click here seems to indicate that it is one way of getting a nearly dead drive to work just long enough to image or create a back up. No apparent explanation as to why this should work or who tried it first. If it is an urban myth then quite a few people seem to believe it. If true it may have something to so with the contraction of metal drive components. Or more esoteric affects on the disk itself, but I suspect we would need a semiconducter expert to answer that.