It is a problem of Fedora. I also had gone through the same problem and wait a sleepless night before I install. Don't worry......do not believe the media check which will tell you that installation from this disc will cause problem. I have installed and the installation is great successful. Belive me....go ahead with install with your CDs. You can see in this forum that several people find this problem but all they were succeeded at last. Just look in this forum page by page and you will find similar problem.