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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
walking drives
An occasional failure mode of magnetic-disk drives
back in the days when they were huge, clunky {washing
machines}. Those old dinosaur parts carried terrific
angular momentum; the combination of a misaligned spindle or
worn bearings and stick-slip interactions with the floor could
cause them to "walk" across a room, lurching alternate corners
forward a couple of millimeters at a time. There is a legend
about a drive that walked over to the only door to the
computer room and jammed it shut; the staff had to cut a hole
in the wall in order to get at it! Walking could also be
induced by certain patterns of drive access (a fast seek
across the whole width of the disk, followed by a slow seek in
the other direction). Some bands of old-time hackers figured
out how to induce disk-accessing patterns that would do this
to particular drive models and held disk-drive races.
[Jargon File]
(2009-05-14)