DESC: Supermicro's SuperChassis SC846TQ-R900B Chassis features 24 hot plug SAS/SATA hard drive trays and 2 fixed internal hard drive bays in a 4U space. With availability and stability as top priority, the SC846TQ-R900B design offers maximum HDD per space ratio in a 4U form factor, high power efficiency (85%+), optimized HDD signal trace routing and improved HDD tray design to dampen HDD vibrations and maximize performance.