"So if you are setting up a new system with AHCI-capable controllers, DO NOT enable it until you have Windows installed and then your motherboard chipset drivers for AHCI installed. Trying to jump the gun and be too advanced for the situation caused me a two-hour delay in setting up this machine, due to the inexplicable hang. Keep it simple, add the fancy stuff later, AFTER the drivers are installed."
I say install windows, then drivers and then turn on AHCI.
But I'm cautious when it comes to data.