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Your Plexies should be connected on seperate ide channels as master,since your sata harddisk is connected to its own controller.
The Plextors should be running in UDMA mode 2.
If they still run in PIO after this setup,you can try to uninstall you Intel busmaster drivers and replace them by windows XP's native ones...
Lots of branded busmaster drivers cause problems with atapi devices...
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