The WiebeTech Cru RTX410-3QJ DAS Hard Drive Array tower offers high performance, multiple interface options and supports four 3.5" SATA hard drives. TrayFree bays make adding or changing drives effortless. It's as easy as opening the door, sliding the drive in and closing the door. No screws, no trays, it just works. RTX410-3QJ includes a quadruple host interface with eSATA, USB 3.0 (backward compatible to USB 2.0) and dual FireWire 800 (backward compatible to FW400) ports.