The CRU RTX220-3SJ JBOD tower offers high performance, multiple interface options and supports two 3.5" SATA hard drives. TrayFree bays make adding 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. The RTX220-3SJ includes multiple host interfaces with eSATA and USB 3.0 ports which makes connecting to most hosts quick and easy.