This dual drive SATA HDD Dock provides fast, convenient access to 2.5" or 3.5" SATA I or II hard drives through USB 3.0, without ever having to open a computer case or mount hard drives in an enclosure. Supporting one or two drives, CL-ENC50038 can be connected to the host computer through USB 3.0 then, it"s just a matter of inserting the desired 2.5" or 3.5" SATA drives (or combination of both) into one of the two (or both) docking station slots for instant access.