linux-ext4 - restoring ext3 filesystem overwritten by ext4

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Date:	Sat, 21 Jul 2012 20:49:07 +1200
From:	David Hayes <davemellow@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: restoring ext3 filesystem overwritten by ext4

This is a general question about whether it should be possible to
effectively undo a mkfs.ext4 on a partition which previously held an
ext3 filesystem. I'm just a user, not a developer, so I'm not familiar
with the details of where backup superblocks get written etc. I had no
luck finding any old filesystem information with testdisk, so I'm
wondering whether ext4 might overwrite all the superblocks by
coincidence of choosing the same blocks in the partition to write them
as mkfs.ext3 did, or something.

If the answer to the above is "yes" I'll respond with more specific
details if required.

Thanks,
David.
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