These Imation 42337 tapes are DLT-IV tape cartridges. Each of these Imation 42337 tape cartridges has a native capacity of 40 GB and 80 GB compressed. The 42337 has a tape of length 1828 feet and has an MP (Metal Particle) tape formulation. The compatibility of these 42337 DLT-IV tapes is limited to DLT4000, DLT7000, DLT8000 and DLT1/VS80 tape drives and auto-libraries only. The Imation 42337 Black Watch tape cartridge is capable of lasting for 1,000,000 passes or for up to 30 years in archival life.