Enabling AHCI in Windows 7 WITHOUT re-installing/repair installing
AHCI stand for Advance Host Controller Interface. AHCI is a hardware mechanism that allows software to communicate with Serial ATA (SATA) devices (such as host bus adapters) that are designed to offer features not offered by Parallel ATA (PATA) controllers, such as hot-plugging and native command queuing (NCQ). The specification details a system memory structure for computer hardware vendors in order to transfer data between system memory and the device.
Chances are, most of you out there are not running AHCI as most boards have IDE mode by default. There are a few advantages with AHCI over native IDE mode, mainly for SSDs. This includes ability to use NCQ and Hot Plugging (HDDs). For SSDs, this will give you a bit more speed.
We have only tested this under Intel chipsets. I have NOT tested this with AMD/nVidia chipsets (and AFAIK, neither supports AHCI).
1. Open up regedit. (Windows Key + R > "regedit" ).
2. Navigate to HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > Msahci.
3. In the right pane, right-click "Start" (look under the Name column) and then click Modify.
4. In the Value data box, type "0" (this is a zero, not a "O" ), and then click OK.
5. Restart PC, go into BIOS and set it to "AHCI".
6. Windows should start and install the Microsoft AHCI drivers.
7. Reboot and then go online and download the latest chipset drivers for your chipset from the Intel website.
8. Install the drivers. Reboot once done.
9. Congrats! Now you have AHCI using the Intel drivers!
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