On Sat, 2019-01-26 at 11:04 -0800, Samuel Sieb wrote:
> On 1/26/19 2:47 AM, Patrick O'Callaghan wrote:
> > On Fri, 2019-01-25 at 22:43 -0800, ToddAndMargo via users wrote:
> > > On 1/25/19 9:38 PM, fred roller wrote:
> > > > You can wipe your drive with:
> > > > 
> > > > dd if=/dev/zero of=/dev/[device to be wiped]
> > > 
> > > /dev/zero is the fastest I have found.
> > 
> > All that does is set every bit to 0. Since magnetic domains have
> > hysteresis, suitable equipment can recover the previous state at a
> > physical level. That's why proper trashing takes several passes.
> 
> Sure, but do you expect someone to find your hard drive and put that 
> much money and effort into extracting your data?  For most people, it's 
> just that you don't want some random person finding your hard drive in a 
> second hand store and checking out your files.

I don't "expect" anything, but without knowing the OP's use-case, none
of us can say what's cost-effective. I merely pointed out that a single
pass with /dev/zero is not proof against even commercial-grade
recovery, let alone military grade.

poc
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