iStarUSA 4U industrial rackmount chassis D Storm D-400-50R8PD2. 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 RAID configuration. With a 500W redundant power supply, D-400-50R8PD2 provide your server or cluster maximum reliability and performance with zero down time.