Its in the navigation manual. The answer is you go to your USB source, then you push to the right until you get the options menu (or hit option button) and I can't remember either do it from that menu or in the manage music menu on there.
Read the manual, as there are some caveats, like you don't want to do a backup/restore unless its your whole collection, as a restore will delete your entire collection and replace it. You can move from USB to HD without hurting your collection, though.
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