From owner-freebsd-hackers@FreeBSD.ORG  Wed Mar 29 04:05:01 2006
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Date: Tue, 28 Mar 2006 21:05:24 -0700 (MST)
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To: ederbsd@gmail.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Direct access to hadware
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In message: <9dd63e580603281516jee694b6sa7274b48c25f98c8@mail.gmail.com>
            Eder <ederbsd@gmail.com> writes:
: Hi all,
: 
: I would like to know if exite some header ".h" in FreeBSD so
: that I can make a direct access to hadware in machine with C.
: 
: The intention is to make some things as, for example, to record ' FFFF ' in
: first
: the 512 bytes of hd or to record one floppy with ' FFFF ' of track zero.

create a file with all ffff's.  dd if=file of=/dev/ad0.

Warner