In P8SCT BIOS Setup under Advanced Chipset Control, there is an AHCI option in the SATA Mode selection. Can you tell what this AHCI is?
ICH6 supports indenpendent DMA operation on 4 SATA ports. The SATA controller contains 2 modes of operation: a legacy mode using I/O space, and AHCI mode using memory space. Basically, AHCI offers better disk performance than Legacy SATA Mode, but a driver will be required if you set to AHCI.