[clug] Recovering disk geometry after whole disk dd

[Neil Pickford]

When I have done this all I have had to do is boot from a floppy and 
reapply lilo to fix things up in the MBR.

Is your damage more extensive?

Maybe I have been lucky with similar geometry's so it has not mattered 
too much.

Neil Pickford
VK1NP

Michael Still wrote:
> Hi.
> 
> You might remember my question about copying root file systems to new 
> disks from a week or so ago. Well, I'm home now and had a chance to 
> actually do the deed. I thought I was being terribly clever, and just 
> plugged the new disk in and did a dd from the old disk to the new.
> 
> It turns out I'm not nearly as lucky as I thought. That copy worked, and 
> the machine is functioning again, but in the process I copied the MBR 
> from the old disk to the new disk. This means that fdisk et al now have 
> the wrong geometry for the disk.
> 
> So, this raises new questions:
> 
>  - how can I recover the geometry for the new disk?
>  - how can I overwrite just the geometry bits of the MBR with the 
> correct information?
> 
> Thanks,
> Mikal