I don't know anyone who's brave enough to have done this to their Xbox 360 system (considering all the hardware issues that it already has), but if you've modded your console to play burned games, you might not want to download the December update. The December update officially bans modded Xboxers, so you will not be playing Halo 3, or Call of Duty 4 on-line..... Ever!!!
That's a steep price to pay to play burned games kids.
[Crunchgear]