Just out of interest:

When I'm backing up my computer to DVDs, my DVD drive takes a while to burn the disk, like several minutes. Doesn't this build up lots of heat inside my computer, which might be harmful? I don't want a disc-o inferno on my hands.

And what happens to all that aluminum (I think it's aluminum) that's getting vaporized - is the residue building up somewhere inside the drive?

Steven