Re: More on the Lower Merion school district webcam debacle

[Valdis.Kletnieks () vt edu]

On Sun, 09 May 2010 02:36:21 EDT, der Mouse said:

> A real low level format involves laying down completely new timing
> tracks and such, and will destroy all data unless you're willing to
> open the drive in a cleanroom and look at residual magnetization
> patterns and the like.

There is approximately *zero* actual real-world evidence of the "read the
residuals" actually working on any disk drive less than 15 years or so old. It
was already difficult on the old MFM formatted drives that Guttman did his
paper about.  If you have any *real* evidence of *anybody* recovering from even
a single-pass "dd if=/dev/zero" over-write anytime this century, I'd be glad to
hear about it.

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