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Security Basics: Re: Advice regarding servers and Wiping Drives after testing

Re: Advice regarding servers and Wiping Drives after testing

From: Jim Nelson <jnelson_at_nmsu.edu>
Date: Sat, 1 Sep 2007 10:38:40 -0600 (MDT)

All modern drives have built in erasure firmware. Good research summary
http://cmrr.ucsd.edu/people/Hughes/CmrrSecureEraseProtocols.pdf

Jim

> Can someone explain why anything would be left after running :
>
> dd if=/dev/zero of=/dev/hda
>
> Wouldn't this write zeros across the entire disk? How could anything
> be recovered afterward?
>
> I see osx disk utility can with write zeros once, or write zeros many
> times. Is there any advantage in multiple writes?
>

Jim Nelson, Ph.D.
New Mexico State University
Received on Sep 04 2007

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