The 3.5" USB 3.0 External Enclosure, model TU3-S35, supports one 3.5" SATA I or II hard disk drive with storage capacities in excess of 1 Terabyte. Store and transfer content at 5Gbps USB 3.0 speeds - 10 times faster than USB 2.0. Install a SATA I or II hard drive and connect the enclosure to a 5Gbps USB 3.0 port on your computer. USB 3.0 is backward compatible with USB 2.0 ports. Large cooling vents and an aluminum housing cool the enclosed hard drive. Save time by transferring large files at breakthrough 5Gbps USB 3.0 speeds.