The Imation LTO4 tape cartridge or Imation LTO Ultrium4 data cartridge are the fourth generation of LTO Ultrium tapes, and were first released to the market in 2007. The Imation LTO4 tape has a capacity of 800GB with a speed of 120MB/s in native capacity and up to 1.6TB and a transfer rate of 240 MB/s in compressed capacity. The Imation LTO Ultrium 4 tapes have 896 tracks and a tape length of 820 meters. These Imation LTO4 tapes has a lifetime durability of 1,000,000 passes. A pass is each time the tape changes direction so a single backup could have over 1,000 passes depending on the data written.The Imation LTO 4 tapes are backward compatible and therefore able to be read or written to in all LTO4 or LTO Ultrium 4 drives, all LTO5 or LTO Ultrium 5 drives, and can be read only in all LTO6 or LTO Ultrium 6 drives.

Imation have discontinued the LTO 4 tape cartridge so these are the last available once sold.