D2-407BL-B5BL is iStarUSA 4U industrial rackmount chassis. It is combined with one BPU-340-SATA-Blue, which is iStarUSA 5x3.5" 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-B5BL provides your server or cluster maximum reliability and performance.