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From: Pete French <petefrench@ingresso.co.uk>
Cc: 
Subject: Re: 3TB disc and block alignment
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> Why may it hurt ? How may it hurt ? Which sector is written to by
> this 'gpart' command ?
>
> As far as I understand, GPT writes some stuff at the beginning and
> the end of the harddisk.

Yup, this is true.

> How/why will the newfs overwrite those parts ?

Because you are also giving it the whole hard disc to write to, instead of
a partition within the hard disc, so you will end up scribbling on what you
wrote with the gpart command.

-pete.