Norco 2U Rack Mount Twelve Hot-Swappable SATA II, III/SAS 6G Drive Bays Server Chassis RPC-2212 2U rack mount design Twelve hot-swappable SATA II, III/SAS 6G drive bays Three internal SFF-8087 Mini SAS connectors support up to twelve 3.5" or 2.5" SATA II, III or SAS 6G hard disk drives Backplanes are horizontal mounted for better ventilation LED indicators for power and activity on each HDD tray 12 x 3.5" hot-swappable drive bays Redundant 4pin Molex PSU connectors Smooth border prevent lacerating your skin