It is a micro SD. I did notice my Kindle updated right before this started happening.
I realize I broke it. I was so happy when I got all my books on it, I just kept going and going. I have a problem with that. I would just uninstall CC and reinstall, but I have books from 2 different computers and 2 different Calibre libraries on the fire.
I will let you know if I ever delete enough books so it acts differently. Unfortunately, ES File Explorer doesn't list files by date, so I can't mass delete all the newer ones, for example.
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