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My hard drive with GPT format was overwritten by accident. I ran dd over it when I tried to write an .iso to an USB memory.

$ dd if=Ubuntu.iso of=/dev/sda

Then I tried to fix my partition table with a Linux live and gdisk but didn't work. I ran:

$ gdisk r # recover and transformation option b # use backup GPT header c # load backup partition from disk w # write table to disk and exit

Now I can't mount any filesystem. When I run mount /dev/sda6 /mnt I get:

Mount: /dev/sda6 is already mounted or /mnt busy

I'd like at least mount the filesystem to save my data to a backup.

Mokubai
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Juan Je García
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  • Take the disk out, put another disk in. Install Ubuntu on the new disk. Put the old disk in an external case. Make an image of that disk to a third disk, or - much better - write it to an iso-file. Then mount that third disk, mess with it, do what you need. Don't touch the original disk anymore. Next: make a backup! – SPRBRN Dec 16 '16 at 14:34
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    Possible duplicate of [How do I recover lost/inaccessible data from my storage device?](http://superuser.com/questions/241817/how-do-i-recover-lost-inaccessible-data-from-my-storage-device) – DavidPostill Dec 16 '16 at 15:02
  • It's a large amount of data. The hard drive is 1TB capacity. Would I need a larger amount of storage to write an .iso, right? – Juan Je García Dec 16 '16 at 15:06
  • If money isn't a problem, buy a 3 or 4TB disk, and after solving these problems, this will be your backup disk. You can get 3TB 2.5" drives for a reasonable price. That gives you enough space. I can recommend the Photorec program from one of the answers of the duplicate link above. After formatting an Ext4 disk to NTFS I could still get most data off that disk. When the partition table is gone, filenames and dates are gone, but unless the data is overwritten, the files are still there. – SPRBRN Dec 16 '16 at 17:08

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