D2-407BL-B6 is iStarUSA 4U industrial rackmount chassis. It is combined with one BPU-340-SATA, which is iStarUSA 6x3.5" Hot-Swap Cage, to enable hot-swappable storage capability. It also supports up to seven add-on cards for system expansions and upgrades. D2-407BL-B6 provides your server or cluster maximum reliability and performance.