Sans Digital HDDRACK5 5-Bay IDE/SATA Hard Drive Organizing Rack Houses up to five hard drives by using easy to install turnbuckle screws. Designed with a 4.7 cooling fan and a hollow aluminum frame forefficient heat dissipation. Designedwith an ON/OFF power switch, which controls the power of hard drives, when a 20-pin or 24-pin ATX power supply is connected. Expandable to 10-bay by stacking an additional unit on top and securing it with a tool-less screw.