Hmm. I've been able to remove the card and still come back to the place I was in all of the books I have opened.
I dod find that I had to get at least up to the "books" menu when I remove the card or I'll end up with file corruption on the book I'm actually in.
I also always switch the card with the the unit *on*. It comes out while the unit is on, and it gets inserted while the unit is on. That way the reader gets a chance to recognize the switch and handle it -- if I have added new books it can take a while to scan, but that's ok.
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