I don't use the memory card. Recently, I started keeping about 60 to 100, but usually closer to 60, books on my Reader. (I use to have about 300, then realized that it was way more than I needed or would read right away.)
At least, twice a month I plug in and reload books and this is enough time to recharge the Reader.
I set up my collections in genre, so whatever mood I am in, I can find something to read.
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