LTO4 Ultrium 1.6TB RW Data Tape Cartridge C7974A HP LTO Ultrium 4 data cartridges support all HP StorageWorks and non HP Ultrium tape devices. Assuming 2:1 compression, the latest fourth Generation products minimize interruption to network and SAN backup by being capable of protecting 864GB/hour of data and storing up to 1.6 TB on one piece of media.