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    SubjectRe: Wanted: Secure-delete utility for Linux
    Date
    Dave Cinege wrote:
    |>
    |> Shail Bains wrote:
    |> >
    |> > Dunno of an equivalent for WipeDisk, though...
    |>
    |> dd if=/dev/zero of=/dev/hdX : >
    |>
    |> To be really sure I think that should be followed by /dev/urandom
    |> then zero again.

    Why urandom ? The safest way to destroy all information on disk should
    be to reverse _all_ magnetic particles (flip and flip back)
    |>
    |> AFAIK DoD military grade wiping is zero->random->zero->random->zero.

    A better scheme would be 10101010 - 01010101 - 11111111 - 00000000

    BUT:

    if I write a bit pattern to the disk - how is it stored ?
    Remember, CD data are re-encoded to avoid long 1 or 0 patterns.
    I'd guess, with fuzzy bit stuffing nowadays harddisk use similar
    techniques... so perhaps a "all ones / all zeroes" pattern is
    re-encoded to something that is near ...01010101010...

    --
    Steffen Grunewald = steffen(at)gfz-potsdam.de = fax +49-331-288-1266
    My opinions are mine. You can rent them. Just ask me for prices :-)
    "Art is a lie which makes us realize the truth" - Pablo Picasso

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