Won't Recognise DVD+RW

[zetor]

I have just bought a Plextor 504A and updated the firmware, burnt some DVD+RW's by , Ricoh, Ritek and Datawrite, all perfect but when I put in a 'Infiniti Professional' my drive says there is nothing in it and won't recognise it, anyway to get my Plextor to see it or is it just not compatable?
Zetor

[lafjax]

No help, but I've had the same problem. 708A with new Ritex 4X +RW's. I also upgraded the firmware to 1.06 but no improvement. It works fine with some old Phillips 2.4 +RW's that I've used for awhile.