Fractal Design Computer Case FD-CA-DEF-R5-BKO-W Motherboard Compatibility: Micro ATX / ATX / Mini-ITX 2 x USB 3.0 / 2 x USB 2.0 / Audio Front Ports 2 External 5.25" Drive Bays 8 - 3.5" HDD positions (can also accommodate 2.5" units) Internal 3.5" Drive Bays