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#1070
1) A BIOS set to ATA will handle IDE mode only.
2) A BIOS set to SATA will handle SATA mode only.
3) A BIOS set to Raid On will handle SATA mode & RAID mode, But not IDE mode.
Therefore leave your BIOS set to default Raid On.
When you do your Dual with Windows XP, load the Sata controller drivers at F6.