Here is the legitimate solution. If you want to play campaign, xbl, etc. and get all of your features to work on Reach. Buy a cheap MU or if you have internal MU your set. MU = Memory Unit. Move your gamer profile to the MU or internal MU. You'll have to do an update if you want to play XBL but for internal MU users, this is no issue as there's somewhere around 250 MB of space. Now take off that HDD. Start it up without the HDD. This is a free and easy fix. It took me all of two seconds. Actually, load times are much faster too. I started at 50 % loading the last mission. It's not the disc and it never was. It must have been associated with the HDD. It could be an isolated instance of success, but I would suggest to everyone who feels like there is no solution to at least try it. It's free and easy. It's better than selling it. However, I would almost (key word) guarantee that this will work any and everywhere.