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Date: Mon, 13 May 2013 17:30:35 +0200
From: Vincent <vincent@influence-pc.fr>
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To: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Remove a materially failed device from a Btrfs "single-raid"
 using partitions
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Shit, I've followed the official documentation 
https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Replacing_failed_devices

With, as explain:
mkfs.btrfs -d single /dev/sda3 /dev/sdb1 /dev/sdc1 /dev/sdd1

mount -o degraded /dev/sda3 /media/single-raid/
btrfs device delete missing /media/single-raid/

And now all my datas on ALL drive has been deleted. How could I retrieve 
datas on my Btrfs formatted partition now?!