How to enable AHCI mode when your Windows 7 is installed ready

1. Download AHCI driver

    For example, Using Intel chip-set, need to download
    1) ACHI driver for your OS and 64/32bit
    2) Intel RST utility.

2. Execute 'regedit' and change parameter "Start" to 0 in as follow resgiter

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci

3. Install AHCI driver under safe mode

    1) Reboot your PC, and enter safe mode
    2) Open device manager and IDE controller
    3) Update Controller driver by manual select, to focus to install AHCI driver for your chip-set.
    4) Reboot your PC

4. Install RST utility

    To install Intel RST. If find RST doesn't execute after installed, to check Inter RST on service manager.