I'm guessing that the speed is of a flash drive? So long as you have usb 2.0, a flash drive's speed should depend mostly on the drive itself. For example, I just took some flash drives I had laying around and tested them. Copying a 128 MB zipped file, and timed with my watch over three runs (I only guarantee my numbers to +- 20%) here are the results.
For a cheap axiom I was given by my college: 53 seconds, or 2.4 MB/S
For a cheap crucial I bought: 38 seconds, or 3.4 MB/S
For a nice Patriot Xporter of my brother's: 9 seconds, or 14 MB/S
And all on the same netbook, running linux mint 8. So you see that it all depends on the drive you have.