Optimized for enterprise-level high-capacity storage applications, Supermicro’s SC847D Chassis features 90x 3.5″ SAS3/SAS2/SATA3 HDDs in 45x (24 front + 21 rear) Hot-swap Drive Bays as server chassis in a 4U space. Or 90x 3.5″ SAS3/SAS2/SATA3 HDDs in 45x (24 front + 21 rear) Hot-swap Drive Bays as JBOD chassis in a 4U space. The SC847D 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 redundant high-efficiency 1280W (2+1) (Platinum Level, 95% efficiency) or 2000W (1+1) power supplies with PMBus functionality and I2C for enhanced power management, and 7 hot-plug redundant cooling fans, the SC847D is a reliable and hassle-free maintenance storage system.