How to safely remove rest of GTP?

[Andrey Fesenko]

On Fri, Dec 30, 2016 at 7:00 PM, Alan Somers <asomers at freebsd.org> wrote:
> On Fri, Dec 30, 2016 at 5:44 AM, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
>> How to safely remove rest of GPT?
>> Disk have actual data (part of ZFS), I am don't need to destroy this
>> data.
>>
>> GEOM: da6: the primary GPT table is corrupt or invalid.
>> GEOM: da6: using the secondary instead -- recovery strongly advised.
>> GEOM: da22: the primary GPT table is corrupt or invalid.
>> GEOM: da22: using the secondary instead -- recovery strongly advised.
>> GEOM: da6: the primary GPT table is corrupt or invalid.
>> GEOM: da6: using the secondary instead -- recovery strongly advised.
>> GEOM: da22: the primary GPT table is corrupt or invalid.
>> GEOM: da22: using the secondary instead -- recovery strongly advised.
>
>
> dd if=/dev/zero of=/dev/vtbd1 bs=8192 count=2
>

>> secondary instead

It's last sector on the disk