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View Full Version : How to enable AHCI in Vista after the OS was installed using IDE mode


Fangs404
06-30-08, 03:45 PM
I wanted to try AHCI out because I have all SATA drives, and I figured I might see some sort of performance increase. However, when I enabled it in the BIOS, I encountered the famous blue screen upon reboot. I Googled and Googled until I finally found a very simple fix that allows it, courtesy MS. I figured I'd share because I searched here, and it seemed that a lot of people have had the same issue I experienced.

http://support.microsoft.com/kb/922976

1. Exit all Windows-based programs.
2. Click Start, type regedit in the Start Search box, and then press ENTER.
3. If you receive the User Account Control dialog box, click Continue.
4. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\Msahci
5. In the right pane, right-click Start in the Name column, and then click Modify.
6. In the Value data box, type 0, and then click OK.
7. On the File menu, click Exit to close Registry Editor.

That's it! Make that registry change, reboot, go into the BIOS, enable AHCI, and then you're golden. Don't forget to get the latest chipset drivers!

tunnel
07-01-08, 04:11 AM
I noticed i had AHCI and RAID on my BIOS.

Would somebody please be so kind to explain what AHCI is?

Jon
07-01-08, 07:32 AM
I noticed i had AHCI and RAID on my BIOS.

Would somebody please be so kind to explain what AHCI is?

AHCI is more or less an enhanced IDE mode. It offers additional features specific to SATA - most commonly hot-plugging and NCQ.

AHCI=Advanced Host Controller Interface.