misuse command dd, how to recover

[Richard Shaw]

On Sun, Feb 6, 2011 at 9:20 AM, cheng chen <freakrobot at acm.org> wrote:
> Hi all,
>
> I just input a wrong output device file of the dd command
>
> it should be "dd if=xxx.iso of=/dev/sdc"
>
> but I input "dd if=xxx.iso of=/dev/sdb",
>
> so my hard disk partition is ruined. The xxx.iso is just 3GB, but I have
> 400GB data in the disk which means other data are still there.
> Is there anything I can do to get the files back to me. It's partition type
> is NTFS.

You overwrote a lot more than the partition table but I have had luck
with testdisk in the past. It's available on System Rescue CD, or in
the fedora repos if you still have a bootable system.

It worked to recover my NTFS partition but I only overwrode the
partition, not the data.

Richard