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

[Milan Broz <gmazyland@gmail.com>]

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