If you get a finalize error when using Overburn, that means that your disc drive doesn't support that payload. You can truncate games and some will work but most will give errors when you're playing them and boot you to the dashboard, regardless of installing. I've heard some people say that if you play music from the 360 guide button while playing, it makes it less likely to get these errors. While I have no personal confirmation about it, I do know that you're much less likely to get that error when you're playing a game rather than sitting in a game menu. This could be because the 360 prioritizes loading the game over verifying the game is legitimate, which may be why the supposed music method works. I do hope that they're backups of games that you own as well.