full-disclosure - Erasing a hard disk easily

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From: Jos at meltemi.co.uk (Jos Osborne)
Subject: Erasing a hard disk easily


>However i have been informed that equipment exists to retrieve data that programs on a normal >system cannot. Hence the writing multiple times with all 0 then all 1 then all 0 will cycle >>the disk so that it is virtually impossible to determine the residual data (please note all >1 means all bits are 1).
>
>My two bits

0 and 1 by any chance?

;P