how to save back partition table

[NoOp]

On 10/04/2010 05:38 AM, loody wrote:
> Dear all:
> I accidentally dd about 7MBytes to /dev/sda1, and it cause my HD
> cannot be recognized by ubuntu.
> Is there any way to save it back, no matter use any tool under XP or ubuntu?
> appreciate your help,
> miloody
> 

dd it back from a liveCD?

In addition to what Franz provided:
https://help.ubuntu.com/community/DataRecovery
http://manpages.ubuntu.com/manpages/lucid/man8/fdisk.8.html
http://manpages.ubuntu.com/manpages/lucid/man8/cfdisk.8.html