1. Put a CD or DVD into your MacBook's Superdrive. 2. Wait for it to spin up a bit. 3. Tilt your MacBook slightly. Hear that noise? That's your MacBook going to town on your shiny CD/DVD. All I was doing was carrying the thing around while it had optical media in it. It wasn't even playing, but the DVD was spinning, and the slightest tilt made an awful grinding noise. What's the deal? Anybody else have this? I have a newest revision Blackbook.