It seems with any high profile game launch on the Xbox 360 comes some reports of hardware issues. Halo: Reach is one such major title, and now reports are flooding in of users unable to play the game due to getting dirty disc errors.
Users reporting the error tend to be running the older 20GB Xbox 360, though other models of the original console, including the Elites, don't seem to be immune.
Microsoft responded to the problem with no clear solution, but directed anyone experiencing the issue to contact customer support.
We are aware of a very small number of customers reporting that their copy of Halo: Reach is causing a "disc read" error. Those affected should contact Microsoft customer support at 1-800-4MY-XBOX for troubleshooting assistance.