Don't bother. Wiping the disk twice is enough. If you are storing state
secrets melt the disk.
Back in the days of sub 1G disks it might have been possible to get inter
track gap data that was usable. Maybe. But not multi T disks.
Sectors mapped out are a problem though, and multiple writes aren't going
to touch those. If you encrypt the disk I question how much value a few
encrypted sectors would be to anyone.
Worry far more over lost usb sticks or portable usb disks. That's a far
bigger problem.
STeve Andre'
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On January 11, 2018 9:46:25 AM Andreas Thulin <andreasthu...@gmail.com> wrote:
Hi!
Again, an ignorant question (as usual):
How might I do something similar to
# dd if=/dev/one of=/dev/sd0 bs=1M
as a complement to the usual and well-described
# dd if=/dev/zero of=/dev/sd0 bs=1M
followed by
# dd if=/dev/urandom of=/dev/sd0 bs=1M
in order to achieve paranoid disk-wiping?
BR
Andreas
