Re: erase a disk
- From: ibuprofin@xxxxxxxxxxxxxxxxxxxxxx (Moe Trin)
- Date: Sat, 26 May 2007 21:05:39 -0500
On 25 May 2007, in the Usenet newsgroup comp.unix.admin, in article
<1180133135.239433.226830@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, Doug Freyburger wrote:
bAggarbunkern <jan.fr...@xxxxxxxxx> 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:]
How to format or erase a disk with only software using, so it will
not contain any info for forensic detectives to discover?
Destruction is not an option in this case.
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
.
- References:
- erase a disk
- From: bAggarbunkern
- Re: erase a disk
- From: Doug Freyburger
- erase a disk
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