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    SubjectRe: Wanted: Secure-delete utility for Linux

    On Tue, 22 Dec 1998, Charles Cazabon wrote:

    > Actually, it's all-bits-zero, all-bits-one, all-bits-zero. This prevents
    > people from reading the previous data from residual magnetic fields underneath
    > a disk which has simply been wiped with zeroes, etc. The complete cycle for
    > each bit is enough to minimize this risk.

    'badblocks -w' does this multiple times. So someone could use badblocks to
    do a secure deletion ...

    - clifford

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