The Advanced Host Controller Interface (AHCI) is a technical standard by Intel that can speed up hard disk read/write operations by making available SATA’s advanced capabilities such as hot swapping and native command queuing to the host system. Windows 7 and Windows Vista can natively support AHCI, and the AHCI driver is installed and used by default if Windows 7 detects that the computer supports AHCI during installation.
Some older computer disables AHCI support at BIOS level, even though the motherboard’s chipsets support AHCI. Without AHCI, a computer runs even slower when the slow computer supposedly have a little boost with AHCI turned on.
Windows 7 and Windows Vista does not install AHCI device driver if it does not detect presence of ACHI support on the system during installation. As the result, if you enable the ACHI in BIOS after Windows is installed, the system may crash and unbootable.
If you have just notice that your motherboard does indeed support AHCI after you have installed Windows 7 or Windows Vista, but have previously been disabled, here’s the trick the enable AHCPI support in Windows OS. The step has to be done BEFORE AHCI is turned on in BIOS to avoid any system crash.
Type RegEdit into Start Search and hit Enter to start Registry Editor.If the UAC dialog box prompts and asks “Do you want to allow the following program to make changes to this computer?”, click Yes button.In Registry Editor, navigate to the following registry key:HKEY_LOCAL_MACHINE
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