thanks for the input. I like the half-the-burn-speed idea. I just used whatever clonedvd2 put as the defaults. I figure - It is the expert, not me.
On the bad source media, invariably, when I tried the original it worked.
On using quality blank media, I am not sure what is a quality platter. I use maxell dvd+r. I DO know I had tried sony , and I tried -R, too, but I cannot recall when ones had a higher screw-up rate.
I always single taskwhen doing these copies.
You gotta be a comuter scientiest to figure that stuff out. That's why I asked for an automated method of verifying.