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From: "Karel J. Bosschaart" <karelj@kayjay.nl>
To: freebsd-questions@freebsd.org
Date: Wed, 23 Mar 2005 17:36:52 +0100
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cc: Timothy Smith <timothy@open-networks.net>
Subject: Re: installing 4.10 AND 5.3 on one system
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On Tuesday 22 March 2005 23:35, Timothy Smith wrote:
> is it possible to install 4.10 and 5.3 on a single system? i'm need them
> for testing a various times but i've only got the one system for them both.
> i tried myself, but i ended up with getting "not ufs" error msg after
> the boot prompt, it did show 2 freebsd options however.

Yes that should be possible, but be aware that FreeBSD 4.x cannot read the 
UFS2 filesystem, which is the default for 5.3. Therefore the 4.x boot loader 
cannot boot 5.3, probably that's the problem you are seeing.

Try reinstalling the boot loader using the 5.3 CD.

HTH,
Karel.