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It is a simple way of detecting errors in SCSI data that is required to be built into all SCSI-2 devices. It counts the number of 1’s in a byte of data and sets a parity bit so that the number is always odd or even. SCSI uses odd parity. You can use parity checking only if all devices on the bus use parity checking. Parity checking has been replaced by CRC in Ultra 4 SCSI.
