Small GPT partition written to 3Tb external

How to use TestDisk to recover lost partition
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LamentingAussie
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Joined: 05 Jun 2017, 09:22

Small GPT partition written to 3Tb external

#1 Post by LamentingAussie » 05 Jun 2017, 09:41

Cgrenier do you answer everyones questions single-handedly? :) youre like a gift from above : :D

Some additional info for my problem might be found in this breif conversation? http://forums.debian.net/viewtopic.php?f=17&t=133338

I am trying to get my head around the nature of the recovery task in front of me. there are four subforums (partition. File system. Undelete. Etc) and im not even sure which I need to try first.

There was a 3Tb usb external plugged into windows 7 pc so it was maybe ntfs, no problems until I tried to clone a tails OS onto a usb stick and instead chose the 3Tb as the desination :oops: (all data will be lost!) It didnt complete successfully (not designed to go on large storage) but I remember seeing "formatted as fat32" then an error about gpt not found mrb found (or something similar). This hapoened in minutes so surely the 3Tb is mostly intact.

The installer was supposed to use gpt to create a 2.5gb partition (invisible to Windows) and leave the remainder of the device unpartitioned.

Which approach should I be taking to recover valuable files from the almost 3tb of unpartitioned space? Maybe the backup mbr?

And since the installation failed maybe even the 2.5gb fat32 volume is up for grabs (if the OS wasnt written there) but really there is just some small files I will do anything to recover.

Thanks in advance cgrenier :mrgreen:

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Re: Small GPT partition written to 3Tb external

#2 Post by cgrenier » 06 Jun 2017, 19:58

Use testdisk 7.1-WIP, EFI GPT, Analyse, Quick Search and if necessary Deeper Search.
TestDisk should find your NTFS partition using its NTFS backup boot sector.
When the partition is listed set it to P(rimary). On next screen, choose Write, confirm, BackupBS, confirm, Quit

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