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To me, an SD (or equivalent) is vital. If your running non-DRM'ed books, and your machine fails (battery or whatever), you just pop out the SD, and put it into another machine. (and it doesn't even have to be the same brand). You can even back it up on your computer. If all your books are on the internal memory, and the machine breaks, you may have to reload the repaired machine all over again....
(I said may not necessarilty have to).
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