I use a SD card on the 650 once in a while just because it has no WIFI capabilities. So when I want to load a book or some news collected through Calibre, I put them on the card. That way I don't have to plug the device to the computer and wait for it to be charged or have to stop the charging process. On a 650 it's impossible to read while it's plugged to a computer.
The lack of card on the Mini doesn't bother me at all.
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