I filled my Glo to overflowing through Calibre. After 400 accepted books it refused to add anything and had an official 0 bytes left. That meant that I couldn't write to the SD card either, probably because there was no room for the updated database on the internal card. I don't know about swap files, but I would leave a few Mb free internally. After all, you have a card slot, why not use it?
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