Dell LTO Ultrium-4 Data Cartridge (800GB/1600GB) The Dell LTO 4 Data Cartridge holds a native capacity of 800 GB and a compressed capacity of 1.6 TB (2:1 compression ratio). It's high-performance and capacity is engineered to back up data, restore, archive, and retrieve files. It provides fast transfer speeds and high levels of data security, which ultimately saves you time and money from operational costs. This cartridge has been tested extensively to ensure maximum performance.