Asus Crosshair V Formula/ThunderBolt - Manual (Page 102)

3-18 Chapter 3: BIOS setup
3.5.3 SATA Configuration
While entering Setup, the BIOS automatically detects the presence of SATA devices.
The SATA Port items show Not.Present if no SATA device is installed to the
corresponding SATA port.
Onchip.SATA.Channel.[Enabled]
Configuration options: [Disabled] [Disabled]
SATA.Port1-Port4.[AHCI]
Allows you to set the SATA configuration. This item appears only when you set the
OnChip SATA Channel item to [Enabled].
[IDE]
Set to [IDE] when you want to use the Serial ATA hard disk drives as
Parallel ATA physical storage devices.
[RAID] Set to [RAID] when you want to create a RAID configuration from the
SATA hard disk drives.
[AHCI] Set to [AHCI] when you want the SATA hard disk drives to use the
AHCI (Advanced Host Controller Interface). The AHCI allows the
onboard storage driver to enable advanced Serial ATA features that
increases storage performance on random workloads by allowing the
drive to internally optimize the order of commands.