Enable AHCI with Vista already installed.

[kilroy67]

I ran across this yesterday, Ive initially setup this rig with AHCI (Advanced Host Controller Interface)disabled. So for a while I have been trying to figure out how to do it without doing a format, and then I came across this MS Support article:Error message when you start a Windows Vista-based computer after you change the SATA mode of the boot drive: "STOP 0x0000007B INACCESSABLE_BOOT_DEVICE". Well, its easier then I thought! Vista out of the box supports AHCI, so with a small tweak in the registry and a reboot to enable AHCI was all it took.