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.