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From: "Daan Vreeken [PA4DAN]" <Danovitsch@Vitsch.net>
To: Svein Halvor Halvorsen <svein-freebsd-questions@theloosingend.net>
Date: Mon, 18 Oct 2004 14:45:15 +0200
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cc: FreeBSD-Questions@FreeBSD.org
Subject: Re: 128 GiB+ disks on Intel PIIX4
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On Monday 18 October 2004 14:30, you wrote:
> [Daan Vreeken [PA4DAN], 2004-10-18]
>
> >  dd if=/dev/ad1 of=/dev/null
> >
> >  If it succeeds without errors, you should also be able to write the
> > entire disk.
>
> It is not possible that the controller will rotate when it reaches its
> 28bit address barrier, and that the controller will return the first part
> of the disk, when asking for the last?
I don't believe that is possible without the kernel complaining, but I'm not 
100% sure.
To be really 100% sure you'll have to fill up the disk and re-read it...

grtz,
Daan