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Date: Sun, 30 Nov 2008 15:09:53 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Tsu-Fan Cheng <tfcheng@gmail.com>
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Cc: FreeBSD <freebsd-questions@freebsd.org>
Subject: Re: does not understand "df -H"
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> Filesystem     Size    Used   Avail Capacity  Mounted on
> /dev/ad0c      484G    429G     17G    96%    /ad0c
>
>
> there should be more disk space available based on what is shown. why
> is this like that??
>
man newfs
man tunefs

you used default options with newfs i think, including 8% space 
reservation