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Date: Fri, 11 Dec 2015 15:09:34 +0100
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Subject: [dm-crypt] Fwd:  Cannot wipe header on device
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On 10 December 2015 at 20:54, H McCurdy <hmccurdy@yahoo.com> wrote:
>
> The question is what happens if you try to write many zeros to the device=
.
> Does it work or does it throw an error?
>
> dd if=3D/dev/zero of=3D/dev/sdb1 bs=3D4096 count=3D2500 conv=3Dsync
>

Hello again,

The dd command goes on ok, but still the cryptsetup initialisation
fails - and with the same error (see below).

I start suspecting this is an issue with the hardware itself. Are
there other tests I could conduct?

Thank you,

Lu=C3=ADs


$ sudo dd if=3D/dev/zero of=3D/dev/sdb1 bs=3D4096 count=3D2500 conv=3Dsync
2500+0 records in
2500+0 records out
10240000 bytes (10 MB) copied, 0.579948 s, 17.7 MB/s

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

WARNING!
=3D=3D=3D=3D=3D=3D=3D=3D
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.