uncleflo
Registered since September 28th, 2017
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filesystems - recovering ext4 partition after dd'ing over start of HD - Unix & Linux Stack Exchange
Saved by uncleflo on August 9th, 2014.
I accidentally used dd and wrote over the first 208MB of my external disk. What I wrote over is a partition on its own (Debian nestinstaller) so what I see now is not my old (now damaged) ext4 partition but another smaller partition. This limits the tools and advices I could follow. My plan was to recreate the partition table with testdisk and then fix everything with the backup superblocks as described here. I'd lose the first 208MB but that's ok compared to the other 300GB of data in there. Something like the following:
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How to recover ext4 from GPT partitioned disk - Information Technology
Saved by uncleflo on August 9th, 2014.
Hard drive sizes had increased dramatically in last several years, but block device drivers are still outdated. For hard drives more than 1TB currently seems to be an advantage to use GPT instead of legacy MBR partition table. You can see more details at http://en.wikipedia.org/wiki/GUID_Partition_Table. One of the inevitable disadvantage of GPT is the possibility of corruption by using outdated partition editor like cfdisk, or other disk tools, even without any intention to modify the partition. It happened recently on one 1.5TB WD Caviar Green with GPT and one ext4 partition full of data.
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HOWTO: Repair a broken Ext4 Superblock in Ubuntu « Linux Expresso
Saved by uncleflo on August 9th, 2014.
This has happened to me a few times, and it’s not a nice problem to find yourself in. You computer won’t boot, all your filesystem checks tell you you’ve a bad superblock, but you cant seem to find how to fix it. Well, here goes :) This guide is for ext4 , though I’ll explain how other filesystems can be cured along the way. The easiest way to carry all this out, seeing as your computer probably won’t boot at this stage, is to download and burn a copy of Parted Magic. Boot from that, and you’ll access to a number of useful tools.
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