I just went to Staples today to buy some more blank DVD's. Usually I get DVD-R's, but I also noticed DVD+R's. What's the difference? The price and packaging were exactly the same except for the following: On the Maxell ones, the only difference was that the DVD+R's said they are compatible with 2.4x burners whereas the DVD-R's are compatible with 2x burners. I also noticed that the DVD+R said it could contain up to 8 hours of video???? and the DVD-R said up to 6 hours??? But both were 4.7GB (Single Layer) What's the difference?