[dm-crypt] Fwd: Cannot wipe header on device

Luís de Sousa luis.a.de.sousa at gmail.com
Fri Dec 11 15:09:34 CET 2015


On 10 December 2015 at 20:54, H McCurdy <hmccurdy at 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=/dev/zero of=/dev/sdb1 bs=4096 count=2500 conv=sync
>

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,

Luís


$ sudo dd if=/dev/zero of=/dev/sdb1 bs=4096 count=2500 conv=sync
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!
========
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.


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