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Hi, you should be able to recover all of your data.
Wow...that's a confident statement! I wish I were as optimistic as you!
I would say he might be able to recover his data with some kind of DR tool providing the OS hasn't crapped all over the data with something else.
He should have probably pulled the plug the instant he realised that you ballsed-up, that there's no decent backups and you're only option might be some recovery tool.
Wow...that's a confident statement! I wish I were as optimistic as you!
Exactly my first thoughts.
Tools like dcfldd, ddrescue, dd_rescue, rdd-copy (find most of them on the HELIX Live CD) which features I described in short here, are tools used to get the data off the disk as much intact as possible (investigators would call that the acquisition phase), not for recovery in the sense of "undeleting". There's lots of threads at LQ about "undeleting" based on header / footer carving with tools like Photorec, Foremost, scalpel or other forensic tools. See for instance here, here and here. Because every situation is unique (read-writes between acquisition and recovery, journalling, on-disk filesystem structure leftovers, HW probs), I would always be careful and say no tool comes with a guarantee for recovery.
Distribution: Solaris 11.4, Oracle Linux, Mint, Debian/WSL
Posts: 9,789
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My understanding is dd_rhelp is meant to overcome bad disk sectors so has nothing to do with what the OP is looking for (file recovery).
Moreover, the OP wrote the file has been overwritten which likely mean, given the size involved (35 GB) the file data has been overwritten too. That will defeat all techniques the remaining tools mentioned are about.
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