Halo 4 Disk Problem

For some reason I cant play infinity because when it begins to load the level, with the sphere, it freezes and says this disk is not readable. So what i did is that i went back to the store, they saw that there were no scratches and replaced the disk no problem, i played the new disk and same thing, this disk is not readable. Mulitplayer and the previous missions work, just not that one level.

Have you tried reinstalling the content from Disc 2? Sounds like you corrupted the install process first time around.

how would I go about uninstalling disk 2 to re install disk 2.

delete the Halo 4 MP content from Hard drive then reinstall disk 2. can’t tell the specify file name because I’m no where near my Xbox. I think it’s call infinity Multiplayer under Halo 4 or just look for the halo 4 file that’s 8GB

just wondering, will this delete all my multiplayer stats?

ok so I uninstalled the 7.3 GB Halo 4 game, didnt lose any of my stats, and campaign works now!
Thanks for all the help!