[wazoo2u]

The DVD SHOULD be on the same IDE (secondary) channel as the CD recorder. What you don't want to do is pair an optical drive and a hard disk on the same IDE channel because the data transfer of the slowest device (the optical) becomes the speed of the bus, slowing your HD to crap. DMA or PIO mode won't be the cause of gaps. Saltman is correct that both DVD and CD drives should be set to DMA mode, but it's a seperate issue.