So for the past few months I have experienced an intermittent issue which seems to be getting worse. Several of my games have begun displaying a DISK UNREADABLE error then booting me back to the dashboard. Most notably Arkham City and New Vegas. I have the old style 360 with an attached 20GB hard drive. I have followed all the suggestions on microsoft's official support site with no luck and am hoping there is a better option then sending in my system for $100 repair. Any thoughts?