Information technology. 3,81 mm wide magnetic tape cartridge for information interchange. Helical scan recording. DDS format using 60 m and 90 m length tapes|Test equipment, Magnetic tapes, Width, Magnetic tape equipment, Curvature, Performance testing, Specimen preparation, Recording equipment components, Design, Recording tracks, Cassettes (magnetic tapes), Lids, Electrical testing, Strength of materials, Length, Transmittance, Cupping tests, Optical measurement, Testing conditions, Information exchange, Containers, Thickness, Holes, Dimensions, Adhesion tests, Electrical resistance, Data media, Environment (working), Magnetic recording, Data recording, Elongation, Interchangeability, Data layout, Recording characteristics