IBM TS4300 Tape Library machine type 3555 model L3A can be used as rack mountable unit,and can accommodate up to three Ultrium half-high tape drives with either SAS or Fibre type of attachment, one Ultrium full-high with Fibre type of attachment, or a combination of one Ultrium full-high plus one Ultrium half high tape drives. It can also hold up to 40 data cartridge slots in two removable magazines, including a standard five-cartridge I/O station. Other standard features include a 240 x 128 pixel monochrome graphic display with a front USB port, a 10/100/1000 Ethernet Port, and a high-speed barcode reader.
Note: Details about capacity are available at the TS4300 page in IBM Documentation.