Geom not found, disaster recovery plan on FREEBSD 7.2 STABLE

[Jeronimo Calvo]

Hi, how can i change that value on the MBR?

2009/12/18 Ivan Voras <ivoras at freebsd.org>:
> 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.
>
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