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I doubt that calibre uses the reported size of the books to determine how much data to write, although I could be wrong. Chances are it uses a call to the operating system to see how much free space there is.
It is possible to overfill your ereader using calibre, as I did it once by putting on an audio book when I was very low on space (PRS-T1)
IIRC the next time I connected the ereader calibre could not write the database, so I had to delete something(probably the audiobook) and all was well again.
I would not worry too much about it, but you could check the file itself on the ereader and see what size the operating system reports.
Helen
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