Ldw 851s

ihave a ldw 851s drive an it keeps flashing from red to yellow while it is burning a dvd does anybody know what this means and how i can remedy it
thanks :confused:

Buffer underrun,
1.check dma is enabled
2.turn all non essential background apps off
3.dont touch the pc whilst burning
4.burn at a slower speed

how do i check the dma and its an 8 speed rewriter and i only burn at 4x and i take it there should be absolutly nothing on while im burning :iagree: