full-disclosure - Re: Stealthier Internet access

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Message-ID: <88689.1274824877@localhost>
Date: Tue, 25 May 2010 18:01:17 -0400
From: Valdis.Kletnieks@...edu
To: Bipin Gautam <bipin.gautam@...il.com>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Stealthier Internet access

On Wed, 26 May 2010 03:01:26 +0545, Bipin Gautam said:

> @Valdis: Those were from some ooold notes, (~4yrs) :) if you have full
> hdd encryption wiping hdd header and backup header few (7?) times and
> rest hdd with 1 random pass should be enough.

My point is that even if the drive *wasn't* encrypted, a single-pass overwrite
is sufficient to render it unrecoverable.

> Wiping Magnetic storage is tricky on its own.

It's actually not that hard, as long as you actually know how many gauss
you *really* need to wipe a device (inside surface, near axis, of multi-platter
devices is a particular gotcha).

It's not worth worrying about wiping the remapped sectors on a disk - even an
older 40G drive has some 80 million sectors on it - so even if you have a few
hundred sectors that have remapped due to I/O errors, it's still literally
a one-in-a-million shot that anything incriminating is in the sector.  Plus
it's a *bad* sector, so reading and recovering the data is a bitch...

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