The Kingwin KF-4001-BK Hot Swap Rack is a multi-drive bay SATA internal hot swap enclosure that encloses 4 hard drives with only 3 bay slots. The Kingwin KF-4001-BK Hot Swap Rack also supports RAID, instant H.D.D. installation, and hot-swap ability. Get the Kingwin KF-4001-BK Hot Swap Rack today.