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Being a computer science major, I am aware of the database concept that Calibre uses and let Calibre completely manage its folders.
I get books from a variety of places. The Amazon purchases are in “My Kindle Books” and all others go in “My ebooks” folders. The Caliber library is in its own folder. The books are then added to the Calibre library, using Calibre, from the other folders. The problem occurs when the ebook sources for a given author are different and the author name is reversed from the other ebooks by the same author.
Calibre then uses that to create a separate folder. An example would be “Pendleton, Don” versus “Don Pendleton”. When I update my ereader, I use a MS Surface 3, I use Calibre to write the ebooks to a network disk and then update the Calibre library on the MS Surface 3 with those epub books exported by Calibre.
I had tried the solutions mentioned above, but they didn’t seem to work. My problem was basically me. I would make a change and then check to see if the folder issues were resolved. Seeing the folders still there I assumed the changes didn’t work. Dumb mistake on my part. I should have checked the contents of the folder. I would have seen the one I wanted to go away was empty and the changes did work.
I haven’t found a way to have Calibre clean up empty folders.
Bottomline, you are right HarryT, don’t mess with the database unless you know what you are doing and have the software to do so.
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