If the drive is a Memorex F16, it is a rebadged Lite-On SOHW-1633S. It can ONLY be cross-flashed up to a 1653S. Personally, I'd return the drive for a NEWER model. Given the fact that it was manufactured in March 2005, I would say it is either a 1673S or the new 1693S (the 1673S CAN be cross-flashed to the 1693S). Try a couple of burns, do a PI/PIF test and then make your decision.