Hi. Can anyone explain the combination instuction, and is found in the CMOS. This seems quite a technical mode setting. Has anyone used this setting for their system. SATA Operation Determines the integrated SATA controller's operating mode: RAID Autodetect/ AHCI (the default setting) – RAID if the drives are signed, otherwise AHCI RAID Autodetect/ ATA – RAID if the drives are signed, otherwise ATA RAID On – SATA is configured for RAID on every boot. Combination – combination mode, which offers compatibility with versions of the operating system that do not support SATA drives.