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Using TestDisk and fsck, I was able to restore the superblock from a backup and mount the clone of md1. I'm still validating the data against MD5 hash values I recorded. But so far, most of my data appears to be intact.

Thanks remy for your help.

Sorry for mistake in spelling... superbloc is the french word for superblock ;) I'm french and I knwo my english is awfull.

Take your time and let me know when you'll have results. Be careful to clone with bit to bit tool like dd, dcfldd or ddrescue (gnu ddrescue), else you'll copy only allocated ...

In a linux filesystem, there are groups of sectors with critical information about the filesystem. That is a superbloc. They are reproduced in multiple places on the disk. You have overwritten the beginnig of your filesystem, thus loosing the first superbloc, but testdisk, while scanning your disk ...

Wooops, forgot an answer :
As far as it was raid1 you can search on md0, sdb or sdc, you'll found same ext partition (if your raid was synchro)

Thanks. I'll give your suggestions a try as soon as I get the chance. But before I seek a professional data recovery service, I'd like to at least try ...

If this were happening on my Windows box, I have the tools and skills to at least determine if there's anything to recover and at most recover most if not all my data... Unfortunately, my experience with GNU/Linux is not as extensive and I'm pretty much at a loss as to what to do.

Here's what I ...