I've played with it on and off, filling it up and then testing it out. The comfortable limit seems to be 2000 books. (Mine don't tend to have illustrations, around 200 pages or so.)
More than that, and it becomes really slow, and then will lock up. It's fine with just a book open while I'm reading, but once I go outside and try to do anything it got slower it got until it just locks up.
I don't think it's the space, but the OS being able to process the number of books.
All the eInk machines I've had had a limit to what it can really process, no matter how much space was left in the machine or the card.
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