I did some timing tests on various class devices on my laptop as part of my backup system involves copying a 4 Gb file to one of a pair of SD Cards which are always in my shirt pocket. Oddly enough a class four SD Card, which allegedly would only transfer data a 4 Mpbs would transfer data at 8 Mpbs.
Personally I suspect the Touch hardware can't handle things all that fast. But I never attempted to figure out a good timing test for the Touch.
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