Quote:
Originally Posted by kovidgoyal
1. updates only metadata, it does not affect internal structure.
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That's what I thought. I have occasionally told people who want to update the metadata in formats stored in their library to do 2. However, I have worried that could affect internal structure when all they want is a metadata update per 1.
I probably should recommend a Save to Disk, followed by replacing the library copy format with the updated Saved format copy.
For me it makes little difference, but some people do access the formats directly. They may have an external editor set up to handle that format instead of Calibre's viewer. Calibre passes the internally stored format directly from the Library to the OS associated program instead of updating metadata first.