Information technology. 8 mm wide magnetic tape cartridge for information interchange. Helical scan recording|Recording tracks, Locking and locating devices, Cupping tests, Test equipment, Performance testing, Electrical resistance, Transmittance, Cassettes (magnetic tapes), Adhesion tests, Environment (working), Data blocks, Recording equipment components, Optical measurement, Circuits, Performance, Data processing, Dimensions, Recording media, Magnetic tape equipment, Data layout, Magnetic tapes, Data transfer, Data media, Marks, Interchangeability, Transportation, Magnetic recording, Electrical wave measurement, Form tolerances, Strength of materials, Clearances, Holes, Elongation, Recording characteristics, Electrical testing, Magnetic tape recordings, Data recording, Testing conditions