Case Form Factor: 2U Rackmount, Motherboard Compatibility: mini ITX; micro ATX; Standard ATX; Extended ATX, Drive Bays: 2 IOS x 2.5" Internal; 12x 3.5" HotSwap or 2.5"; 12x 3.5" HotSwap or 2.5", Hot-Swap Backplane: 12x SATA/SAS 12Gbps Hot-Swap Bays; 3x MiniSAS SFF-8643 Connectors, 3x Molex Power Connectors, Expansion Slots: Low Profile x7, Cooling: 4x 80mm High Speed PWM Hot Swap Fans, Power Supply Form Factor: 2U Single, Front Panel: 1x USB 2.0, Switches: Power and Reset, Indicators: Power, LAN, and HDD LEDs, Colour: Silver.