This. If you don't have Brasso then toothpaste (yes really) can work, although maybe not if it's that scratched. Worth a try though - worst thing that can happen is you'll be 5mL down on toothpaste ...

I have a CD-ROM that is quite scratched (those nasty circular ones...the drive it was in must have been borked somehow). Needless to say, it won't read past a certain point so I need to find out if I ...