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

[jd1008]

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.