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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: Geom not found, disaster recovery plan on FREEBSD 7.2 STABLE
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Jeronimo Calvo wrote:
> Ho folks,
> 
> As a plan for a recovery planing due to a crash on a kernel Update,
> when restarted I used to have F1 Freebsd and F2 Other, I choosed F2
> wich seems to belong to an old linux installation and a Grub-error pop
> up, after restarting again, Freebsd completly dissapear booting just
> that Old-Crashed GRUB plan...
> 
> On an attempt to recover the normal behaviour I tried booting from a
> Livecd and restore the freebsd boot loader MBR on my first disk doing:
> 
> Fixit# fdisk -B -b /boot/boot0 ad8
> 
> seems to write the MBR but when is asking to overwrite the partition
> table it is giving me an error:
> 
> Geom not found...
> 
> I tried several times, as well as using "fdisk -BI ad8" wich gives me
> the same error...

This particular error in your particular circumstances can be ignored.

I think the old loader (GRUB) simply changed the "active" partition 
index in the MBR, you don't need to reinstall the boot loader - change 
the active parition.