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I have CDs that are 25 years old
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I can't believe that CDs have been around for 25 years. Time does fly. In any case, I do remember that some of the early CDs had their share of problems with the coating. Fortunately, those problems got fixed pretty quickly.
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the best recording medium would probably be a hard drive,
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The problem with hard drives is that they are mechanical and they are so big now, that they're difficult to backup to a medium that can be stored (i.e. tape) Optimally, a good storage would be semi-permanent memory that keeps it content even when there is no power and can be changed when there is need. I don't know if anyone remembers bubble memory but that was a technology that never quite got off the ground.
Bob