My wife has got a bunch of Pilates DVDs. Each one is only 1.2 gigs. I have DVD shrink which I use to back up the kids DVDs (in case you don't know, those critters can tear up a DVD). How do I combine mulitple DVDs to put onto one DVD+R? My wife hates having to change DVDs in the middle of a workout, each one is only 20 minutes.