Let me be a little more specific. I'm trying to ask about functionality. I know what the physical difference between the machines is.
* can a standalone DVD recorder be used to make back-up DVDs?
* can a standalone DVD recorder be used to make or work with data DVDs?
* can a DVD burner make a recording of a VHS cassette?
* would using a capture device be the only way to use a DVD burner to make a copy of a VHS?
I am wondering exactly how these two devices differ in terms of functionality and what is the overlap, if any.