The 3U Rack-Mount Kit holds up to two full-height internal tape drives, four half-height internal tape drives, or a combination of one full-height and two half-height tape drives. This enclosure supports a wide range of tape technologies, including DAT, DLT VS, SDLT, and Ultrium, with a maximum capacity of 6 TB using two LTO-5 Ultrium 3280 or 12 TB with four LTO-5 Ultrium 3000 SAS drives (assuming 2:1 data compression).