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There's a need to distinguish between two problems:
- poor storage leading to physical degradation such that the media cannot be read - HarryT's point about Nasa magnetic tapes is pertinent;
- obsolescence of the media reading device technology. For example, how easily can we now play an old 78 rpm gramophone record? How about a phonograph? I have a friend, one of whose jobs is to rescue old film from forgotten storage. I understand from her that there's only one organisation in the UK now able to transfer old nitrate film to DVD.
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