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Originally Posted by Caleb666
You are talking about modifying the files itself... but doesn't Calibre write metadata in a separate OPF file (and the database), or does it actually modify some file formats (like EPUB and MOBI?).
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Calibre can modify the metadata in many formats. It does this during save-to-disk and send-to-device. It does not modify metadata in the formats stored in the library unless you do a convert.
The OPF file is a backup of the metadata stored in calibre's database. Calibre reads this file only when restoring the database.
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In the case of file formats it doesn't understand, I still can edit and update metadata, it just doesn't get saved in the file itself, right?
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Yes.