I've been trying at this for a few weeks now... mostly lurking on these boards, or googling, trying to find as much info as i can, but i have gotten nowhere, so now i post to see if anyone is either in the same boat, or can help me.
Basically, i got an ND 6450 out of the box in my Compaq R3440CA laptop. I learned soon after that this was a 6500, and so capable of burning DL, just with depreciated firmware. So, i hunted down some firmware for the 6500(2.23), and flashed it. All went well until i tried burning DL. I bought myself Verbatim DL disks, that i had read are amongst the best, and made sure that they do actually work on the ND6500(darn things ain't cheap!!).
Anyhoo, to cut to the chase, It didn't work. So, since then, i've tried every firmware i can get my hands on, including modified versions. I'm still at the same place i was... I know the thing still works fine, since i can burn cd's and dvd5's without a problem, it's just this DL issue.
Nero tell's me it's an illegal disc, Sonic recordnow just flakes out on me, and DVD Decrypter tells me that it's an incompatible format. I haven't tried a different medium mainly because i haven't heard one person say that they have had problems with the Verbatim DL's on this drive, only statements that it does actually work. Other things i've tried are updating Nero to the latest version(188.8.131.52), and all the other burning software i have to latest versions, and updating my BIOS to the latest version i could find(given that this is a laptop)
Anyhoo, if anyone can give me a hand, that would be most appreciated.. I can get you any logs you may want, just ask.