Ah, okay. I haven’t actually made many coasters, though, just one. The disc I’m working with now is +RW rather that +R so I can erase and rewrite it forever.

My disc now exactly matches his disc, for better or worse. It plays perfectly in the computer, but no other player, DVD, BD, etc. recognizes it as anything playable. I suppose I could try it on my PS4 but I doubt that would be any different. I’ll mess with it some more tomorrow afternoon, I guess.

Thank you for all your help, and apologies my incessant noobishness.