The dual layer speed of NEC 3520 comparing to Pioneer 109 and Plextor 716 is limited to only to 4x. Both Pioneer and Plextor have promised a firmware upgrade to 6x for both -R/+R media, but I have seen no announcement from NEC. Is this correct?
I don't think there will be such upgrade from Nec, they only care about Oem. And maybe soon we will have a new burner from Nec, the 3530 with DL +R 8x.