there is an urban myth that many/most drives will use the motor as a generator to provide power to finish writing the current block and park the head. It is generally false -- all drives you're likely to encounter happily write random stuff if voltage drops while they're writing, even if they do park the head afterward.
I can easily believe that the motor generating power is fantasy, but I always assumed there was a capacitor in there that could supply enough energy to finish writing the current sector. Why wouldn't there be?
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