Hi, Abisha:
I don't currently use an SD memory card, but at one time I did use a 2-gig card without serious problems. The "problem" is that, as the card begins to fill up, it just takes too long for the Reader to perform certain operations, thus draining the battery.
One more thing: I get a LOT more than 100 books on my internal Reader, as one member here estimated. I have 340 titles on my Sony PRS-505, with only about 20 of those being short stories. The rest are novels of average length.
Don
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