LTR12101B said:Well, if it's anything like the 401 -> 411 (Liteon) or 1100a -> 1300a (NEC), it may be a case of "possible, but results EXTREMELY variable".
If you can't get a GOOD burn, then it ain't worth messing around trying to force a 4x drive to do 8x (for PART of the burn, on SOME media), or to make a +R drives use -R badly.