Re: [Fedora 14] Linux hard disk shredder?

On 04/15/2011 02:11 PM, unruh wrote:
On 2011-04-15, Eef Hartman<E.J.M.Hartman@xxxxxxxxxx> wrote:
unruh<unruh@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
Yes, and to no purpose. The first dd pass will have gotten rid of
everything so that noone, not even the three letter agencies can
retrieve it anyway.

Not really. Even the 7-pass "govermental security wipe" still leaves
remainder magnetism on the disk so some data can be reconstructed.
OK, it will take a LOT of work with specialized equipment.

Sorry, not anymore apparently. The work that was originally done was on
1990 era hard disks ( remember when a 10MB disk was a huge disk and it
was the same size as the recent TB disks?) which used the disk space
very very inefficiently. Modern disks are far more efficient in their
use of the disk space. If the disk left over readable stufff that would
mean that that could be used to squeeze more daa onto the disk.

Note also that if you feel that tsomeone would find it profitable to
spend $10000 on recovering your disk, then physically desroying the
disk, which costs your $100 seems certainly worth it.


Hehe, a short trip in the fireplace or the oven does the job :-)




PS: I believe, but couldn't find it that quickly, the
Standard of DOD 5200.28
is wipe with zeroes, wipe with ones, repeat this 3 times, then wipe
with a random partern.

Uh, that was a directive from 1988. It is completely outmoded. It has
nothing to do with reality anymore.



I _did_ find a reference to a Peter Gutman option, whichs wipes all
of the data with special algorithms using 35 passes.

Again, ancient history. Might as well tell us what Julius Ceasar did to
preserve secrecy.

.

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  • Re: [Fedora 14] Linux hard disk shredder?
    ... Even the 7-pass "govermental security wipe" still leaves ... remainder magnetism on the disk so some data can be reconstructed. ... it will take a LOT of work with specialized equipment. ... use of the disk space. ...
    (alt.os.linux)