Incorrect super block on a disk

Greg 'groggy' Lehey grog at
Sat May 3 17:52:08 PDT 2003

On Saturday,  3 May 2003 at 16:57:57 -0700, Paul English wrote:
> Hi,
> 	I have a disk that I sent out for data recovery. The recovery
> place returned my data on another hard drive. I'm trying to mount the
> relevant partition of said hard drive. When I do I get:
> mount: /dev/ad1s2e on /mnt: incorrect super block
> When I try to fsck, I get:
> it tries for an alternate superblock, fails and then I try doing
> fsck -b 32 (as recommended in the manpages) and I get the same error.
> Is there anything I'm doing wrong or something else to try?

It seems pretty certain that whatever they sent back from the data
recovery house is not a UFS file system.  You should try to find out
how they got the data there.  I can't imagine them creating a new file
system.  Until you know that, there's not much point trying
alternatives, though some of them exist.

> Can I somehow regenerate the super block?

Regenerating super blocks is simple: that's what newfs(8) does.  The
trick is keeping your data.

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