8.0 upgrade & geometry does not match label

[Michael Powell]

Reinhard Haller wrote:

> Hi,
> 
> as far as I know my disk is not operating in dangerously dedicated mode.
> Despite this I'm unable to upgrade to freebsd 8.0. Here is what the
> gpart, mount, bsdlabel say.
> 
[snip]
> 
> I remember problems with the initial sysinstall because of geometry
> problems -- the only way to get FreeBSD installed was to dedicate all of
> the available space to FreeBSD.

The geometry warnings are mostly a cosmetic error and generally can be 
ignored. Especially the one in sysinstall.
 
> I've found a suggested solution to repair the mbr/label problem with
> 
> dd if=/dev/zero of=/dev/ad4 count=1 oseek=1
> 
> and a warning not trying it on boot disks.
> 
> Is there a better / safer solution around?
> 
If there is I do not know of it. This is what I did when I had this problem:

http://www.mail-archive.com/freebsd-questions@freebsd.org/msg227610.html

-Mike