Type Storage media - MammothSpecifications. Tape Cartridge - Mammoth-2. Native Capacity - 20 GB. Compressed Capacity - 50 GB. Tape Length - 75 mFeatures. Type Storage media - Mammoth. Tape Cartridge - Mammoth-2. Native Capacity - 20 GB. Compressed Capacity - 50 GB. Tape Length - 75 m