- Patented Aluminum Front Panel with Locks,Taiwan: 200281 / 190240 , China: 2L01259648.5. - Front Access USB2.0 x2. - 60mm x1 Cooling Fan. - Removable Air Filter. - Power and HDD LED. - Power and Alarm Reset Switch. - Optional Aluminum Chassis. - Optional Hot-Swappable HDD Cage. The 3U industrial rackmount chassis D Storm D-300. Optional BPU Series enable hot-swappable storage, 1/0/0+1/JBOD raid configuration, and up to total of 6 HDD storage capacities. D-300 backplane supports 7 full-length add-on cards. Optional Aluminum Body reduces total chassis weight and also provides enhanced thermal cooling solution provide your system with maximum flexibility and performance.