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Date: Thu, 1 Nov 2012 21:39:59 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Leslie Jensen <leslie@eskk.nu>
Subject: Re: My freebsd partition changed by Windows chkdsk
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On Thu, 1 Nov 2012, Leslie Jensen wrote:

>
>
> I've replaced my dual boot hard drive with an SSD.
>
> My hard drive had one 100 GB windows partition and one 300 Gb Freebsd slice 
> with five partitions (/, /usr, /var, /tmp and /home).
>
> In order to move my Win7 partition a Norton Ghost program was supplied with 
> the new disk.
>
> When trying to clone that partition the process couldn't finish because it 
> needed a chkdsk command to be executed before cloning.
>
> I ran a chkdsk c: with the choice of correcting errors.
>
> Somewhere in that process the chkdsk program touched my freebsd partition in 
> a way so that it now is recognized as NTFS.
>
> That I trusted the chkdsk program to do what I told it to do was in 
> retrospect a bit naive ;-) I do have a backup although it's not as recent as 
> I would have liked.
>
> Can you think of any way to perhaps recover the data from the freebsd 
> partition?

If all it did was change the partition type, that should be easy to 
change back with gpart modify.  Untested example below, make a backup of 
the disk as it is right now first.  Clonezilla will make a (large) 
binary backup.

# gpart modify -i2 -t !165 ada0