I am new to a DVD recorder. I got one after my VCR went and thought I knew what I was doing. I am using a RW disc to record on. I am using the timer to record shows and thought that I set it long enough for a 2 hour show but didn't. What mode do I set it on say for a 1, 2, or 3 hour show? I see it has auto on it and wondered if I should just set how long the show is and then use auto mode? Any help would be appreciated