Making PCB with DVD Writer
Sorry, teak, but no go. Chris Stratton hit the weak spot. Even blank writable CDs/DVDs have a series of readable bits already on the disk. This establishes what is called the data spiral. If you cover this up, the electronics will have no way to sync up to the disk position. 

On a related note, your idea is actually something close to LightScribe, http://en.wikipedia.org/wiki/LightScribe but as far as I can tell not close enough.