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 <[email protected]> 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 > [email protected] > https://gtalug.org/mailman/listinfo/talk >
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