From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gmazyland@gmail.com>
Received: from mail-wm0-x231.google.com (mail-wm0-x231.google.com
 [IPv6:2a00:1450:400c:c09::231])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by mail.server123.net (Postfix) with ESMTPS
 for <dm-crypt@saout.de>; Fri, 11 Dec 2015 15:34:36 +0100 (CET)
Received: by wmec201 with SMTP id c201so72729849wme.1
 for <dm-crypt@saout.de>; Fri, 11 Dec 2015 06:34:36 -0800 (PST)
References: <CAEtdG7uDuvJDys=TT9-Ou5zR8VMCFkqAiWJDLaR5dPhicDfVTA@mail.gmail.com>
 <1308232842.375292.1449777297163.JavaMail.yahoo@mail.yahoo.com>
 <CAEtdG7sSJQC79cAqCGcMwREH_nTb8NakiXSfCr3+vv3vyo0w+A@mail.gmail.com>
 <CAEtdG7vzPtjzcaD0O4Fa4QoHLApMiBo4vaWRL0x8H-9aCbr+KQ@mail.gmail.com>
From: Milan Broz <gmazyland@gmail.com>
Message-ID: <566ADEFA.7090509@gmail.com>
Date: Fri, 11 Dec 2015 15:34:34 +0100
MIME-Version: 1.0
In-Reply-To: <CAEtdG7vzPtjzcaD0O4Fa4QoHLApMiBo4vaWRL0x8H-9aCbr+KQ@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Subject: Re: [dm-crypt] Fwd: Cannot wipe header on device
List-Id: <dm-crypt.saout.de>
List-Unsubscribe: <http://www.saout.de/mailman/options/dm-crypt>,
 <mailto:dm-crypt-request@saout.de?subject=unsubscribe>
List-Archive: <http://www.saout.de/pipermail/dm-crypt/>
List-Post: <mailto:dm-crypt@saout.de>
List-Help: <mailto:dm-crypt-request@saout.de?subject=help>
List-Subscribe: <http://www.saout.de/mailman/listinfo/dm-crypt>,
 <mailto:dm-crypt-request@saout.de?subject=subscribe>
To: =?UTF-8?Q?Lu=c3=ads_de_Sousa?= <luis.a.de.sousa@gmail.com>, dm-crypt@saout.de

On 12/11/2015 03:09 PM, Luís de Sousa wrote:
> 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=/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

Could you please try to add to dd command: oflag=direct  and try it again?


Milan