A newer version disc does a firmware change and makes older discs obsolete. You might try doing a disc copy on your computer and try different media for your current version disc.Any news on this problem. I've got a bootlegged 07' disc and whenever the Nav/radio gets warmed up, I get the "disc error" message as well. Damn annoying because it sets the message/corrects itself, then sets it again and again. Won't do it in colder temps 'till the radio's warmed up (hot to touch), and will almost always do it if the car's been sitting in the sun with high outdoor ambient temps.
Freakin' annoying, and I'm expecting my dealer to claim it's the bootlegged disc. Putting in the OEM 06' disc isn't working either, the radio refuses to download. Claims it's not the latest version.