 LTO (Linear Tape Open, also known as Ultrium) single reel cartridge was announced in 1997 at 100 megabytes and in its eighth generation supports 12 terabytes in the same sized cartridge.LTO has completely displaced all other tape technologies in computer applications, with the exception of some IBM 3592 family at the high-end.Recording density for computer tapes is described with the acronym BPI, sometimes written bpi.