Not my area of expertise, does this story make sense? If not, what parts do not and why?
"But hard drives are insanely complex devices. The technology that's in there is truly astonishing. And there are a great many things that all need to be working perfectly for something that complex to succeed. So, do the heads need to be functioning? Yes, of course... but so, too, do a great many other components. For example, if the head tower positioner bearings become “wobbly” — game over. Or if the positioning bearings develop too much friction — again, game over. Or if the values of any of the critical components in the heads' read-channel amplifiers go out-of-spec — game over. And on and on."
Source:
https://forums.grc.com/threads/hdd-not- ... post-11948
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Joep -
http://www.disktuna.com - video & photo repair & recovery service