The TDK LTO1 data cartridge or TDK LTO Ultrium 1 data cartridge has a capacity of 100GB native and up to 200GB compressed capacity. The TDK LTO1 tape can be read and written to in an LTO Ultrium 1 drive, can be read and written to in an LTO Ultrium 2 drive, or can be read in an LTO Ultrium 3 drive. The TDK LTO 1 tape can be used in any brand of LTO1, LTO2 or LTO3 drive carrying the LTO Ultrium logo. 

TDK have discontinued the LTO 1 tape cartridge and so this is the last of stock until sold.