Mailinglist Archive: opensuse (3138 mails)

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Re: [SLE] wipe, clean, etc
  • From: James Knott <james.knott@xxxxxxxxxx>
  • Date: Mon, 06 Dec 2004 11:11:11 -0500
  • Message-id: <41B4849F.8010008@xxxxxxxxxx>
Jeffrey L. Taylor wrote:
This isn't sufficient for a sufficiently determined and resourceful
adversary. E.g. the intelligence services of major countries and
corporations.

Magnetic disks are analog, not digital. E.g., setting a bit to 1 then
0 results in a slightly different magnetization levels and spatial
patterns than setting it to 0 twice.

However, each time you overwrite, the orginal data gets pushed further down into the noise, making it more difficult to read. Eventually, a point will be reached, when it's impossible to tell the original data, from the noise. There is IIRC, a specified number of overwrites, with different patterns, so that the disk is considered fully erased.




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