I had the same question just a while back. The answer to it was that the USB on the Rio Car was long before the USB 2.0 spec was designed and also that even if it could be updated to 2.0 then the bus on the Rio Car would still limit the transfer rate. Doesn't sound like it would work.
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Rio Car 30gb
2000 Boxster S, <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />