question about burning and then reading (dd) to confirm sha256sum

[John Pilkington]

On 02/04/15 18:13, jd1008 wrote:
>
>
> On 04/02/2015 02:56 AM, John Pilkington wrote:
>> On 01/04/15 20:18, jd1008 wrote:
>>> After burning 3 DVD's, and reading them back to compute sha256sum.
>>> all three of them generated these error messages during readback,
>>> and all 3 messages show the error was past the 4gb offset.
>>>
>>> Is this a media issue or is it the burner?
>>>
>>
>> I burn DVDs from iso images using the k3b verify option, but I don't
>> think you can separate the two parts.
>>
>> After iso creation and before burning I use implantisomd5; checkisomd5
>> then does what it says.
>>
>> For explanation see:
>>
>> http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/
>>
>> HTH
>>
>> John P
>>
> Problem with k3b is that it refuses to force 2X speed.

Do you *want* a slow burn?  I rarely have problems at 8x.  Verbatim 
DVD+R rated at 16x.  But obviously many other factors can cause problems 
too. And I'm using SL7, el7 near-clone, which is rare here, IIRC.

John

>