booting from wrong disk

PJ af.gourmet at
Thu Oct 15 16:07:17 UTC 2009

PJ wrote:
> While trying to learn and understand the dump-retore process, I messed
> up the ad4s1a partition and could not boot. To fix it I restored a
> dumpfile of ad12s1a which is, for all intents and purposes, the same as
> ad4s1a. I then boot from ad4 and surprise, surprise...
> #df shows we have been booted from ad12 and all partitions are ad12....
> Booting from ad12s1a gives exactly the same results.
> So, how can I get ad4s1a to boot from ad4?
> I imagine it is something in the boot files... but how to fix that?
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I see from the boot process that this should fix it...
# fdisk -B -b /boot/boot0 ad4
how do I get this onto the right disk? If I boot from ad4 or ad12 and
change the mbr, then it will be the ad12 that will be booting from ad4
and vice versa... or have I got it wrong? But in the end, I suppose it
really doesn't matter, or does it?

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