Your xbox 360 is not reading your disk what do you do

Seems like the disk drive (and/or laser) has broken.
Before fixing this issue, try and clean your disk drive lens laser with a disk cleaner.
Hopefully in your case the laser is just dirty.

Always make sure that the video game disk is clean as well, any scratches will cause the disk to not read properly.

If the disk drive as broken, you can either send it back to Microsoft or fix it yourself by buying the drive on ebay and replacing it yourself.