Originally Posted by Purple Lady
I guess my question should have been - What facilities does calibre have for devices that you cannot use if you use save to disk?
It treats the folder as a device and all books in the folder show in the "On device" column. You can click on the device view and see what books are in the folder. You can adjust the Folder Device interface plugin to set the priority of what format should be sent first if more then one exists or adjust how the books are sent. You can use the metadata plugboard to customize the metadata sent in the books sent to the folder.
For more check out the manual