As I said, having made the disc in the NEC RW, it reads (plays) in the Asus - both installed in the PC. However in the Sony in the DVD player for the TV it is no longer good.
I have no other drive to try and from what you say it could be the disc. This could be reinforced by the experience I had with verification. Am I right?
How about the drops in buffer during burning, are these likely to be involved?
I need to be pretty sure as if it is the discs then I`ve nearly a hundred which are of little use to me!!