Assuming this is valid, after ~69 years, we can assume that half of the sectors in a hard drive would be corrupted (since they all lost half of their strength by this time). Most sources state that permanent magnets lose their magnetic field strength at a rate of 1% per year. For hard drives, there are three main factors: magnetic field breakdown, environmental conditions, and mechanical failure. The longevity of the data stored on any drive depends on the conditions where it is stored and for how long.
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