Hi,
One way to test this is with a bandwidth test. Download Sisoft Sandra, its a free PC benchmarking program. Then if you have a USB key plug it in and benchmark read write speeds with the USB 1.1 device also plugged in. USB 1.1 is 12 megabits per sec max, so if you get around this or higher then definately you are running at USB 2.0 speeds.
Paul
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