What is parity?

Parity is a way of detecting transmission errors, performed as the data is being sent across the SCSI bus.

There are two types of parity: odd and even parity checking. SCSI uses odd parity checking such that the number of logical 1's in a given bit should always result in an odd number. If it doesn't, the device knows that an error has occurred and requests that the data be re-sent.

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