Standard pc components standard micro atx motherboard 3 5 2 5 hard drives standard atx ps2 power supply units it would be easy to upgrade and server in the future thermal solution there is a 140mm intake fan input high air flow volume with lower rpm to push the cold air through the hdd cage 120mm exhaust fan at the top of the chassis hdd rack sata hot swap hdd cage using thumb screws with rubber suspension supports five 3 5 hdds hdd tray supports two of 3 5 or three of 2 5