Who ever wrote this article didn't present it properly as it was misleading, in that one might think that the article is speaking about a quick erase using windows or even a full format. In such a case of a quick erase it would be possible to to recover some data. However, thankfully, they updated the article to include the original paper because the author of the original paper is talking about using a pure magnetic signal to perform the erase in which case it very well might be possible using such a method to only need one pass.

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Link to this comment: http://www.securityfocus.com/comments/newsbriefs/888/2778#2778