dvd-rw & cd-rw problems

My cd-rw & dvd-rw will not maintain enable recording by this device. When I go into properties for dvd-rw & enable record feature it will enable recording of that dvd-rw drive. Now the problem arises. When I enable recording by this device
for cd-rw the dvd-rw disables record feature. If I do the cd-rw first then the dvd-rw the cd-rw looses the ability to record. System.AMD-2400 , 256 megs of ram ddr, Samsung 16x dvd-rw,48x cd-rw, 60 gig hd