Optimized for enterprise-level high-capacity storage applications, Supermicro's SC846 Chassis features 24 hot-swap 3.5" SAS/SATA hard drive trays and 2 fixed internal hard drive bays in a 4U space. The SC846 design offers maximum HDD per space ratio in a 4U form factor, high power efficiency (Gold Level & 85%+), optimized HDD signal trace routing and improved HDD tray design to dampen HDD vibrations and maximize performance. Equipped with 900W or 1200W (Gold Level) high-efficiency redundant power supplies and 5 hot-plug redundant cooling fans the SC846 is a reliable and hassle-free maintenance storage system.