Quote:
Originally Posted by excaliber
I have deleted many files in the calibre library directory (not the directories and the metadata.opf files), not within calibre itself. Before someone asks why I did this way, the reason in the library were file formats which I didn't want like .txt or .zip files or small size .pdf files and it was easy for me to mark and delete all these kind of files with a file manager.
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It would have been just as easy to delete them from within Calibre.
You can do various complicated filtering, based on file formats, sizes, and many other criteria ...
Calibre is a powerful database.
All you needed to do was ask here ;-).
When you perform library maintenance, check library, you have to select Fix errors.
Calibre then corrects the list of file formats associated with each record.
Then you can delete books that have no file format associated.
The easiest way would be adding your own column, selecting "quick add formats" and then sort by the column "Formats".
The first will be books without any file format associated.
See, you still have to use Calibre interface, even after deleting files manually ;-)