Information technology. 3,81 mm wide magnetic tape cartridge for information interchange. Helical scan recording. DDS format|Data media, Testing conditions, Magnetic tape equipment, Recording characteristics, Interchangeability, Holes, Block formats, Lids, Recording equipment components, Optical measurement, Data layout, Recording tracks, Tensile strength, Transportation, Breaking load, Signal level, Electrical resistance, Peeling tests, Transmittance, Environment (working), Elongation, Electrical wave measurement, Yield strength, Dimensions, Conformity, Cassettes (magnetic tapes), Information exchange, Cupping tests, Magnetic tapes, Recording equipment, Test equipment