Measure AHCI mode under Win7 to improve hard disk performance by 20%

I believe that when you use your computer, you pay more attention to the performance of the CPU and memory, but ignore the same critical hard drive. At present, the mainstream office system windows 7, requires higher accessories, and the performance of the hard disk has become one of the bottlenecks affecting the performance of the whole machine. Therefore, the hard disk naturally becomes an object that needs to be optimized, and by turning on the AHCI mode of the hard disk, the performance of the hard disk can be improved to some extent.
Under normal circumstances, the hard drive defaults to native IDE mode in the BIOS for best compatibility. If you install Windows 7 in this mode and then change the hard disk to AHCI mode in the BIOS, you will not be able to enter the system and you will need to reinstall the system. Is there a way to open the AHCI mode of the hard disk without reinstalling the system? Of course!
Tips: What is the AHCI mode of the hard disk?
AHCI is the abbreviation of Serial ATA Advanced Hosting Interface. A technology led by Intel that allows storage drivers to enable advanced SATA features such as native command queuing (NCQ) and hot plugging. After the AHCI is turned on, the potential performance of the SATA hard disk can be exploited, and theoretically, the hard disk read/write speed can be increased by about 30%.
STEP1: After clicking the boot menu, select the “Run” section of the menu. Type “regedit” in the input box of the run field and press Enter to open the Registry Editor.
STEP2: After opening the registry editor, enter the “HKEY_LOCAL_MACHINESystemCurrentControlSetServicesMsahci” key value. 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. Click “OK" and save and restart your computer.
STEP3: After restarting the computer, enter the BIOS and in the “Integrated Peripherals” page, change “SATA RAID/AHCI Mode” to “AHCI” (different BIOS option names will be nuanced).

Change "SATA RAID/AHCI Mode" to "AHCI" and save the reboot. After entering the system, the system will automatically install the AHCI driver. After installation, the system will ask to restart again. After rebooting, the AHCI mode of the hard disk will be turned on.
Measured effect: 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 60MB/S to 71MB/S, and the performance was improved by about 20%. The hard drive was also upgraded from 5.9 points to 6.5 points in the system score in Windwos 7. This shows that after the hard disk is turned on AHCI, the effect is good.