Backwards compatible with USB 2.0; External (Plug Powered) Hard Drive.
Here's a review from an Amazon customer:
4.0 out of 5 stars Useful capacity now matched with a useful speed, 9 Dec 2010
By Dr. D. M. Hunt - See all my reviews
This review is from: Verbatim 47659 USB 3.0 External 3.5 Inch 2TB HDD (Personal Computers)
I have a multitude of external USB2 and a few eSATA drives, on the lookout for a couple more drives, I thought I'd give this new fangled USB3 a go.
The drive is fast, I compared it to a USB2 drive, the data rate starts at around 130Mbyte/s and declines to around 80Mbyte/s at the end of the disc.
A Western Digital MyBook on USB2 started at 22Mbyte/s and ended at 22Mbyte/s.
This drive takes about five hours to format, vs. nearly two days for a USB2 drive of the same capacity.
Another interesting point, the CPU utilisation for the USB2 was around 10% and it was 0% for the USB3.
My only gripe with this product is that the cable is very short, a one metre cable should be standard, but it comes with what looks to be a 50cm cable, so it gets four stars.