Disappointed 2.4 rated DL won't burn at 4x

I have a 1620 with BP79 firmware and I just got two Ridata 2.4X DL blanks, I was hoping I’d be able to burn them at 4x, but alas Nero only recognizes them at 2.4X, oh well.


I think only the Verbatim/MKM DL discs can be oversped to 4x.

So far Benq only allow Mitsubishi (MKM 001) write at 4x.