No, I'm afraid there isnt. In order to exclude things calibre first needs to scan the device to present the user with the list of folders to exclude. Someday I might get around to implementing a fast initial scan mode that ignores files and so presents on a list of folders, but at the moment there is no way to avoid the full scan. What you can do today is temporarily move your comics off teh SD card and just leave an empty folder. Then connet calibre and tell it to ignore that folder and then move the comics back.
|