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I have AHCI enabled in Windows 7 through HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci.

My Asus motherboard comes with a drivers software including AHCI drivers. I used their setup program and I assume it installed the AHCI driver.

I did a search in the whole Windows folder and don't see a file with ahci in the same other than msahci.sys

How do I know which ahci driver Windows is using and how do I switch to the Asus one instead of the one from Microsoft? Is Device manager used?

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Go to your device manager (Right-click Computer, Manage, then Device Manager) and under IDE ATA/ATAPI-Controllers, right click one of the entries and then click the driver tab. This will show you what drivers are being used.

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I don't see it in any of the entries. Does it get loaded only when the BIOS is set to AHCI even if its enabled in the registry? – Tony_Henrich Oct 12 '10 at 23:05
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