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Date:      Thu, 30 Nov 2000 16:02:42 -0800 (PST)
From:      John Baldwin <jhb@FreeBSD.org>
To:        "Jose M. Alcaide" <jose@we.lc.ehu.es>
Cc:        stable@FreeBSD.org, rnordier@FreeBSD.org
Subject:   Re: The trouble with boot0
Message-ID:  <XFMail.001130160242.jhb@FreeBSD.org>
In-Reply-To: <3A26E955.C103AD88@we.lc.ehu.es>

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On 30-Nov-00 Jose M. Alcaide wrote:
> John Baldwin wrote:
>> 
>> Look at the geometry in your BIOS setup and make sure that the geometry
>> fdisk
>> uses matches the geometry in your BIOS exactly.  If it doesn't, then you
>> will
>> have to re-partition with the correct geometry I'm afraid.  Or you can try
>> lying to your BIOS and telling it that your disk's geometry is 3037/88/63,
>> but
>> I doubt that that will work...
>> 
> 
> I'll try that tomorrow at work. But, if this is a geometry problem,
> why can I boot from ad0s1 and ad0s2, but not from ad0s3? Typically
> the geometry problems prevent booting from any slice. In addition,
> boot0 is working in "packet mode".

packet mode doesn't use the starting C/H/S, it uses the starting offset.  Also,
as long as the you have the sectors right, ad0s1's starting C/H/S is ok. 
However, if you have the cylinders and/or heads wrong, then the C/H/S for ad0s3
is bogus.

--

John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/


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