Mar 102013
 

About a week ago, I was doing some HDD benchmark tests and I accidentally specified the boot drive as the source for a test. Oops. Everything was OK. Until I rebooted.

It would not boot. I figured I knew what happend. I’d munged my boot code. And I knew how to fix it. However, I didn’t realize that I’d also deleted the boot partition.

I asked on the FreeBSD dev IRC channel. db confirmed that I’d trashed my boot partition. Even with that hint, I didn’t see that the partition was gone.

Here is what the partitions looked like:

screen shot of gpart

I asked for help on the FreeBSD forums (always a good source). But before that solution came in, I got advice from hrs:

[17:59]   dvl: you freed freebsd-boot partition at 34 for some reason.
[17:59]   # gpart bootcode -b /boot/pmbr ada0
[17:59]   # gpart add -b 34 -s 94 -t freebsd-boot ada0
[17:59]   # gpart bootcode -p /boot/gptboot -i 1 ada0
[17:59]   should restore the partition and boot block.

And he was exactly right. I owe this man a beer. Here are the commands I entered:

commands

I also had to renumber the device within /etc/fstab, but that is outside the scope for this problem.

I rebooted and I had my system back.

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