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Date: Sun, 22 Feb 2004 15:52:38 +1100
From: Gautam Gopalakrishnan <gautam@inspired.net.au>
To: "Eric F Crist" <ecrist@adtechintegrated.com>
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cc: freebsd-questions@freebsd.org
Subject: Re: Mounting a 5.2 filesystem on a 4.9 system?
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On Sat, 21 Feb 2004 20:24:57 -0600
"Eric F Crist" <ecrist@adtechintegrated.com> wrote:

> Hello all,
> 
> I'm really screwed up my server last week, now I'm giving up on the
> 5.x series as a server for a while, so I've installed 4.9.  I took all
> my backup files and placed them on a second harddrive in the system,
> hoping to just mount that drive on the new 4.9 system and restore the
> necessary files.  However, I cannot mount the filesystem.  From
> DiskLabel in/stand/sysinstall, I can see that it is /dev/ad1s1d, but
> when I type:
> 
> mount /dev/ad1s1d /backup
> 
> I get an error:
> 
> mount: /dev/ad1s1d on /www: incorrect super block

The default filesystem on 5.x is UFS2 which I think 4.9 can't read.
Maybe you could just ftp/scp it from your 5.x machine or run NFS.

Hope that helps
Gautam