Most people don't really think about it, but optical media, particularly the stuff you burn at home has a limited shelf life. Worse yet, depending on the quality of the disk, its probably a lot less than you might think. This is but one of many reasons why DVDs typically make lousy long term backups, that is of course, unless you have a burner from a new startup company called Cranberry . Its new optical technology called "DiamonDisk" claims to have a useable life of more than 1,000 years, or to put it in layman's terms, about 900 more than any of us would care about.
The durability of the disk is apparently a result of the media itself containing no dye layers, or adhesives / reflective materials that will deteriorate. Data is also said to be etched far more deeply into the disk using its proprietary burner. Currently a drive will set you back about five grand, but just in case you find this a bit extreme, you can also upload your data to the company's website and let them burn it for you.
Anyone considering this for a time capsule might also want to toss in a drive for good measure. 1,000 years from now a DVD is likely to be about as useable as an 8-track. Lets just hope they still use USB!