I have a Buslink DVD-/+R machine which I think is a NEC RW ND-1300A. It uses Roxio Drag-to-Disc 6.1.1.48 on my XP desktop

I have been using DVD-X Copy Platinum to back up my DVD's. I find that with the -R DVD's about half the time, the burn produces a DVD that will only play on the computer that burned it. This pseudo coaster will work on either the NEC burner or my Pioneer DVD drive on the same XP machine. The other half of the time the -R produces a DVD that works on pretty much any other machine.

I have used many different kinds of media including Riteks and I still get the problem.

The only thing that seems to predict this is when theDVD I am backing ujp is kind of a longer one, but even this is not always the case?

When I use +R, I don't have any problems.

Also the defective -R doesn't work on my notebook computer (it is a Dell with a +R burner, but when the -R disc works, it plays fine on the notebook)

This happens with either DVD X Simple or advanced mode.

Any advice will be appreciated. Thanks