I have 4 hard drives in this machine. 2 WD 250 Gig Special Edition(8 meg cache) and 2 Maxtor 160 Gig( 8meg cache). I have been having problems with simultaneous burns again and I narrowed it down to the hard drive not keeping up. I ran Sandra 2004 and none of my drives go higher than 7.9 meg a sec. They are all on their own channels as master. 2 onboard and 2 on Promise 133TX2 card.I swapped out the controller card with a silicon image 680 and still the same results. They are all in DMA 5 or 6. I'm stumped.They used to fly.I run O&O Defrag on these drives regularly and I just ran it yesterday. I also tried swapping out the round cables with standard 80 wire cables (flat).This sucks as this is what I do for a living and cant figure this out.