Maybe you ran out of space. Maybe it just needs a lot of time to digest all of that.
I managed to load up 700 books before I ran out of space. Some of my books were quite large. PLus there are the 100 pre-loaded books too. (I like to test the limits of my new toys.)
But I also found that when I tried to load up more then 400mb at a time it looked like my Kobo crashed or hung. In reality it just took 30-50 minutes to process the new files into the data base.
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