Koutech Dual Hot-Swap 2.5" SATA Drive Mobile Rack 3.5" bay designed front panel module and fits in any 3.5" front drive bay Supports up to two (2) 2.5" SATA-I/SATA-II/SATA-III hard disk drives Can be used as external storage device Built-in Power & HDD activity LED indicator lights Supports Windows 98SE/ME/2000/XP/Server 2003/Vista/Server 2008/Windows 7/Windows 8 or later, Linux OS, Mac OS X or later