The D-300-PFS 3U server case from iStarUSA proves that rack mount server cases don't have to be boring looking to function well. The 3U form factor lets the case accept 12"x10" ATX motherboards. That means there is room inside for 7 full height expansion cards, so you have a wider variety of options. They didn't skimp on drive space either with two 5.25" and one 3.5" external bays and five 3.5" internal bays. This gives you plenty of room to build an internal RAID solution. Up front with the drive bays is a spot for a regular ATX power supply so you don’t have to worry about sourcing a special unit. The front panel has LED indicators for an indication of system status at a glance. There are also 2 USB ports for quick connections of external devices. In between the LEDs and the USB ports is a keyed lock to prevent unauthorized users from opening the drive bay doors. The doors hold washable air filters. Motherboard Compatibility: 12 x 10 (ATX, micro-ATX) External 5.25" Drive Bays: 2 External 3.5" Drive Bays: 1 Internal 3.5" Drive Bays: 5 Expansion Slots: 7 Front Ports: 2 x Front USB 2.0 Connector 60mm Fans: 1 80mm Fans: 1