Drive Controller Info for Windows and how to enable AHCI

Want the best performance from your HDD or SSD?

Note:  There is always a risk when you change settings – backup your data before doing this

  • Enter your BIOS
    • Is AHCI enabled on the HDD or SSD?
      • Yes?  Then you are probably ok.  Check your Device Manager and make sure you see AHCI on your controllers.
    • No, but AHCI is available and you have Windows 7 installed?  Do not change to AHCI until you boot normally into Windows and edit the registry
      • Exit all Windows-based programs
      • Click Start, type regedit in the start search box, and then press ENTER
      • Navigate to HKEY_LOCAL_MACHINE / SYSTEM / CurrentControlset / Services
      • Open msahci  –  click on “start” and go to Modify -in the value Data field enter “0” then click “ok” – Exit “Regedit”
      • Reboot your computer and enter the BIOS – Change the setting to AHCI – save the changes and boot into Windows
        • Your computer will enter Windows and recognize the new settings and reboot once more
        • Your computer will now be faster using AHCI

What if you have Windows 8.1 and AHCI is available in the BIOS but not configured?

  • Open the command prompt as an Administrator
  • Type bcdedit /set {current} safeboot
  • Reboot and enter the BIOS
  • Change to AHCI – save and exit
  • Windows will boot into Safe Mode
  • Open the command prompt as an Administrator
  • Type bcdedit /deletevalue {current} safeboot
  • Reboot

Your drive controller will now be AHCI  (Check the Device Manager)

Have a SSD?  Don’t forget to enable TRIM

Open a command prompt and type-
fsutil behavior set disabledeletenotify 0

Here’s a great little program to exam your controllers –

Drive Controller info


About TCAT Shelbyville IT Department

The Tennessee College of Applied Technology - is one of 46 institutions in the Tennessee Board of Regents System, the seventh largest system of higher education in the nation. This system comprises six universities, fourteen community colleges, and twenty-six Applied Technology Colleges.
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