suggestion 1: burn at a lower speed (i've already said this).
suggestion 2: play around with the IDE setup.
are both optical drives on the same IDE channel? if so, try placing them on separate channels (eg. Pioneer DVD-ROM as primary slave on the same channel as the hard drive, the Lite-On CDRW as secondary master).
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien