Logisys CS4801H Industrial 4U Server Chassis Cases 1.2mm Steel Motherboard Compatibility: up to 12" x 9.6" ATX Form Factor: 4U (2) 5.25" External Drive bays (1) 3.5" Drive Bay (6) 3.5" Internal Drive bays Expansion Slots: 7 Front Ports: 2 Front Access USB