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    SubjectRe: Secure deletion
    On Thu, Jul 23, 1998 at 09:14:44AM -0400, Richard B. Johnson wrote:
    > If you don't need 'instantaneous' security, i.e., you can clean up
    > your disk(s) once a day, just make a program that writes a file,
    > filled with "SECURITY ", until the disk partition is full.
    > Close the file, sync the file-system, then delete the file.

    This probably won't work for a block that has been reused in another
    file, but where the whole block hasn't been overwritten by the new
    file. Let's say I have a 100k file, delete it and create 100 1-byte
    files which occupies the blocks from the 100k file (blocksize 1k).
    Then there will be 1023 bytes in each block which are allocated, but
    with unknown state. Whether they are overwritten by 0s or not written
    at all is unspecified.


    Alexander Kjeldaas, Guardian Networks AS, Trondheim, Norway

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