iStarUSA Group 3U compact rack mount/supports front access USB2 0 x2/support ATX PS2 power supply/compact size less than 16" In depth. The 3U industrial rackmount chassis D Storm D-300. Optional BPU series enable hot-swappable storage and RAID configuration. 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.