The Imation LTO1 or Imation LTO Ultrium 1 data cartridge has a capacity of 100GB native and up to 200GB compressed capacity. The Imation LTO1 tape cartridge 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 only in an LTO Ultrium 3 drive. The Imation LTO 1 tape can be used in any brand of LTO drive if it has the LTO Ultrium logo. 

Imation have discontinued the LTO 1 tape cartridge so this is the last available once sold.