I went to the Japanese website and D/L'ed the 1.04 firmware upgrade for the USB2 Plextor 24x. It upgraded fine and then my computer would not recognize my drive when I re-booted. I figured I would take a shot and re-install the drivers and it worked. I can't figure out why the firmware upgrade corrupted my drivers somehow and made me re-install them in order to see my drive but it did.
Well, now I have 1.04 firmware but I still can't copy SD2.51 with my drive no matter what.