HP LTO 6 tapes C7976A 6.25 TB Pack of 10 tapes each tape holds 6.25 TB. LTO Ultrium cartridges meet all your demands for maximum reliability when restoring data, offering high storage density, ease of management, and scalable storage and backup performance. Covering six generations of capacity - and with transfer speeds of up to 1.4 TB/hr for LTO-6, there is a platform for every need and budget. You will need an LTO 6 drive to read your LTO 6 media. However, the drives are "backward compatible". When you upgrade to an LTO 6 drive, it will still be able to read and write your LTO 5 cartridges and read your LTO 4 tapes.