Windows 7 system starts AHCI to improve hard disk

Step 1: Press the Win button. Enter “regedit” in the Run bar and press Enter to open the Registry Editor.

Step 2: After opening the Registry Editor, go to the "HKEY_LOCAL_MACHINESystemCurrentControlSet ServicesMsahci" key. Double-click the item named "Start" in the right window, and a dialog box will pop up, changing the default parameter from 3 to 0. After clicking “OK", restart your computer.

Step 3: After restarting the computer, enter the BIOS, and in the “Integrated Peripherals” page, change “SATA RAID/AHCI Mode” to “AHCI”.
Save and restart, then the system will automatically install the AHCI driver. After installation, the system will ask to restart again. After the restart, the AHCI mode of the hard disk will be turned on.

Edit Comment: After the hard disk is changed to AHCI mode, the system startup speed does not change much. However, when copying large files, the speed was increased from the original 60MB/S to 71MB/S, and the performance was improved by about 20%. The hard drive has also improved in the system score in Windows 7.