The DRW115CADBK is an extra IDE hard drive caddy or carrier for using multiple removable drives on the same system. You can swap operating systems, make high speed, high capacity backups or provide individual hard drives for multiple users. It features a protective shock absorption system, an all aluminum extra rugged construction for extra security & cooling, two front-mounting ball bearing fans to keep your drives at their optimum temperatures & four LED indicators keep you updated on your drive's status, & is Plug & Play compatible with the DRW115ATABK.