Quote:
Originally Posted by clayesq
That you both! The "format:false" worked... the results we rather distressing, but I have a backup of my books elsewhere, so...
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Formats:false says Calibre KNOWS they are missing (you did
something 
to delete that (whatever it was) format).
If something else went behind the skirts (used the OS or you had a drive fail),
Calibre would still think they were there, and that would NOT list those books.
Note: If you ran
Library Maintenance: and had it
fix 
found errors. The DB now matches what is there.

You should have been asking WHY! , first and try to recover (the metadata might be to your liking and all you needed was to replace the format. Add, usually means you start over with the metadata).