I have bought my first laptop.
It is a HP DV1025LA, with 1.5 ghz P-M "Dothan" , 40 gb hd, dvd+-rw (NEC ND-6450A).
First, my laptop has a NEC dvd writer , model # ND-6450A.
I have heard that it can burn on Dual-Layer, but after looking in Infotool and in DVD Identifier, I can say that it doesn't burn on DL but it READS DL.
With this in mind, I wanted that my writer could burn on DL too, so I have flashed my laptop dvd writer with the help of binflash - NEC GUI version - (C) by Herrie, Liggy and r-man adn with the original (stock) firmware for the ND-6500A.
After restarting, Windows Xp , Nero and Nero Infotool recognize my dvd writer as a _NEC ND-6500A and reports that it can burn DL (See the attached Nero Infotool screenshots).
Conclusion: You can safely flash the ND-6500 firmware over the ND-6450 drive.
I hope this helps and happy DL burning