Unique Top mounted 200mm TriCool exhaust fan to cool the hottest system. Perforated front bezel for maximum air intake. Two front loaded HDD cages for up to 6 hard disk drives. The HDD cages act as air ducts to take air in more efficiently. Top mounted I/O ports for easy access. Top tray for your MP3 player, digital camera, etc. 9 Drive Bays. - External 3 x 5.25; Internal 6 x 3.5 for HDD, or. - External 6 x 5.25; Internal 3x 3.5 for HDD, or. - External 9 x 5.25.