Well, I adjusted my Saturn to use RW's, and it didn't take me long as all.
I adjusted the knob one way... untill it stopped reading any CD's.... so.. I uh, turned it the other way.. untill RW's spun up, it can read RW's fine now.. only took me about 15 mins to do.
Took me 3 1/2 hours to do it on my DC.. it is FARRR more picky, as there is a "sweet" spot you must find. >_<