to ENABLE AHCI
Highlight HKEY_LOCAL_MACHINE, File>Load Hive>[restored volume]:\Windows\System32\Config\SYSTEM>Open>Key Name = otherdrive_HKLM>OK.
Expand otherdrive_HKLM\ControlSet001\services and ensure the following are set:
Start Type:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\msahci
from "3" to "0"
If you need IDE,
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\pciide
from "3" to "0"
This also works to switch a system from IDE to AHCI in place, just edit the above items in currentcontrolset of a running machine except make ide "3" then reboot and set ahci mode in bios Also if was nvidia chipset, nvstor set to start 3
Referecnce webpage: https://www.sevenforums.com/hardware-devices/165671-enable-disable-ahci.html