if you've purchased the content in the past, you will be able to re-download it on your gamertag whenever you need it, without paying again.
so if your USB becomes un-configured (happened to me) or your profile is damaged, you can go back to the marketplace and select it as if you were purchasing it again and it should say "Already Purchase" and you will be able to download it, free of charge
because you already paid.
hope this helps
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