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Can I enable AHCI after installing Windows 7 in a SATA drive that was on IDE mode?

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up vote 20 down vote accepted

According to Microsoft KB 922976, run Fix it 50470 or open regedit, navigate to one of these keys:

  • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\msahci
  • HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\IastorV

and set the value of the Start dword to 0.

using regedit to enable AHCI mode in Windows 7

Reboot and enable AHCI in BIOS, now it should work.

Remember to create a restore point before any changes, just in case.

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It only worked when I followed your procedure. – Jader Dias Feb 20 '10 at 2:36

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