Why doesn't my burned DVD play anymore?

Episode 1185 (2:20:17)

Guido from Baldwin Park, CA

Guido burned a DVD a few years ago and now it won't play. Leo says there's a thing called "CD rot," and it happens to DVDs as well. The metal layer of the DVD can actually rot, preventing it from being played. It may also be that the dyes have faded. It also could be that he burned it and didn't finalize it. Then he just can't play it.