Spacious Chassis: This huge 4U server case comes with 7 internal 3.5' HDD bays. It only supports HDD drives with three screw holes on each side, allowing for a secure, 3-point connection on each side. IT DOES NOT Support HDD drives with two screw holes on each side. Expandable & Compatible: 7 PCI slots, supports ATX/CEB motherboards for future upgrades. Quiet Cooling: 3 pre-installed PWM fans (1x120mm front, 2x80mm rear) for efficient, quiet cooling. LED Indicators: Front panel LEDs for power and HDD status for quick monitoring. Enhanced Utility: 2 USB 3.0 ports and a front panel lock for added security.