Your dvd player might not support dvd+rw. If you don't know check
here. You can't just copy a dvd movie. Most dvd movies are dvd9(dual layered) or two 4.7 GB media. That is why it won't fit on a dvd-r. My Patriot copy is 7.59 GB. Read the tutorails on
doom9.net to either put the movie on two discs or take out extras and try to put it on one disc.