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

[jd1008]

On 04/01/2015 07:15 PM, g wrote:
>
> On 04/01/2015 02:18 PM, 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?
> 1- burn dvd at 2 speeds lower than what you used and had failure.
This has been my method always at 2X speed.
>
> if ok, problem is either burner or blanks.
It turned out to be the blanks. My eyes are not what they used
to be. When I examined the outer edges I notices the strange
manufacturing blemishes that became apparent under the direct
sunlight.

Thanks.