Information technology. 3,81 mm wide magnetic tape cartridge for information interchange. Helical scan recording. DATA/DAT format|Recording equipment components, Storage, Signal level, Data processing, Optical properties of materials, Data recording, Packing density, Interchangeability, Data layout, Block formats, Information exchange, Coatings, Cassettes (magnetic tapes), Flaws, Resistance measurement, Transmittance, Working range, Electrical resistance, Dimensions, Defects, Data media, Testing conditions, Track pitch, Data transfer, Elongation, Magnetic properties of materials, Locking and locating devices, Tensile strength, Recording characteristics, Adhesion, Flatness (surface), Signal-to-noise ratio, Environment (working), Cases, Magnetic materials, Field strength (electric), Curvature, Magnetic tapes