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standard by International Organization for Standardization, 12/01/1978
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Includes file structures for data interchange on magnetic tape cassettes. Specifies three systems: 1) basic system; 2) compact system; 3) extended system. Not limited to 3.81 mm magnetic tape cassettes but is also applicable to higher capacity cassettes or cartridges. References: ISO 646; 1001; 3275; 3407.