Contains a computer memory chip (just like the data tape), which stores various information and has an embedded code that is recognized by the compatible drive's firmware. For use on all LTO Ultrium 7, LTO Ultrium 6, LTO Ultrium 5, LTO Ultrium 4, LTO Ultrium 3, LTO Ultrium 2 and most LTO Ultrium 1 drives. 15 - 50 uses, drive dependent. Sold by each.