Originally Posted by davlewis
One question, I if just sync (drag all books) from Calibre back to my PRS-505 will it duplicate all of the books, or is it smart enough to detect the book is in place and not duplicate the book? Or should I delete all books from the PRS-505 first and then sync everything back to the PRS-505?
It plays safe & only automatically overwrites books that it itself put on the Reader, so delete them 'manually' before syncing. (Note that you can do that from within Calibre itself, though.)