Changing the SATA mode after installing an OS will cause a blue screen (BSOD) or boot failure (INACCESSIBLE_BOOT_DEVICE). Windows installs a different driver for IDE vs. AHCI/RAID.
Here's a general text about SATA controller BIOS: sata controller bios
If you want to add or modify anything, feel free to ask! Changing the SATA mode after installing an OS