From owner-freebsd-fs@freebsd.org  Tue Sep 22 20:29:28 2015
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Date: Tue, 22 Sep 2015 14:29:26 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Chris Stankevitz <chris@stankevitz.com>
cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>
Subject: Re: Name/label/id metadata: how do I make it go away
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On Tue, 22 Sep 2015, Chris Stankevitz wrote:

> On 9/22/15 7:42 AM, Warren Block wrote:
>> ZFS on bare devices uses an EFI label that is similar or related to GPT.
>> Those might be detected and displayed even without GPT, but I'm not sure.
>
> Thank you.  I'm using google to figure out what FreeBSD utility will allow me 
> to query the EFI label.  After I find that I'll read the man page.  Then I'll 
> use the tool to see if I can read/write the label.

Do not mess with ZFS's stuff.  It might be touchy about that.