i bought a sony desktop viao last week which came with a DW-U12A dvd writer in it. when i ordered i was told it was the same as the 500AX. the specs say 4Xmax/2Xwrite/2Xread. i want to burn the 4X +R's, can i burn this media with this burner? do i need firmware? if i can't what is the fastest and cheapest +R media i can burn with this burner and where do i get it. i want a 100 spindle order. any help would be appreciated.