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Date: Sat, 5 Jan 2013 15:35:58 +0100
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Subject: Re: cleaning old entries
From: Jan Steffens <jan.steffens@gmail.com>
To: helmut@hullen.de
Cc: linux-btrfs@vger.kernel.org
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On Sat, Jan 5, 2013 at 3:12 PM, Helmut Hullen <Hullen@t-online.de> wrote:
> Has "mkfs.btrfs" to delete the "/dev/sdb" data when it overwrites the
> configuration with data for partitions? Or has the user to run something
> like "dd if=/dev/zero ..."?

Take a look at:
https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#How_to_clean_up_old_superblock_.3F