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It can be a real problem, though. Eg, in the early 1980s, the BBC had a massive project to create a "snapshot" of comtemporary British life - pictures, video, etc. The end result was produced as a laserdisc controlled by a special version of the "BBC Micro" personal computer of the day. It was intended to be used as a long-term research tool. Now, a mere 25 years later, it's pretty much useless because the hardware to play it no longer exists.
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