Roomy Chassis: This 2U server case has 4 internal 3.5’ HDD bays plus 2 additional 2.5’ devices. Expandable & E-ATX Compatible: 7 PCI expansion slots and E-ATX (12 x 13in) compatibility gives you options for expansion. Quiet Cooling: 3 pre-installed 80mm cooling fans at center provide excellent airflow and heat protection at reduced noise. Desired Features: Front panel LED indicators for power, HDD, and LAN status monitoring allow quick, easy visual assessment. Additional utility with 1 USB 3.0 and 1 USB 2.0 port.