Quote:
Originally Posted by Hellmark
Calibre keeps the metadata separate from the ebook files, since not all ebooks allow for metadata (or Calibre can't edit due to DRM). Usually, Calibre keeps the info in a file called metadata.opf in the same directory as the books it is meant to. If transfering your library, make sure this gets copied too.
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The metadata is kept in metadata.db in the library root. The metadata.opf file you are referring to in each directory is a backup of metadata for a single book, but it isn't used except for recovery. The critical file to copy over is metadata.db, which will move with the entire library if you copy the folder containing the library.