My 3500 unit wont lock for burning

Ive looked everywhere but I cant find the reason why when using my NEC 3500 and dvd shrink/decryptor, that it gives me the error message " cant lock unit for exclusive access" when I put in a blank dvd for burning.
I can hit “ignore” but I dont know if it still makes a good burn or not. And it doesnt happen 100% of the time. Anyone know why?

See if this post helps:

thanks it does help, I didnt know if locking affected the writing or not.

Mine just started doing the same thing, but it happens all the time. I read the article, but I had already done that. Nero gives me an internal error when I try to burn.