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An ext4 partition of Hard Disk is formatted to ext2 and then again to ext4 using GParted. Is there a way to recover the original data?

I want to reconver .webm files. I could not do this with testdisk.

  • try to find backup partition tables with wipefs. do man wipefs for info. and stop formatting disks you don't want to format! – mikeserv Jun 27 '14 at 9:10
  • testdisk, or more specifically photorec, is your best bet here. it supports webm files - but it only works well for unfragmented data. – frostschutz Jun 27 '14 at 12:32
  • @frostschutz: Is there a way to search for .webm files with testdisk instaed of all files? – user62511 Jun 27 '14 at 12:41
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I accidentally formatted an ext4 partition to NTFS in my Ubuntu 16.04 recently and was able to recover the full partition successfully by running a file system check.

sudo fsck.ext4 -v /dev/sda10

I recorded the steps in this blog post. However note that the scenario is a bit different from the question.

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