There are two standard ways of accessing SATA controllers, via PCI IDE emulation or AHCI.. the "RAID" settings configured by some BIOS allow exposing a SATA controller in a native form, sometimes it's proprietary, sometimes it's AHCI with custom metadata on the disk on integraded chipsets.. OpenBSD -CURRENT refuses to attach in this case until softraid(4) can support such configurations.
Many BIOS's offer toggling a non-RAID AHCI mode, and it is often the default on systems sold with Windows 7.. older versions lacked an AHCI driver.
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