first off i have burned 50 plus movies at this point I use dicriptor , shrink and nero. i have an emprex 16x burner. my first 50 were done using great quality 4x r+ dvd's -no coasters worked great. i just bought great quality 4x- dvds and now i have nothing but problems. i have to burn slower and half the time the movie gets to 100% burn and then as its writing the lead out the burn fails. i almost think the dvds are a little to short? i have been thinking about moving my controls in shrink to manual and adding a little more compression.to leave some room. And yes i plan on buying some better ty dvd's to test.