I've wondered about that. Considering the
inevitable decay of
aluminum CDs as well as now nearly-free CD-R media, will there
be a demand for very smart readers in the future that might
be able to rescue otherwise unreadable data?
Copy your aluminum CDs, CD-ROMs, and silver CD-R to gold CD-R before the
bits fall off. Gold CD-R lasts at least five times as long as the
silver crap. Kodak published a white paper explaining how they were
comfortable with giving gold CD-R a *conservative* rating of 100 years
data retention (when stored in a reasonable manner).