[GTALUG] restore GPT partition table?

[Matt Price]

oh man, all of that looks really helpful, folks.  At work now (with my
laptop safely plugged in and not hibernating!!) -- I will try when I get
back home.  I'll report back when I'm (hopefully) successful.


On Tue, Oct 25, 2016 at 8:22 AM, Jamon Camisso via talk <talk at gtalug.org>
wrote:

> On 25/10/16 12:33, Matt Price via talk wrote:
> > OK, so I did this
> >
> > dd if=some.iso of=/dev/sdb
> >
> > oops -- that's not the USB key! that's my internal m.2 drive!
> >
> > The partition table is gone, but it used to contain 2 partitions, both of
> > them in an LVM, one of them part of an extended logical volume that added
> > space to /home on my overburdened main drive. I haven't lost much data
> > (just the first 700mb were overwritten), and amazingly my laptop
> continues
> > to run just fine -- even though lvscan reports a missing drive,
> apparently
> > the data is still findable.
> >
> > I'd like to restore the partition table but I don't know where the
> > partition boundaries are, and in any case I don't know how to write a
> > partition table (!). What tools should I use? Preferably without turning
> > off my laptop, since I'm afraid it won't boot back up again!
>
> Apart from the data loss, right now you're in a good position to recover
> things.
>
> First, make a copy of /proc/partitions for reference in case you need to
> restore from it.
>
> You have a few options:
>
> 1. Restore LVM since you're using that:
> https://access.redhat.com/documentation/en-US/Red_Hat_
> Enterprise_Linux/7/html/Logical_Volume_Manager_
> Administration/mdatarecover.html
>
> Those backups have saved me on multiple occasions.
>
> 2. testdisk is a great tool for these kinds of problems. Download and
> run it from /dev/shm. It may not find the deleted partitions or see in
> memory stuff, but it won't hurt to try.
>
> 3. Use your /proc/partitions as a reference, since it has a list of the
> partitions from before the dd operation. With it you could reconstruct a
> partition table if the LVM restore steps don't work.
>
> http://prefetch.net/blog/index.php/2009/12/20/using-
> the-linux-parted-utility-to-re-create-a-lost-partition-table/
> for more on that approach.
>
> Good luck!
> ---
> Talk Mailing List
> talk at gtalug.org
> https://gtalug.org/mailman/listinfo/talk
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gtalug.org/pipermail/talk/attachments/20161025/f711e046/attachment.html>