Q. A brief description of your specific problem and what you've tried to fix it. Please do not recap the thread. A. Directly after the first mission (where the guy takes the helmet out of the large monitor) it comes up with this read error, clean disk message (even saving just before, just go see if it will ever continue, has never resulted in it proceeding). After the first time it failed, i installed the game to the HD. However after installing it successfully, this did not solve the issue and failed at the same place with the same read error, clean disk !! (This makes me wonder what data is loaded from disk if installed to the HD or is the read error actually not the real reason for the failure). I then tried to clean the cache, with no luck. I then tried to play the game without the HD, again with no luck, same message at the same place... Q. Remove your hard drive and play through the same sections of ODST that are failing. Does that make a difference? A. No Q. Put in Halo 3 and play through a the first few campaign missions (on easy, it'll go quick). Do you see the same behavior as in ODST, or does it function perfectly? A. Yes (same error, actually i could not even start!!, meaning after the first cut scene when starting the solo campaign). It's this xbox isn't it!! Halo 3 worked just fine before. I'd just like to add that other games I play do work. I wonder why? [Edited on 12.05.2009 3:27 AM PST]