Analog Disks May Outlast Their Cd Rom Ancestors

BLASTING LITTLE PITS IN A CD-ROM may seem to be a durable way to preserve computer data. After all, holes in the road don't disappear unless someone fills them. But CD-ROM pits have a pernicious tendency to fill themselves with molecules that migrate from the surrounding material. What's more, the digital format used to record the data may be superseded by some newer standard. So don't count on being able to retrieve such archived data 50 years from now.

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