[rashkae]

Originally Posted by davidfor

Actually, unless the replacement file is exactly the same size, an updated book will be removed and then added as a new book.

But, the KoboTouch driver in calibre cheats. If you resend a book, it updates the stored file size in the database to prevent this from happening. This basically because I find it much more useful to not treat the update as a complete replacement. And if I did need to, I can always delete the book from the device first.

.....

Ummm, would there be a way to disable that feature?