What Pentium Said is true. IDE's max rate is 133 Mb/s, and since USB 3 has a Max of 5 Gb/s, the extra data bandwidth wont be used so you wont see any boost in performance from a USB 3 Enclosure. I think the goes for USB 2.0. USB 2.0 has a max of 480 Mb/s, so you wont see any additional performance with 2.0 either.