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Home > Archive > Unix administration > May 2007 > erase a disk
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| bAggarbunkern 2007-05-25, 1:19 pm |
| How to format or erase a disk with only software using, so it will
not
contain any info for forensic detectives to discover?
Disk might be any formated before of NTFS, unix or linux containing
important coporative information.
Destruction is not an option in this case.
Any one?
best regards,
Jan
p.s. Sorry for my other post.
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| Doug Freyburger 2007-05-25, 7:18 pm |
| bAggarbunkern <jan.fr...@gmail.com> wrote:
>
> How to format or erase a disk with only software using, so it will
> not contain any info for forensic detectives to discover?
> Disk might be any formated before of NTFS, unix or linux containing
> important coporative information.
>
> Destruction is not an option in this case.
>
> Any one?
It depends on how certain you want to be and what vendor UNIX
you have. Note that US military only allows destruction above
some level of classified data.
On Solaris use format - analyze - setup for 5 passes of random
data - purge.
For other vendors use dd with if=/dev/random if available,
if=/dev/zero if not, of= the overlap partition, do 3-5 passes.
Either should be good enough for commercial purposes. I have
never bothered with more than 1 pass outside of classified work.
| |
| Russell Wood 2007-05-26, 7:21 am |
| On 2007-05-25, Doug Freyburger <dfreybur@yahoo.com> wrote:
> bAggarbunkern <jan.fr...@gmail.com> wrote:
>
> It depends on how certain you want to be and what vendor UNIX
> you have. Note that US military only allows destruction above
> some level of classified data.
>
> On Solaris use format - analyze - setup for 5 passes of random
> data - purge.
>
> For other vendors use dd with if=/dev/random if available,
> if=/dev/zero if not, of= the overlap partition, do 3-5 passes.
>
> Either should be good enough for commercial purposes. I have
> never bothered with more than 1 pass outside of classified work.
To add to the list; dban <http://dban.sourceforge.net/>.
It's as easy as booting from a CDROM and choosing one of the listed
methods for wiping the disk.
- Russell
| |
| Moe Trin 2007-05-27, 1:22 am |
| On 25 May 2007, in the Usenet newsgroup comp.unix.admin, in article
<1180133135.239433.226830@u30g2000hsc.googlegroups.com>, Doug Freyburger wrote:
>bAggarbunkern <jan.fr...@gmail.com> wrote:
[To the original poster - please don't post the same article to
multiple news groups. If you MUST do so, list all of the groups
separated by commas in the "Newsgroup:" header, and set a Followup-To:]
[vbcol=seagreen]
[vbcol=seagreen]
>It depends on how certain you want to be and what vendor UNIX
>you have. Note that US military only allows destruction above
>some level of classified data.
"This is the basis for requiring defense contractors to use Clearing
or Sanitizing per DOD 5220.22-M (for re-use or for disposal,
respectively) of media containing data classified as Confidential or
Secret, while requiring NSA-approved degaussing and destruction for
Top Secret media."
>On Solaris use format - analyze - setup for 5 passes of random
>data - purge.
Linux - "/sbin/badblocks -w $DEVICE"
>For other vendors use dd with if=/dev/random if available,
>if=/dev/zero if not, of= the overlap partition, do 3-5 passes.
Yup
>Either should be good enough for commercial purposes. I have
>never bothered with more than 1 pass outside of classified work.
Problem - if the smart hard drive controller has secretly discovered
a bad spot on the platters, modern controllers will "copy" the data
and move it to a replacement "space" sector. The data is still on
the old sector, and _MAY_ be recoverable by merely resetting the
controller bad blocks list.
Old guy
| |
| Renato Golin 2007-05-29, 7:23 am |
| -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
bAggarbunkern wrote:
> How to format or erase a disk with only software using, so it will
> not
> contain any info for forensic detectives to discover?
> Disk might be any formated before of NTFS, unix or linux containing
> important coporative information.
>
> Destruction is not an option in this case.
Do you have an NMR nearby?
- --renato
- --
Reclaim your digital rights, eliminate DRM, learn more at
http://www.defectivebydesign.org/what_is_drm
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| |
|
| Renato Golin wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> bAggarbunkern wrote:
>
> Do you have an NMR nearby?
>
> - --renato
Might work if you get the disk close enough - but could be very
expensive if you quench the magnet!!
>
> - --
> Reclaim your digital rights, eliminate DRM, learn more at
> http://www.defectivebydesign.org/what_is_drm
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| |
| Dave Hinz 2007-05-29, 7:21 pm |
| On Tue, 29 May 2007 13:15:53 +0100, Renato Golin <rengolin@gmail.com> wrote:
>
> bAggarbunkern wrote:
[vbcol=seagreen]
> Do you have an NMR nearby?
A B0 magnetic field won't do it; you need a biasing frequency to get the
bits to flip to anything. There's a 5 Tesla magnet inside many hard
drives, more or less, a few millimeters from the edge of the platter,
most MRI scanners are at 1.5T. It'd also be astonishingly unwise to
take a hard drive into a scan room.
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