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and other DASDs announced with the IBM System/360 in 1964 used self-formatting variable length sectors, termed records or physical records by IBM. They detected errors in all fields of their records with a cyclic redundancy check (CRC) replacing parity per character detection of prior generations. These IBM physical records have three basic parts: a Count field, which acts as an ID field, an optional Key field to aid in searching for data, and a Data field;

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