Optimized for enterprise-level high-capacity storage applications, Supermicro's SC847 Chassis features 36x (24 front + 12 rear) 3.5" Hot-swap HDD bays as server chassis or 45x (24 front + 21 rear) 3.5" Hot-swap HDD bays as JBOD chassis in a 4U space. The SC847 design offers extra high-density of HDD per space ratio in a 4U form factor, high power efficiency, optimized HDD signal trace routing and improved HDD tray design to dampen HDD vibrations and maximize performance. Equipped with 1400W (Gold Level) high-efficiency redundant power supplies and 7 hot-plug redundant cooling fans. SC847 is a reliable and hassle-free maintenance storage system.