iStarUSA 4U industrial rackmount chassis D Storm D-400-B8SA. Combine with BPU or T Series enable hot-swappable storage capability. It also supports up to seven add-on cards and total storage capacity up to 8 hotswap storage drives for RAID configuration. D-400-B8SA provide your server or cluster maximum reliability and performance. Optional Aluminum Body reduces total chassis weight and also provides enhanced thermal cooling solution.