I’ve had my NEC 2500 for months now and have burned way too many DVD’s to count. The “HDD LED” stays on whenever the 2500’s “drive busy” LED is on. I don’t see that as a problem as it indicates that the IDE bus is busy - it’s not really only a HDD LED since the addition of CD/DVD drives. That bothered me at first, but I’ved learned to live with it. The other burners I’ve used didn’t do that (LG 4040, Plextor 504), but on the other hand they didn’t burn as reliably as this drive does.
This seems to be normal for this drive, so don’t worry about it.
BTW, I’m using it on an old AOpen AX6B (Intel chipset) P2 450 MHz system. It’s connected as slave to the secondary channel.
I hope this helps.
P.S. Some of the suggested “remedies” I’ve read (for a non-problem, may I add) scare me. Why? If the user is inexperienced, they could lead to more serious problems than having an LED that stays on.