If your DVD-RW is running in UDMA mode, I would swap it with your CD-RW to see if that helps. Or, you could put both hard drives on the primary and your optical drives on the secondary channel.
I have my system set up this way (2 Seagate HDD's running UDMA mode 5; Plextor CD-RW and Pioneer DVD-ROM on IDE 2 running UDMA mode 2) and it's worked really well.
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