Win7 starts AHCI to improve hard disk performance What is the AHCI mode of the hard disk?

In today's computer
system, the performance of the hard disk has become the biggest bottleneck affecting the performance of the whole machine. In the Windows
7 system, which has high requirements on accessories, the hard disk naturally becomes an object 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. Then look at the small series of win7 to open AHCI how to achieve it

Under normal circumstances, the hard disk defaults to the native IDE mode in the BIOS to get the 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!

Foreword: What is the AHCI mode of the hard disk?

AHCI is the acronym for 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. pull. After opening AHCI, you can take advantage of the potential performance of SATA hard drives. In theory, you can increase the read and write speed of hard drives by about 30%.

First: 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.

Second: After opening the Registry Editor, go to the “HKEY_LOCAL_MACHINESystemCurrentControlSetServicesMsahci” 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. Click “OK" and save and restart your computer.

Change “Start”Default Parameters

Third: After restarting the computer, enter the BIOS, in the “Integrated Peripherals” page, “SATA RAID/AHCI Mode” Change to  quo;AHCI" (different BIOS option names have nuances).

Change "SATA RAID/AHCI Mode" to "AHCI";

Save and restart, the system will automatically install the AHCI driver after entering the system. After installation, the system will ask to restart again. After the restart, the AHCI mode of the hard disk will be turned on.

hard score raised to 6.5, performance improvement of about 20%

Written in the last: After a hard disk to AHCI mode, system boot speed does not change Big. 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's system score in Windwos7 also increased from 5.9 points to 6.5 points. This shows that after win7 started AHCI, the effect is good.