The problem with saving data on a CD/DVD is a well known problem. A Cd can`t last forever. I don`t have any exact info about this but this IS a very well known problem.
"What is the lifetime of CDs, diskettes, ZIP disks, hard drives, tapes, etc.?
Professionals working intensively with diskettes and hard drives tend to trust them for only up to five years before they feel a need to copy the data to a new medium or to a new unit of the same medium.
The lifetime ranges of certain media under standard storage conditions (23°C and 50% relative humidity) are:
- Read-only CDs (factory stamped): 5 to 100 or more years depending on disc manufacturing quality
- CD-Rs (Compact Disc Recordable): 5 to 200 years depending on disc type and manufacturing quality
- CD-RWs (Re-Writeable): 5 to 100 or more years depending on manufacturing quality
- DVD, DVD-Rs, DVD-RWs (Digital Versatile Disc, Recordable, Re-Writeable): not much data is available for DVDs, but its lifetime is generally expected to be similar to that of a CD
- Tapes: 10 to 30 years
- Diskettes and Hard Drive: 5 to 15 years
Storing diskettes in hotter and more humid conditions than recommended will reduce the lifetime ranges stated above; cooler and drier will extend their life.
The lifetime of the media is one aspect of longevity; the life or popularity of its playback machine is quite another. The media may survive for 100 years, but the technology to play the media may have disappeared in that time. Replacement machines might disappear from stores before you have made the change to a new format - for example, 5.25 inch diskette drives are hard to find nowadays."
http://www.preservation.gc.ca/info/faq_2_e.asp#2
"The media will have become obsolete long before the data have decayed. That is, CD-ROMs are our longest-lived media now (a century has been claimed), but the CD is already becoming obsolete. The specifications for the replacement technology, the DVD, include a requirement of backward compatible, but what will be the next storage medium? The CD, after all, is only a few years old. Of course, even useable CDs will have files that are inaccessible because of changing software within a couple of years."
http://aic.stanford.edu/sg/emg/he_paper.html
THE FUTURE
"It looks like a transparent little bit of crystal but changes into a extremley effective storagedisc when lightened with the right kind of laser. the crystal can storage up to 1 Tbit per cubic centimetre." (translation by me..i know..i suck.)
http://hem.passagen.se/hassi/texter.html (Swedish site)