Re: Advice regarding servers and Wiping Drives after testing

["Jim Nelson" <jnelson () nmsu edu>]

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