Windows 8.1 - How to Enable AHCI After Windows Installed

If for example you've upgraded your SATA HDD to a SSD and you notice poor performance that may happening because your BIOS it's configured to use IDE controller instead of AHCI.

It's not possible to just go to your BIOS and change to AHCI because that will result on a BSOD (Blue Screen of Death) when Windows startup.

So, follow this steps to do it properly:

1. Open a command-prompt as Administrator


2. Run the following command:
   bcdedit /set {current} safeboot minimal


3. Reboot the machine, enter the BIOS and change the controller to AHCI


4. Now Windows will startup in safe mode


5. Again, open a command-prompt as Administrator


6. Run the following command:
   bcdedit /deletevalue {current} safeboot


7. Reboot again


8. You're Done!

Hope this help you get the most of your SSD!