Thank you everyone. The problem is solved. I did the disk check but did not complete it as it was taking a lot of time, that is why my answer is late as today. Then I tried to use the drive on another PC and after it finished reading the drive content I found the books in the Library Folder. Then I tried it on my PC and everything was there. So I believe the problem was fixed.
Now this Library is corrupted, and I would like to move the whole library to another external hard disk, to use it with a portable Calibre there. So I need to recover the books and move them PARTIALLY to the new drive, because moving them all at once will take days in Calibre. Can someone guide me to the steps necessary to accomplish my plan?
I am thinking to copy the "metadata_db_prefs_backup.json" to the new library in the new hard disk and then run the Calibre there and do the recovery by using the "Restore Database" option. Then making several folders in the old hard disk, each containing specific amount of books. Then Adding the books to the Calibre in the new hard disk from the old one, each folder at a time.
Is that a proper way to do it?
Thank you
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