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Weblog:   Please, For the Love of All That's Recoverable, Shred Your Hard Drive!
Subject:   Great
Date:   2005-03-02 12:13:25
From:   myc18
Great tip. Knoppix Hacks is an incredible book. But what is the difference between this technique and the US Department of Defense disk clearing and sanitizing standard DoD 5220.22-M ("Overwrite all addressable locations with a character, its complement, then a random character and verify")?
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  • Kyle Rankin photo Great
    2005-03-02 12:38:40  Kyle Rankin | O'Reilly Author [View]

    Thanks.

    The primary difference between shred and the DoD standard is that shred writes a random character on all passes (except for the last pass if you use -z) instead of just the last pass. Two passes of dd the first writing a one, the second a zero, followed up by shred -n 1 would perform the DoD method. The idea behind the shred method is that since each write is random, it's more difficult to piece together legitimate data after the fact.
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