Xbox Doesn't Read Disks Anymore?

My xbox won't read any disk any more, I tried playing Black Ops 2 and just as I get into the main menu, it freezes or says "Disk Unreadable". I tried playing Minecraft which is downloaded to my Xbox, which I do not own a disk for, and it also said "Disk Unreadable". I don't know what is going on, I've cleaned the disks very much too and still nothing works. GTA 5 doesn't work, and neither does Cod Ghosts.