paris, Treaty of 1815 Paris, Treaty of 1856 Paris, Treaty of 1898 Paris, Treaty of 1952 Paris, University Paris, University of Paris-Match Parish parish clerk parish council parish house parish register Parish, Mrs. Henry, II Parisian Union Bank Parisii Parisite parison parison swell Parity parity bit parity check parity checking parity conservation parity drive parity error parity memory Parity of a State parity selection rules parity transformation Parizhskaia Kommuna Moscow Footwear Factory Park Park Chung Hee Park City Park County Park of Culture and Recreation Park Range Park Ridge Park, Maud Wood Park, Mungo Park, Robert E Park, Robert E. Park, Rosemary Park, Roswell Park-Miller Parka parkade Parke County	parities paritonsillar abscess Paritor Paritory parity parity parity parity parity parity Parity (mathematics) Parity (medicine) Parity (medicine) Parity (medicine) Parity (physics) Parity (physics) Parity (telecommunication) Parity (telecommunication) parity bit parity bit parity bit parity bits parity bits Parity block Parity block Parity Bond Parity Bonds parity check parity check Parity Check Code parity checking parity conjugation Parity conservation parity drive parity error parity error Parity Error Rate Parity Error Seconds Parity Even/Enable Parity flag Parity game Parity High Parity Low parity memory Parity Modulation Encoder Parity Odd Parity of a State Parity of Product Parity Pulsed Row under IL Parity RAM parity selection rules Parity transformation Parity value Parity Violating Electron Scattering Parity, Purchasing Power Parity-Concatenated Trellis Code

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Further, the S2A provides enterprise-class data protection and reliability with multiple levels of redundancy, incorporating on-the-fly parity checking of all read I/Os and Hardware RAID 6 with no loss of performance across a broad range of computational, visualization, and nearline environments.

DATADIRECT NETWORKS LEADS AS TOP SUPERCOMPUTER STORAGE by Mainframe Computing

The new server models also offer additional parity checking functionality that ensures that processing errors are automatically self-corrected, including cache errors.

FUJITSU DEBUTS ENTRY-LEVEL "PRIMEPOWER" SERVERS by UNIX Update

The system enables the creation of differentiated high performance, high capacity NAS and SAN storage, parallel and shared file system storage, primary and nearline storage and virtual tape library storage solutions and incorporates enterprise-class data protection such as on-the-fly parity checking of all read I/Os and hardware RAID 6.

DataDirect Networks' S2A9550 Storage System Helps Indiana University ... by Business Wire