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

[John Pilkington]

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