8.0-Beta installation problem -- Unable to find /dev/ad0s1b

[Jin Guojun]

dd 1m zero on the drive and rerun the 8.0Beta4 DVD. Created two slices S1 and S2,
and did auto labling (unix partiton) on S1, hit W, the problem persists.

Boot system with freeBSD 6.4, and 6.4 sees two slices (MBR partitions) S1 and S2, 
but no any Unix partition (ad0s1a, ad0s1b etc) on S1.

Boot back to 8.0-Beta4, it still sees not Slice created. 
At this point, it is obviously that 8.0 looks in a wrong MBR location --
8.0 created slices can be seen by 6.4 but not 8.0 itself.

--- On Mon, 9/14/09, Thierry Thomas <thierry at FreeBSD.org> wrote:

> From: Thierry Thomas <thierry at FreeBSD.org>
> Subject: Re: 8.0-Beta installation problem -- Unable to find /dev/ad0s1b
> To: "Jin Guojun" <jguojun at sbcglobal.net>
> Cc: bugs at freebsd.org, freebsd-stable at freebsd.org, current at freebsd.org
> Date: Monday, September 14, 2009, 10:06 PM
> Le Lun 14 sep 09 à 23:08:53 +0200,
> Jin Guojun <jguojun at sbcglobal.net>
>  écrivait :
> > I do not enve know how to make "dangerously dedicated"
> disk, and the
> > 8.0 may do this sliently.
> 
> No, I don't think so! But such a problem may arise if your
> disk had been
> installed as "dangerously dedicated" in a former version.
> Unfortunately,
> previous versions of sysinstall have created uncorrect
> labels, and the
> new gpart in 8.0 does not see them.
> 
> In that case, you have to boot kernel.old and wipe out the
> bad label. If
> you reboot with a 7.2 kernel, can you see your missing
> partitions?
> -- 
> Th. Thomas.
>