Now for a serious answer.
I been told DVD's and CD's wear out after several years. Verbatim and Taiyo-yuden included.
Is that so? Are they not immortal?
Plastic is not immortal?
Yes, writable optical media wears out. If you Google you'll find out that it's not plastic, but a malleable dye (varies based on brand and kind) that the laser on your drive can etch without much problem. This is what degrades.
How long can the burnt data last without corrupting or becoming inaccessible thus forever lost?
The estimate is 5-10 years for most brands in ideal conditions, though some of the more poorly made brands can go much sooner. Also, they can go in much shorter time (a couple of weeks) if conditions are less than ideal. Using RW disks moves this estimate downward. Personally I give most disks a maximum of a year or two. Given this problem (which I've run into on some data with particularly), I tend to burn a file of MD5 hashes of the other files on the disk to that disk so they can be checked if suspicion of corruption arises.
Edited by Glenn9999, 28 February 2011 - 01:19 AM.