@ Arron milsom
Ultra DMA Mode 2 should be fine for 16x burning. UDMA2 is equivalent to 33MB/s. 16x burn speed needs 22MB/s. Some 16x drives, through their firmware, are able to be configured at UDMA4(66MB/s). It has to do with several system factors, including the cable, the firmware for the drive(s), the chipset etc. Windows configures this taking into account all the factors, and it will only set UDMA to the lowest common denominator. Currently, I don't know of any burners with UDMA5(100MB/s) capability. That is the realm of HDDs.