On Mon, 26 Sep 2016, John Baldwin wrote:

On Tuesday, September 27, 2016 12:36:22 AM Ngie Cooper wrote:


On Sep 26, 2016, at 22:48, Ernie Luzar <luzar...@gmail.com> wrote:

...

This little script has been posted before. Maybe it will be what your looking 
for. Called gpart.nuke

#! /bin/sh
echo "What disk do you want"
echo "to wipe? For example - da1 :"
read disk
echo "OK, in 10 seconds I will destroy all data on $disk!"
echo "Press CTRL+C to abort!"
sleep 10
diskinfo ${disk} | while read disk sectorsize size sectors other
do
# Delete MBR and partition table.
dd if=/dev/zero of=/dev/${disk} bs=${sectorsize} count=1
# Delete GEOM metadata.
dd if=/dev/zero of=/dev/${disk} bs=${sectorsize} oseek=`expr $sectors - 2` 
count=2
done

Why not just use "gpart destroy -F provider"?

That doesn't always work.  In particular, if a disk was partitioned with GPT
and then you use normal MBR on it afterwards, the 'gpart destroy -F' of the
MBR will leave most of the GPT intact and the disk will come up with the old
GPT partitions, not as a raw disk.

Right. So do a gpart destroy -F of whatever is on there, ignoring errors, then a gpart create -s gpt. Now there is definitely a secondary GPT, and a final gpart destroy -F removes it cleanly.
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