Thursday, August 19, 2010

Windows 7 How to enable AHCI


Windows 7 will disable AHCI if it is disabled in BIOS when you install it.  If you try to enable it in BIOS you won't be able to boot.  Here's the solution:

  • Change your Sata controller mode in BIOS back to IDE and reboot
  • Open your registry editor (regedit) and search for the key "msahci"
  • Change the Start value from 3 to 0
  • Reboot
  • Go into your BIOS en enable AHCI
  • Save and reboot
When you reboot Windows 7 will update the driver for AHCI.  Once fully rebooted reboot again for good measure.  You should be good to go.

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