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I only have a few books in fb2 format. However I just checked them and noted they are almost double the size of the same book in epub or lit format. Even so, you should be okay with the 4 gig card. Your 1700 books should be about 2.6 gig if they are fb2 format. That gives you an additional gig of storage, or another 650 books or so. That's still a lot of books to add!
-Marcy
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