HD Tune shows a flat ~35MB/s transfer speed, which is very typical for a USB-connected hard drive. That equates to 280Mb/s and the theoretical bandwidth limit of USB 2.0 is 480Mb/s, so we're getting a little more than half of that throughput.
HD Tach displays similar results, with an average read ~36MB/s or around 290Mb/s. It bursts only up to 37.5MB/s so this is probably about the limit of what USB 2.0 can do.
Let's wrap things up with some final thoughts and conclusion.