Ahci Where to look for in Bios. What is AHCI mode and how to configure it? How to activate the SATA AHCI interface mode on a computer with already installed Windows

Technology ADVANCED HOST CONTROLLER INTERFACE (AHCI) - This is the standard proposed by Intel, which allows you to increase the speed of performing read / write operations with hard disksconnected via SATA protocol by using advanced SATA technology, such as integrated command sequence (NCQ), in addition, the standard supports hard disk hot swap technology (Hot Swap). In Windows 7 operating systems and Windows Vista. already have the ability to support AHCI, and in the event that during windows installations 7 The system detects that the computer supports AHCI, the AHCI driver is automatically installed.

In old models motherboardsDespite the fact that the chipset supports AHCI technology, its support is disconnected at the BIOS level. Therefore, if when installing Windows 7 / Vista, the installer has not defined the presence of support for ACHI on the chipset, then the AHCI device driver will not be installed. As a result, if in such a system after installing Windows, activate the support of ACHI in the BIOS, then the system can stop loading or will fall in blue screen Bsod.

Therefore, if after installing Windows 7, you found that your motherboard supports AHCI mode, but this feature is disabled to the BIOS, then this instruction It will help you to activate AHCPI support in Windows 7 / Vista.

Attention! This sequence of actions must be performed before activating AHCI in bIOS settingsOtherwise, the system will stop loading!

How to check whetherAhci B.Windows

If you are not sure if you are enabled or no AHCI support in your Windows 7, then following this instruction, you can set this fact.

  1. Open the Device Manager (in the Start menu type Device.Manager.).
  2. On the UAC query that appears "Do You Want to Allow The Following Program to Make Changes to this Computer?" Answer Yes.
  3. Open the section IDE ATA / ATAPI Controllers .
  4. If the AHCI driver is installed in Windows, something like something like Standard AHCI 1.0 Serial Ata Controller or Intel (R) 5 Series 6 PORT SATA AHCI CONTROLLER.

In the event that there is nothing about Ahci Controller, you cannot find, it should be assumed that the support of AHCI on your system is disabled. And you can activate AHCI in Windows (according to the above instruction), and then turn on the AHCI in the BIOS.


If you contact the system administrator and ask a question, what is the weakest link in the computer? - You will receive an answer that it is the HDD, because it is almost the only mechanical element of the system that slows down the work of the entire computer. In this regard, many manufacturers were looking for a way out, at least some possibility to speed it up, also with SSD. The yield was visible when using AHCI.

The AHCI disk mode includes several main differences (therefore 3), which make it a priority to use all disk drivesexcept obsolete IDE. The main "chips" of the regime:

  • Hot Plug - Allows you to "hot" computer components (discs). Thus, there is no need to shut down and de-energize the PC, you can change the HDD, SSD in the operating mode. This is important for server stations, where the disconnection is unacceptable and simply convenient for anyone who uses several disks;
  • NCQ - support for "deep" team sizes, that is, it is capable of setting up a more efficient trajectory of the head movement in mechanical and significantly increases returns to SSD;

  • Trim - primarily applicable to SSD, as it guarantees a significant increase in speed.

AHCI allows you to enjoy all these advantages and, most likely, you have the ability to enable it. If you are using SSD, then you will probably need to include it to see the proper speed of its operation, applies to both SATA II and SATA III, except for outdated IDE discs. Therefore, if you doubt what kind of IDE or AHCI mode, is definitely the latest advantage.

How to check whether AHCI mode is on?

It is paramount to know whether it is worthwhile to take further switching, perhaps it is already active. There are several places that show necessary information: Device Manager and BIOS.

  • Click Start, where the PCM software on "Computer" and click on "Properties";
  • Now select "Device Manager";

  • Next, expand the "IDE ATA / ATAPI Controllers" section;
  • Check if there is no partition called AHCI.

In the absence of such an item, you can find out what it is inactive. Also consider another option via BIOS (UEFI):

  • Go to the BIOS by clicking Del or F2 (other keys maybe) when you start a computer;
  • You should go to the SATA or Storage title in different versions until you find SATA MODE / CONFIGURATION, where the mode will be shown.

At this stage, do not change the connection mode, as it is fraught with system errors. It is best to enable AHCI mode in the BIOS and install new WindowsWhat guarantees normal mode processing, but it is rather radical.

How to enable AHCI mode in Windows 7?

The most relevant and common system in which we will perform actions. It should also be noted that if you install new DiscYou can freely switch the AHCI mode without any consequences. There are also several AHCI activation options: through the registry and through the utility. A more correct option will be through the registry to prepare the system for further changes, the last method will simply help solve the urgent errors in the computer.

  • Press Win + R and enter the REGEDIT;
  • Proceed HKEY_LOCAL_MACHINE \\ SYSTEM \\ CURRENTCONTROLSET \\ SERVICES \\ MSAHCI;
  • Replace the value of the START option to 0;

  • Locate the Lastorv section here;
  • Also replace START to 0.

Now you can enable AHCI mode in BIOS and Windows correctly define it by installing the necessary drivers. Alternative way Includes the initial change of mode, and then simply eliminating the error. To do this, use the official utility. Microsoft Fix IT. After installation, start checking and fails will be eliminated, you may need to be performed from a secure mode.

How to enable AHCI Windows 10 mode?

In general, the actions are not significantly different, consider differences in editing the registry.

  • In the same section, as in Windows 7, you need to change the START parameters in the IASTORV and STORAHCI folders to 0;
  • Expand each of the specified sections and go to the StartOverride subsections, where the parameter 0, set the value 0.

We managed to turn on the AHCI Windows mode, but it is worth noting that it is better to first run into safe modeIn order to avoid unnecessary problems. In the process of primary inclusion, the AHCI mode will install required drivers automatically.

The distinctive features should be related, how to enable AHCI mode in Windows XP and other outdated versions.

Despite the fact that in XP support for this regime is not at all, there are drivers that expand these opportunities, although it is not safe.

You should also think about whether it is worth it, because if the computer is very weak for more modern Systems, the speed increase will be insignificant. Also, the AHCI controller mode in Vista is included in similarly "seven".

So, the AHCI SATA mode is easy to turn on, and the system will reward you for the growth of speed. Usually no problems with changing the controller does not occur, but if you encounter them, just run the Microsoft Fix IT utility. AHCI is required to use when using an SSD disk, otherwise you will not use its speed to full.

If you have any questions about "What is AHCI mode and how to configure it?", You can ask them in the comments.


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ADVANCED HOST CONTROLLER INTERFACE (Ahci.) - The mechanism used to connect information drives using the Serial ATA protocol, which allows you to use advanced features such as the built-in command order (NCQ) and hot replacement.

It is intended to replace an outdated classic ATA controller that supports compatibility from top to bottom with the original IBM PC / AT, and supports direct memory access only as an addition. The main real problems of this controller are the lack of hot replace support (despite the fact that ESATA supports it) and command queues, on one channel (in the case of SATA, each device has one channel) - Only one command can be played simultaneously. Thus, the use of the possibility of ATA NCQ, even with the support of it by the disk itself, is impossible on the classic ATA controller.

When switching, with the already installed Windows, the ATA controller, which is part of southern BridgeIn the "AHCI" mode, this will mean, for the installed operating system, the involvement of an incompatible logic of the LGD controller is equivalent to the installation of the ATA controller board, different from the existing and physical switching of the boot disk on this fee.

In this case, Windows does not find boot disk and emergency stop with bsod STOP 0x0000007B, incaccessible_Boot_Device.

The text is taken from the free encyclopedia http://wikipedia.org/

So, since you came to my site, it means that we have appeared a common problemwhich you have appeared after buying a new SSD (for example in WH .RU). And reading the text above, you could understand her root. For some reason, Microsoft still cannot make a free transition from one driver to another. And to do this, users have to work a little, but in principle quite a bit. To solve the problem, it is necessary before switching to the BIOS to install the AHCI driver in Windows, or rather, make a small amendment in the registry. This is an instruction for Windows 7 operating systems, Windows Vista and Windows Server 2008 R2. For Windows 8, the instruction is a bit different and available on the link:

I. Manual switching Windows 7 to AHCI mode

1) go to the registry. To do this, use Win + R and in the window that opens, we write regedit.:

2) A built-in "Registry Editor" will open. On the left side of the window we go along the way:

HKEY_LOCAL_MACHINE \\ SYSTEM \\ CURRENTCONTROLSET \\ SERVICES \\ MSAHCI


3) Double-click Open the parameter Start. and change the value to 0 (default is the value " 3 "- AHCI is not supported):

4) That's all, we close the registry and reboot the computer.

5) During the boot, go to the BIOS and enable AHCI support. How to do this can be read in the instruction manual for your motherboard. Save the settings and restart the computer.

After windows startup The AHCI driver itself will install and restarts again. After restarting hard drives Will work already in the AHCI standard.

II. Automatic Fix to prepare Microsoft Windows to the transition to AHCI or RAID mode

Finally, Misrosoft has come on the 21st century and they released an automatic fix, to prepare the system to switch to AHCI or RAID mode. Now everything you need to do is download a small utility from the official site, run it, then restart into the computer to enter the BIOS and set the necessary mode (AHCI or RAID) there. The system after that will start without any problems and install all the necessary drivers. Charm :) Thanks Microsoft, now learn how to add this fix to the installation image of the system. (More information about this fix can be read on the page http://support.microsoft.com/kb/922976).

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Thanks for attention:)

To enhance the speed of hard drives and SSDs use special. There are many in it useful features, such as, hot turning off and connecting disks, NCQ and more. In the previous article, we considered, in the Windows 10 operating system, a way to enable through the registry is considered.

If you only reinstall the system, and you have an IDE mode in BIOS, it is recommended to rearrange it on AHCI. In modern laptops and computers, this mode is usually enabled by default, if you use, the use of AHCI is only plus.

The beginners should be taken seriously when using this manual, since unnecessary actions and inattention can lead to non-system launch. You must be able to use Bios and UEFI and be able to correct the problems that have arisen in your fault.

Before starting the process, it is necessary to know whether AHCI mode is enabled, maybe this article is not needed now. You can see in BIOS or from Windows.

Go to the Device Manager (you can go if you click right-click on the Start menu) and open the tab "IDE ATA / ATAPI controllers"If there is a AHCI word, then the mode is enabled if IDE, then this mode and is used.

So, if AHCI is not active, then proceed to its inclusion.

How to enable AHCI on Windows 10 through the registry?

Run, for this, press the hot keys Win + R and enter the command regedit. .

As in the previous article we need to go to the IASTORV section: HKEY_LOCAL_MACHINE \\ SYSTEM \\ CURRENTCONTROLSET \\ SERVICES \\ IASTORV. On the right side of the window, find the START parameter and click on it twice. Change the value to 0, click OK.


In the Services section, find the section iASTORAV Open it, there must be a section StartOverride. Find the parameter 0 to the right, click on it twice and change the value to 0.


We are looking for in the section Services. section storahci.in which the value of the START parameter is changed by 0.


Finishing touch. The Storahci section must have a section StartOverride, Parameter value 0 We change to 0.


You can close the registry editor. Restart the computer and log in to the BIOS. Better, of course, spend. This can be done if you open the "Run" window and enter the command msconfig where you go to the "Load" tab and put the "Safe Mode" checkbox.


When you go to the BIOS you need to find the SATA parameters and select AHCI mode there.

Once you save the changes and exit the bios, the installation of the drivers will begin. The computer needs to restart again.

Advanced Host Controller Interface (AHCI) technology is a standard that Intel has offered, it allows you to increase the read / write speed for hard drives connected to the computer via the SATA interface. If your computer installed modern hDD (SSD, for example or a regular HDD SATA), and the motherboard supports AHCI mode - perhaps you visited the thought, how to increase the performance of your PC.

Windows Vista / 7/8 / 8.1 operating systems already have built-in support for AHCI standard, so if during Windows installation, it will be found that the computer supports AHCI, the AHCI driver will be installed automatically. Windows XP does not have built-in support for this standard, but it is possible to make friends, look for the material on this topic separately. In the old models of motherboards with support for AHCI at the chipset level, the AHCI mode is disabled at the BIOS level. But how to be in a situation where the operating windows system 7 already installed? I think many who collided with this problem know that replacing in BIOS mode IDE on AHCI, Windows simply does not start. And you will most likely get a BSOD (blue screen of death). An option that suggests itself is to change the mode with IDE mode on AHCI, then reinstall Windows. BUT! In this case, you lose all data on a C disk, which may be painful if there are many applications there and the valuable information is stored. Below is described how to switch to AHCI mode without reinstalling the system and data loss on Windows 7. For users. Remember, all the actions you perform at your own risk and risk, and no one except you permeasibility.

Attention! The following sequence of actions must be performed before switching on the AHCI mode in the BIOS settings. Otherwise, the system will stop loading!

1. Press the Win + R keys combination, and in the window that opens, type the command regedit.To open the registry editor. To whom it is difficult, you can dial regedit right in the Start menu panel.

2. To "Allow the following program to make changes on this computer?" We answer "yes."
3. In the registry editor, go to the desired branch: HKEY_LOCAL_MACHINE \\ SYSTEM \\ CURRENTCONTROLSET \\ SERVICES \\ MSAHCI
4. Find the parameter in the right pane. Start. And edit it ( Change)


5. Set the parameter " Start."Value 0 , and press OK.. The default value (AHCI support is disabled): 3 .

6. Close the registry editor.
7. Restart the computer.
8. During the restart of the computer, enter menu Bios. and enable AHCI support. Press the F10 key, save the changes and restart the computer again.
9. After downloading, Windows 7 will automatically install the AHCI devices drivers. After the end of their installation, Windows will restart another time. 10. That's all! After windows downloads Hard drives will support the AHCI standard, and accordingly work faster. Visual increase in productivity is a very subjective moment! Yes, your computer will become faster, but besides hard disk There is still much more on the computer, because of which it can slow down, so it is possible that the explicit speed of speed you will not see.

That's all. Thank you for reading an article. I hope she was helpful to you.