LTO Ultrium 6 tape drives support the LTO Generation 6 media specification of more than double the compressed capacity of up to 6.25 TB with 2.5 to 1 compression (up to 2.5 TB native capacity) compared to previous LTO 5 compressed capacity of up to 3.0 TB with 2:1 compression (up to 1.5 TB native capacity) per tape cartridge. IBM Ultrium 6 tape drives can read and write LTO Ultrium 5 and 6 data cartridges, and can read LTO Ultrium 4 data cartridges.