[nycbug-talk] drives swapped around - bad superblock

[Alex Pilosov]

On Fri, 31 Aug 2007, Judd Maltin wrote:

> I find it very interesting that I can mount /dev/ad6s1c just fine, that
> /dev/ad5s1c also mounts just fine.. but not when I reboot.  I get bad
> superblocks.
what's the exact error?

> So, I've been a Linux guy for some time, so I try to fsck -t 4.2bsd
> /dev/ad5s1 (guessing at the type from the above):
> 
> # fsck -t 4.2bsd /dev/ad5s1c
> ** /dev/ad5s1c
> BAD SUPER BLOCK: VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST
> ALTERNATE
> /dev/ad5s1c: NOT LABELED AS A BSD FILE SYSTEM (unused)
why are you specifying the -t option? what happens if you don't?

> That partition holds all of our backups for the past 6 months.  I can't
> lose it.  Oh, and it's in California.
If you can mount, copy data away, trash it. Safer than messing around when 
you aren't sure what you are doing.

> Uh-oh.  This is where I stop.  I need a FreeBSD superhero at this point.
>  I need to perform a little surgery here on this disk, slice and
> partition, and I don't want to mess up.