How to remove boot partition from a secondary SSD

Hi! I've replaced my SSD 128G with a 1TO NVME as my system drive: FREEBSD14.1 UEFI + GPT.
Now I want to add the old SSD to my system as a new ZFS pool.
How do I proceed to fully erase UEFI boot partition and format the whole drive as ZFS pool ?
 
Assuming you don't want to retain any data on the drive: gpart destroy to clean out everything, then zpool create.

More "advanced use" would typically manually create a new partition table via gpart create, then a new parition gpart add and attach a GPT label.

See gpart(8) and zpool(8) for more info.
 
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