This is a 2.5 TB/6.25 TB LTO-6 Ultrium non-erasable, non-rewritable WORM data cartridge. This sixth generation LTO Ultrium tape media offers 2.5 TB native capacity and up to 6.25 TB compressed capacity for even greater efficiency and performance. This exceptional capacity helps reduce the number of cartridges and the amount of equipment, space and labour associated with tape-based data storage.