Quote:
Originally Posted by FraggleRock
I tried to delete books through de Windows 7 file manager
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Don't do that, instead use the remove function on the device itself to delete books (long press on the book title in the library, select Remove from the menu that pops up).
You can add books by copying them from the computer to the device's filesystem and then safely ejecting the device using the computer's eject function. Everything else you should really do either using the functions on the device itself, or using a program like Calibre that understands how to update the device's database, unless you know what is safe to change manually.
Edit: If your database has become corrupted then you can start fresh with a new database by logging out of your Kobo account as Ken described above.