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If you tried to play one tape in your home VCR once a day for 22 years, it might wear out long before the goal was achieved (yes -- either the tape or the VCR!). But a Voyager tape setup, which records all the probe's observations, would not. It's designed to handle just that.

To think of it another way: A Voyager tape head should not begin to wear out until the tape has been moved back and forth through a distance comparable to traversing the United States. Hasn't happened yet.