By chance is the media Dynex, the meida code is one that is found in that brand.
If so, I have had to burn at 1X speed to get a good backup and then it was iffy. I would suggest you try and DVD5 media made in Japan and burn at 4X and see if you get a good burn, bet you do.
Also,
1Click 4.2.9.2 does not need "copytodvd" is has its own burn engine as an embedded .dll.