How to open AHCI

for SATA hard disk The following content refers to Baidu: AHCI, the full name of Serial ATA Advanced Host Controller Interface (Serial ATA Advanced Host Interface /Advanced Host Controller Interface), which was jointly developed by several companies under the guidance of Intel. An interface standard that allows storage drivers to enable advanced Serial ATA features such as native command queuing and hot plugging. Its R&D team members include Intel, AMD, Dell, Marvell, Maxtor, Microsoft, Red Hat, Seagate, and StorageGear. And other famous companies.

AHCI is essentially a PCI-like device that acts as a generic interface between the system memory bus and the internal logic of the Serial ATA device (ie, it is common across different operating systems and hardware). This class of devices describes a generic system memory structure with control and status areas, command sequence entry tables; each command table entry contains SATA device programming information, and a description table (for data transfer on the device and host) pointer.
Simply put, when we enable the AHCI function, the management of the hard disk is transferred to the AHCI module and the driver for control. In this state, the NCQ and hot plug function can be turned on. The AHCI driver module is different from the normal IDE driver module. Therefore, if the system is already installed and changed in BiOS, it is basically impossible to enter the system. So if you are a new system user, you can see this page

First, we need to enable AHCI function in the BIOS. Select AHCI as shown above. Press F10 or another save shortcut to save BiOS and restart.

Take Vista as an example (also for Windows7). In the installation process, choose a new installation, then in the hard disk partition interface, select "Load Driver" Program", find the driver that was originally placed. If you install a 32-bit system, select the X86 folder. If you are installing a 64-bit system, select the X64 folder. Click OK to wait for the driver to install. After the installation is complete, the normal partition enters the system.

Special Note:

1: The above method is only applicable to the INTEL and AMD chipsets, and the motherboard of the NVIDIA chipset only needs to load a special driver in the system, so the NVIDIA chipset turns on AHCI. The method will be elaborated on the next page.

2: AMD chipset also needs to install AMD RAIDXpert, and enter RAIDXpert, account password defaults to admin, find "physical disk view", select the corresponding hard disk, select enable NCQ in the setting options , click to send it. Due to the difference in the driver module, just changing the options in BiOS, the operating system is unable to load the AHCI module and crash. So we have to make some changes in the operating system. The instructions below are for Vista and Windows 7. Note: The following steps are only available for the INTEL and AMD chipsets.

Vista and Win7 System 1: Type regedit command in "Run", find HKEY_LOCAL_MacHINE\\System\\CurrentControlSet\\Services\\Msahci, double-click "Start" in the "Name" column, in "Value Data" In the box, type "0", then confirm and quit the Registry Editor.

2: Then change the options in BiOS to AHCI and save as described above.
3: After entering the system, new hardware will appear. Users of the AMD chipset should manually select the AMD AHCI driver and install it. After installation, reboot, install AMD RAIDXpert, and enter AMD RAIDXpert, the account password defaults to admin, find the “physical disk view”, select the corresponding hard disk, select Enable NCQ in the setting options, click Send. Users of the INTEL chipset can manually install the Intel Matrix Storage Manager. AHCI function actual performance question and answer

Q: Can AHCI improve the speed of the hard disk?

Answer: AHCI is not a function that can increase the speed of the disk, so even if it is turned on, it may not be the read/write speed of the disk. Any advantage is seen in the test. As mentioned above, AHCI is more about optimizing the order of reading and writing, thus reducing the amount of time it takes to read a large number of files.

Q: Why did I open the AHCI and feel that the XP scroll bar has turned a few more turns?

Answer: After the AHCI is turned on, the system will wait for the time when the scroll bar is entered. a little longer. Because AHCI is loaded as a management module, it will be a bit slower than the normal IDE mode. But after entering the system, you can show your advantage.

Q: The above tips are for AMD and INTEL chipsets, so what about NVIDIA chipsets?

A: Most NVIDIA chipsets are not implemented in BiOS via BiOS, in the NVIDIA chipset. In the belt drive, there is an IDE SW driver that can be turned on by installing this driver.

Note:

Support but not open AHCI

Hard disk support for AHCI and open AHCI is a completely different concept. The hard disk supports AHCI, then after turning on HD TUNE, we can see that some options are ticked in "Supported Features".

Open AHCI

But after turning on AHCI, the supported feature options will become filled blue, which means that AHCI is actually turned on. In this state, The information and standards of the disk, as well as the health, are invisible.