Verbatim DVD-R don't burn at 4x speed

Hi folks

I’ve just bought some Verbatim 4x certified DVD-R. I have a NEC ND 1300A which should be able to burn at 4x speed, but it only burns at 2.3x. I applied that Nero registry trick to see the real burning speed and it displays “Writing at 2.3x”. This also seems to conform with the fact, that burning a complete dvd-r takes about ~21 minutes. In the nero burning dialog where you can choose burning speed I was even able to select 4x.
Any ideas about this issue?

Thx in advance


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Im sorry. Thank you very much anyway.