Test for valid formats
Partly as a result of sloppy housekeeping and partly as a result of a failed hard drive I am in a bit of a spot.
Somehow a fair number of the books in my library have "lost" their files. The books show up in the virtual library, but when I want to send the to my device I get an error message. I then have to go look for the book in my backups.
Is there a simple way that Calibre can verify the entire library?
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