Personally I think that the number of books that you can put in your reader is bounded by the amount of memory that reader and the SD card. I did a search on Yahoo and there are no answers to that question but the concensus is there are approximatly 4 million photos per 8gb sd card. So sicne a book tends to be bigger then a photo I would suppose approximatly 2 million books on your SD card depending on size of the book. As long as you don't go putting Terry Goodkind's Sword of Truth series on the SD card, those are extordinarily large or some of the Harry Potter series are rather long you should be able to get away with approximatly 2 million books. Then when you reach that limit you could always swap out for a new SD card and keep going.
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