iStarUSA 4U industrial rackmount chassis D Storm D-400. 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 5 storage drives for 1/0/5 raid configuration. D-400 provide your server or cluster maximum reliability and performance. Optional Aluminum Body reduces total chassis weight and also provides enhanced thermal cooling solution.