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I use the sd card for sideloaded books. We have three readers on the go here, each with different epubs on them. When I got my Aura, I just pulled the sd card out of the glo I had been using, inserted it in the aura, and I was good to go. I read both kepubs and epubs--probably about 50/50. If I buy from Kobo, I always read the kepub.
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