Try a lower speed this time, say 2x. It sounds like the reading drive is not the burning drive, there are two machines, is that correct?
Sometimes a DVD burner is advertised as having high speeds but this doesn’t mean it will reliably work on all media at high speed. More so if the burner is older. I made a few toasters with 16x media because I stupidly let k3b choose auto. When I constrained the speed to 4x, it worked fine.
ken thanks for the advice.
But I can’t select any lower than x4 speed
I do have 2 burners but they are both in the same box. I’m now trying with the other burner but it’s slowest speed with the dvd’d I have is x6 speed.
But initially the reading drive was the burning drive.
I’ll let you know how I get on