Best Device to Use with Blue and Me (1 Viewer)

Hi

I wonder does anyone know a decent USB device to use on Blue and Me in the car.

I have a memory stick with music on it but the system does not always see it unless i unplug and re plug it in

Thanks for any help

it is voice activated media system for a car I have Alfa Romeo

http://en.wikipedia.org/wiki/Blue%26Me