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Date: Fri, 11 Dec 2015 15:56:10 +0100
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From: =?UTF-8?Q?Lu=C3=ADs_de_Sousa?= <luis.a.de.sousa@gmail.com>
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Subject: Re: [dm-crypt] Fwd: Cannot wipe header on device
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To: Milan Broz <gmazyland@gmail.com>
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On 11 December 2015 at 15:34, Milan Broz <gmazyland@gmail.com> wrote:
>
> Could you please try to add to dd command: oflag=direct  and try it again?
>

Same result (see below). Thanks for helping in any case.

$ sudo dd if=/dev/zero of=/dev/sdb1 bs=4096 count=2500 conv=sync oflag=direct
2500+0 records in
2500+0 records out
10240000 bytes (10 MB) copied, 1.59072 s, 6.4 MB/s

$ sudo cryptsetup -y -v luksFormat /dev/sdb1

WARNING!
========
This will overwrite data on /dev/sdb1 irrevocably.

Are you sure? (Type uppercase yes): YES
Enter passphrase:
Verify passphrase:
Cannot wipe header on device /dev/sdb1.
Command failed with code 5: Cannot wipe header on device /dev/sdb1.