My freebsd partition changed by Windows chkdsk

[Warren Block]

On Fri, 2 Nov 2012, Leslie Jensen wrote:

> I use sysinstall and fdisk to find the disk, and I get

Please don't use sysinstall for this or any disk formatting.

>    Offset   Size(ST)      End     Name  PType       Desc  Subtype    Flags
>
>         0         63         62        -     12     unused        0
>        63     256977     257039   ad12s1      4    unknown       22
>    257040  163702350  163959389   ad12s2      4 NTFS/HPFS/QNX        7
> 163959390  812813778  976773167   ad12s3      4 NTFS/HPFS/QNX        7
>
>
> It's ad12s3 that's my freebsd slice
>
> gpart show ad12s3 returns
>
> gpart: No such geom: ad12s3
>
>
> How do I proceed?

I don't see why gpart doesn't see that.  Please show the output of 
'gpart show ad12'.