Dead drive...heh, you must be joking.
And yes, I still remember all your posts and all the problems, but not that many of your problems have been (BenQ) drive related IMO.
Just the idea about trying erase a 4x CD-RW with a fast 16x DVDRW drive makes me think there are "other more severe problems" then your drive...
I use my 5y old HP 9100 CD-RW for tasks like that you are up to.
To my knowledge 4x CD-RWÂ´s are not compatible with your BenQ. Get at least 10x CD-RW media.