How to install ahci in bios. Hard drive operating modes: AHCI vs IDE


One of the main elements of any computer device, as you know, is HDD on which information is stored. In relation to hard drives of any type, the term AHCI is used. But many users not only know how to enable AHCI, but have no idea what it is. Let's consider the meaning of the main term and the actions required to activate this mode on Windows systems.

What is AHCI?

Modern hard disks, connected to the motherboard via can use two modes: IDE (compatibility with legacy equipment) and AHCI - latest standard, designated as Advanced Host Controller Interface, which allows you to greatly increase the performance of the device itself and the installed operating system due to faster data reading.

Almost all modern SSD drives show an increase in performance when accessing them precisely when the AHCI mode is set. But this is not the most important thing.

What is AHCI mode for?

Let's leave for now the question of how to enable AHCI mode in Windows, and let's look at the benefits that a user of a modern computer can derive from activating this mode.

First of all, when AHCI mode is activated, change or install additional hard drives you can, as they say, “on the fly” (even without turning off the computer or reinstalling the operating system). This is undoubtedly a huge plus for servers.

The second aspect is related to the fact that when this mode is installed, a special NCQ technology comes into effect, which allows you to reduce the number of movements of the read heads, while speeding up simultaneous use calls to the hard drive different applications, programs and services. Finally, activating AHCI is believed to have a beneficial effect on overall system performance. Of course, as evidenced by reviews from experts and users, at home there will not be much increase in productivity, however, provided installing hard SSD drive, it is still better to enable this mode.

What not to do and what to pay attention to initially

But the most important misconception of most users is that they try to use exclusively the settings of the primary BIOS systems(By at least, you can read about this in most reviews of emerging problems). It is strictly forbidden to do this without preliminary actions in the operating system.

You can activate the mode in the BIOS only if you install the OS on a “clean” hard drive. If you perform this procedure with an existing OS on board, Windows will generate an error at startup and go into constant reboot mode. Then the complaints begin, saying that the user enabled AHCI mode in Windows, but nothing good came of it. What to say? May have been violated basic rules, because in different modifications system needs to take various actions.

How to check if AHCI mode is active?

But first you should check if the mode is enabled. Perhaps its additional activation will not be needed.

In the very simple case When you start a computer terminal or laptop, you need to go to the BIOS settings and go to the SATA Mode section.

In the operating system itself, you can use the “Device Manager”, called from the “Control Panel”, administration or the “Run” console with the command devmgmt.msc and go to the IDE ATA/ATAPI controllers section. When the mode is turned on standard devices The AHCI controller will be displayed. If it is not on the list, you will have to decide how to enable AHCI in the system. Again, the decision depends on which version of Windows is installed on the computer.

How to enable AHCI mode in Windows 7

So, first, let's look at the "seven". For the seventh and tenth versions, the actions look somewhat similar, but for Windows 8 they are quite different.

  • The first step is to call the registry editor (regedit in the Run console).
  • Expand the HKLM thread.
  • Through the SYSTEM, CurrentControlSet directories and the final Services directory, reach the msahci folder.
  • On the right, call up the menu for editing the Start parameter and set its value to zero.
  • Now in the Services directory you need to find the IastorV directory, in which, for the Start parameter, actions similar to those described above are performed.
  • Only after completing these procedures, the question of how to enable AHCI in the BIOS without catastrophic consequences for the system will cease to be a problem.

Actions in Windows 8/8.1

For Windows 8, the above method will not work, since there is a simpler solution. IN in this case First you need to set the system to minimum boot mode in safe mode. How to enable AHCI? Simple enough.

  • To do this, first call the command line (necessarily as an administrator), and enter the combination bcdedit /set (current) safeboot minimal.
  • After this, you need to reboot, at the very beginning of the restart, enter the BOIS settings and then switch the mode from IDE to AHCI.
  • After saving the settings, a reboot follows again, called command console, and the line bcdedit /deletevalue (current) safeboot is written in it, followed by another restart of the computer.

In principle, the question of how to enable AHCI in the G8 can be resolved by using special utility from Intel (of course, if you have a processor from this particular manufacturer).

  • First with official resource you need to download the driver as a file f6flpy and the customizer SetupRST.exe.
  • After this, the desired hard drive is selected in the “Device Manager”, the driver update procedure is applied, and as the driver itself in manual mode indicates the downloaded file f6flpy.
  • This is followed by a reboot, and after the system starts with already activated mode AHCI to complete the computer setup is launched executable file SetupRST settings.

How to enable AHCI on Windows 10?

As already mentioned, for the tenth version of the system the actions are somewhat similar to those performed in Windows 7. The only difference is the selection of folders and parameters.

  • In the system registry we find Services directory. Here, the storahci directory is used for the Start parameter.
  • Next, zero values ​​are set for parameter 0 in the storahci/StartOverride and iaStorV/StartOverride directories.
  • After this, you can begin to activate the primary value in the BIOS primary input/output system settings.

By the way, in the eighth version of the system, editing similar parameters can also be done. But why, if there is a simpler rational solution to the problem?

Activating AHCI in BIOS

To enter settings on desktop computers the Del key is most often used, and for laptops - F2, F12, combinations with the Esc and Fn keys or special buttons on a panel like ASSIST in Sony VAIO.

Here you need to find the section or settings AHCI mode. How to enable the required parameter in the BIOS? Just use the enter key on the SATA mode setting line, and select a parameter using the arrows with confirmation in the form of another press of Enter. When exiting, don’t forget to save the changes (F10 + Y) and reboot the system. When you restart, the system will automatically install the necessary drivers.

Possible problems

Unfortunately, sometimes when switching to AHCI mode, problems may occur. unexpected errors. Perhaps the hard drive itself does not support this mode of operation. In this case, there is no point in trying to activate AHCI.

On the other hand, if the system boots, but some errors are displayed or crashes occur precisely after switching from IDE to AHCI, you can try to troubleshoot using a specially developed utility from Microsoft called Fix It.

If neither one nor the other helps, you will have to call up the BIOS settings again and change the operating mode of the hard drive. Please note: if AHCI was activated without performing the preliminary steps in the system registry described above, these methods may not work. The solution is either to restore the system using removable media, or complete reinstallation Windows. So be careful. However, I would like to hope that it will not come to this (of course, provided that the entire sequence was completed exactly in the order that was given in the description).

When repeating or clearing, you can initially enable this mode in the BIOS, so that later you don’t have to rush around looking for a solution to activate it or troubleshoot problems and malfunctions in your computer or laptop.

Instead of a total

In conclusion, it remains to add that inexperienced users If you are not familiar with the intricacies of setting up the primary BIOS system and Windows operating systems, you should not activate this mode unless absolutely necessary. Still on modern computers with powerful processors and large volumes random access memory The performance gain will not be particularly noticeable. On old terminals or laptops there is no point in using this mode at all. Basically, as already mentioned, such settings are more suitable for servers when the hard drive is accessed by several dozen child terminals on the local network.

Competent operation of a computer becomes possible in cases where it interacts harmoniously operating system and iron. Technologies are developing, especially in the storage category. Modern SSD drives and hard drives are different in that they work faster than the versions used 5 - 10 years ago.

Data transfer is carried out using the SATA interface; it is through it that the computer is connected to the drive. Possibility noted SATA work interface in two modes: AHCI and IDE. If used in computer SSD or a modern hard drive, then AHCI mode can significantly speed up the computer. You can find out about ahci in this article.

AHCI as a parameter is one of the modes for transmitting information over the SATA interface. Through this interface It is possible to transfer data at speeds from 1.5 to 6 Gb/s. It is in AHCI mode that maximum speeds are supported, which will be relevant for working with modern drives. If you look at IDE mode, then the SATA interface supports it only for compatibility with older types of hard drives.

In the default settings of the Windows system, AHCI mode is not always enabled, even if the drives are connected via SATA to the motherboard. This significantly reduces the performance of the computer, since the disk speed indicators are limited by software. If you install ahci mode, the speed of the drive can be increased from 20 to 30%. This will become evident from the general sensations from the operation of the computer you are using.

How to determine if AHCI mode is enabled

Often, users do not even know that they need to enable AHCI mode to improve computer performance. Windows by default does not always enable AHCI mode for working with SSDs and HDDs. To check whether AHCI mode is enabled in Windows, you need to perform the following operation:

  1. Click right click mouse on "Start". Then a drop-down menu appears where you need to select “Device Manager”.
  2. Then a list opens with “IDE/ATAPI Controllers” devices.
  3. Review the list of devices in detail. If there is no ahci mode in the name, then most likely it is disabled in the system.

Another version, according to which there are no devices using AHCI mode in the list, is due to the fact that old-style drives that are not capable of working with the new mode are connected to the motherboard.

There is also a way to check in which mode the SATA interface operates using the BIOS. To do this, you need to restart the computer, and while loading, press “F2” or “Del”. This will launch the BIOS, where you need to go to the SATA Mode menu and find out whether the option is IDE or AHCI.

If you see in the BIOS menu that SATA interface is connected to work in IDE mode, you should not switch to AHCI mode. It won't do any good.

Enabling AHCI mode in Windows

In Windows operating systems, support for AHCI mode began with Windows 7. It can also be enabled in Windows XP, but this requires the ahci driver, which is available on the Internet. This driver created by enthusiasts. Similar method will not give an increase in performance, so when working with Windows XP it is better to abandon the use of AHCI mode and continue working with drives using a standard IDE.

Enabling ahci mode involves work where you need to set the appropriate settings for SATA in the BIOS. The operation is carried out before installing the operating system, otherwise the computer will display error 0x0000007BINACCESSABLE_BOOT_DEVICE when booting or will be constantly rebooted. To switch from ide to ahci mode on a Windows computer, you need to make certain changes in the registry. Let's look at the steps you need to take to separate versions operating systems.

Enabling AHCI mode in Windows 10

If you are interested in how to enable ahci mode in Windows 10, then it is worth knowing that Microsoft does not offer a setting that allows you to enable support for AHCI mode on the fly if SATA previously worked with IDE. To correctly switch to AHCI mode, you must perform the following steps:

  1. The Registry Editor starts. To do this, press the “R+Windows” keys on the keyboard. In the window that appears, you need to enter the regedit command.
  2. Then you need to follow this path in the registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStorV.
  3. In the folder that opens, select Start by double click left mouse button. In the "Values" menu you need to set it to 0, and then click "OK".
  4. Then you need to set the Start indicator to 0 in the path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci

  1. The value 0 for 0 parameters is set in the following sections:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci\StartOverride

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStorV\StartOverride

  1. When all the required parameters are set, you need to restart the computer to enter the registry. It sets AHCI mode to ensure work with the SATA interface.

When the operating system boots Windows system, you will be prompted to install the drivers required to work with AHCI mode.

Enabling AHCI mode in Windows 8 and 8.1

To enable AHCI work mode in Windows 8 and 8.1, you need to perform some operations on the command line. You need to do the following:

  1. Launch command line from the administrator. You need to right-click on “Start” and select the appropriate section.
  2. Then enter and use the following command at the command line:

bcdedit /set (current) safeboot minimal

  1. Reboot your computer. During startup, open the BIOS, where you need to switch the mode from IDE to AHCI for the SATA interface.
  2. Reboot the OS and launch the command line. Entering and using the command:

bcdedit /deletevalue (current) safeboot

  1. Another restart of the computer.

If the computer uses an Intel CPU, then it is possible to use standard utility from company. This will allow you to carry out the required actions to switch Windows to work in AHCI mode. This is done like this:

  1. Download the following files from the official Intel website:
  • SetupRST.exe is an executable file that provides configuration.
  • f6flpy – driver.
  1. Then you need to right-click on “Start” and open “Device Manager”. In the list where devices are displayed, select the menu “ Disk devices" Called context menu for a drive where Windows OS is installed. IN this menu select the “Update drivers” option.
  2. The utility that updates the drivers will start. It selects the “Search and install drivers manually” option. The downloaded f6flpy driver is then installed.
  3. The computer is rebooted, and AHCI mode needs to be activated in the BIOS.
  4. At loading Windows, you need to execute the SetupRST file, which configures the computer.

This method is only relevant for versions of computers running on Intel processors. For AMD processors There are currently no such solutions.

Enabling AHCI mode in Windows 7

You can find out how to enable ahci mode in Windows 7. following instructions. The activation method is quite close to the operation with Windows 10. Here it will be necessary to make certain changes in the registry in this way:

  1. Launch the registry editor using the combination “R+Windows”. Enter the regedit command in the Run menu and click OK.
  2. Then you need to go to the registry editor along the following path, and Stars is set to 0:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\msahci

  1. Then the Start parameter, which is located in this folder, is set to 0:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IastorV

  1. The computer reboots, and the AHCI mode for the SATA interface is selected in the BIOS.

When the computer boots for the first time, you need to install the entire list of drivers offered by the operating system.

After the computer has entered AHCI mode, errors may occur. They can be eliminated by using free utility « Microsoft Fix it". The program is distinguished by the presence of Russian localization, and it is not difficult to understand it.

In most cases, when the above steps are performed, AHCI mode works fine. The system starts working significantly faster. If no results are achieved, then you can reinstall the system when the mode change occurs. It takes time, but the result is guaranteed.

AHCI Video

You probably remember that on high-performance computers, all the power rests on the speed of operation HDD .

Because of this, we devoted a lot of time to this issue. Just recently, I discovered quite a lot interesting fact About work HDD .

AHCI mode

The point is that in BIOS your motherboard. More details here . It is possible to select the operating modes of your hard drive.

Exhibited this parameter VConfigure SATA and has 3 operating modes -Standard IDE/AHCI/RAID .

The default value isStandard IDE , which means that your hard driveSATA will emulate the workIDE , an older and therefore slower interface. I wrote more about the interface in the article -. We change this misunderstanding toAHCI 🙂

Remember: this function, works only if you have a hard drive with an interfaceSATA .

In addition, if you set the modeAHCI with installedWindows , then in response when loadingWindows, You'll get blue screen of death. I wrote more about blue screens in the article -. You can get rid of it in two ways:

1. Change the mode back to Standard IDE.

2. ReinstallWindows.

What are the benefits of this mode.

I’ll try to be laconic and just give modest test results before and after turning on this mode🙂

standard IDE mode: Test set: HDD - XP Startup
HDD - XP Startup: 8.101699MB/s

HDD - Application Loading: 6.417937MB/s

HDD - General Usage: 5.645342MB/s
Test set: HDD - Virus Scan
HDD - Virus Scan: 112.884949MB/s
Test set: HDD - File Write
HDD - File Write: 74.349472MB/s

AHCI mode: Test set: HDD - XP Startup
HDD - XP Startup: 11.094786MB/s
Test set: HDD - Application Loading
HDD - Application Loading: 7.292021MB/s
Test set: HDD - General Usage
HDD - General Usage: 7.107291MB/s
Test set: HDD - Virus Scan
HDD - Virus Scan: 113.856674MB/s
Test set: HDD - File Write
HDD - File Write: 72.895477MB/s

Tests were carried out onPC Mark 05

As you can see, there is a performance increase in all operating modes without exception. In 3 modes we see a very significant increase in speed, by more than 20%!

Do not attempt to enable this modeIDEhard drives. This is not only pointless, but also impossible. 🙂

I read on some forums various reviews to the mode activation addressAHCI . Some naively claim that there is no benefit in the mode. Honestly, this is the same as saying that between RAMDDRAndDDR3no difference. I wrote more about this in the article -.

For you, dear readers, I want to give some explanations about the benefits of this mode. The point is that with the advent multi-core computers, the most weak point computer can be consideredHDD.

Therefore, any optimization to speed up workHDDorWindowswill not only benefit them but also the entire system as a whole.

To confirm my words, look at the tests of twoSATAdisksWD Cavair Green AndWD Cavair Blue . On identical configurations, the difference in performance will be about 20%. Moreover, their characteristics:

WD Cavair Green

Cache volume, Mb: 64

Form factor: 3.5

Rotation speed, (rpm): 5400

WD Cavair Blue

Cache volume, Mb: 32

Form factor: 3.5

Rotation speed, (rpm): 7200

Of course, maybe not the most best example for comparison, but in my opinion quite clear.

I don't think that's what you bought forSATA hard drive so that it works in the old oneIDE mode. So I recommend switching your hard drive toAHCI mode and share the results in the comments.

By the way, soon I will publish a note about how to Windows installations. so as not to miss 😉

Modern hard drives are connected to the motherboard computer devices via the SATA interface, which provides operation, in particular, in IDE and AHCI modes. IDE is old regime, it is necessary to ensure compatibility with outdated components and programs. The AHCI mode is also not a new development in the IT field, it appeared back in 2004, but it is a relevant mechanism today connecting hard drives via SATA II and SATA III interface. AHCI has a number of advantages over IDE:

  • the ability to connect more devices to the motherboard;
  • operating hard drives at their highest possible speed;
  • so-called “hot swapping” of hard drives, that is, disconnecting and connecting without having to turn off the computer;
  • support for NCQ technology, which improves hard drive performance under multitasking conditions.

SATA mode is set in the BIOS. On modern laptops AHCI mode is usually set by default. But new motherboards for PC builds may come with IDE mode active for hardware compatibility purposes. You can change IDE to AHCI (or vice versa) at any time Computer BIOS, supporting both modes. Not all computers support AHCI, but most do, since this mode has been around for 12 years. The minority includes rare vintage devices that were released onto the market, respectively, before the advent of AHCI. But even if the computer is less than 12 years old, if it supports AHCI, switching to this mode may still cause problems due to the lack of appropriate settings in outdated version BIOS. In such cases, you must first resolve the issue of updating the BIOS.

1. How to find out which mode – IDE or AHCI – is currently installed

Find out which mode - IDE or AHCI - is active on the computer in this moment, you can in the manager Windows devices. Expanding the thread:

  • “IDE ATA/ATAPI controllers” in Windows versions 8.1 and 10;
  • "IDE ATA/ATAPI controllers" in Windows versions 7.

If your computer's hard drives are connected via AHCI mode, the list of devices will include a SATA AHCI controller.

If IDE mode is active on the computer, the list of branches will contain an entry, respectively, about IDE controller.

Alternative way– using the AS SSD Benchmark utility to test the speed of hard drives. If hard drives can operate in AHCI mode, but the BIOS is set to IDE, the utility will notify you of this with the red value “pciide BAD”.

If the computer is running in AHCI mode, in the utility window we will see the green value “storahci - Ok”.

These two methods will make it possible to understand which mode is currently installed. But to determine whether support for AHCI mode is implemented in the BIOS, you need to enter it and find the option to enable AHCI. Selecting SATA operating modes in different BIOS versions may be located in the “Advanced” or “Main” sections. For example, in the motherboard's UEFI BIOS Asus boards This is the “Advanced” section, in it you need to enter the “SATA Configuration” subsection and expand the options for the “SATA Mode” parameter.

Another example is the BIOS AMI (V17.9) of the motherboard MSI boards, here everything is more complicated, and not everyone will be able to immediately figure out where the AHCI setting is. In the “Integrated Peripherals” section, you must select the “On-Chip ATA Devices” subsection, and in it – “Raid Mode”, which provides a choice of hard drive connection modes.

2. Consequences of switching to AHCI mode for Windows operation

So, you can change the IDE mode to AHCI at any time BIOS settings. That's just for Windows operation such a move will not result in a slight delay at startup due to automatic installation necessary drivers, as when replacing some computer components. In this case, even getting rid of the connection to the computer components using the standard one will not help. Windows utilities Sysprep, as in the case of replacing a motherboard or processor. Changing the IDE mode to AHCI leads to serious consequences - Windows simply will not start again. As a result, we get either a blue screen of death or a cyclic reboot Windows with notification of incorrect system startup.

The fact is that IDE and AHCI modes when installing Windows are registered at the registry level. To operate hard drives in AHCI mode, a special driver is required, which is automatically installed with versions of Windows starting with Vista. Since the AHCI mode appeared later than Windows XP, the AHCI driver must first be integrated into the distribution of this version of the system, taken from the motherboard driver disk or downloaded from the Internet.

Ideally, switching to AHCI mode should be done before installation or Windows reinstallation. But there are ways to activate AHCI without having to reinstall Windows - by starting safe mode or editing system registry. Below we will consider these methods for versions of Windows 7, 8.1 and 10.

3. Mandatory measures and procedures

In principle, any experiments with Windows can lead to undesirable results, but methods for adapting the operating system to AHCI mode must be taken with particular seriousness. Because in this case, settings that affect the system's ability to boot will be affected. It is strictly forbidden to proceed with the instructions below without having previously prepared emergency means. You must either write down or create and prepare Windows installation media. Using the latter, you can log in or, as a last resort, start the process of reinstalling Windows.

The procedure is as follows:

  • Step 1 – checking the settings AHCI enable in BIOS;
  • Step 2 – preparation of emergency means;
  • Step 3 - depending on the chosen method, either configure the next system startup in safe mode, or edit the system registry;
  • Step 4 – reboot, enter BIOS and enable AHCI mode;
  • Step 5 – start the computer.

4. Windows Safe Mode

The first method is designed so that when entering safe mode Windows driver AHCI will be installed automatically. But, unfortunately, this will not work in every case. On a running system, you need to configure the next startup in safe mode, reboot, enter the BIOS and set the AHCI mode. After starting the computer in safe mode, the AHCI driver should in theory be installed. If everything goes well, all that remains is to reboot the system into normal mode work.

Universal method enter safe mode the next time you boot Windows for everyone current versions systems - use the msconfig utility, called using the "Run" command.

5. Editing the Windows Registry

If the method with safe mode did not work, you can avoid reinstalling the system by editing its registry. To launch the Registry Editor, in the “Run” command field, enter:

4.1 Editing the registry Windows 8.1 and 10

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services

In this branch, look for the “iaStorV” folder, click on it, open the “Start” parameter and set its value to “0”. Click "Ok".

Expand the “iaStorV” folder, select the “StartOverride” subfolder, open the “0” parameter and set its value to “0”. Click "Ok".

We go down alphabetically and find the “storahci” folder. Click on it and open the “ErrorControl” parameter. We remove the preset value “3” and enter “0” instead. Click "Ok".

4.2. Editing the Windows 7 registry

In the Registry Editor window, expand the branch:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services

In the branch we find the “iaStorV” folder, click on it, open the “Start” parameter and set the value to “0”. Click "Ok".

After editing the registry, reboot the computer, go into the BIOS, activate the AHCI mode and start the system.

6. If Windows won't boot

If none of the methods helped adapt Windows to work in AHCI mode, the system will have to be reinstalled. But current Windows can be launched if, for example, you need to remove the settings of installed software or save some important files, stored on drive C. To do this, you need to enter the BIOS again and set the setting back active mode IDE.

However, it may also happen that the system will not be able to boot in either AHCI or IDE mode. If there is no blue screen of death, but versions of Windows 8.1 and 10 reboot cyclically, giving a screen that says " Automatic recovery", click " Extra options».

Going to the “Select Action” menu, follow the path indicated in the screenshot below and roll back to the restore point.

If a blue screen of death appears when you start your computer, boot from installation media Windows and at the system installation stage, select the “System Restore” option at the bottom.

Once in the “Select Action” menu, we follow the steps described above.

Those who have chosen the method Reserve copy with the help of third-party software they use, respectively, bootable media backup programs.

Have a great day!

Advanced Host Controller Interface (AHCI) technology is a standard proposed by Intel that allows you to increase the read/write speed for hard drives connected to a computer via the SATA interface. If your computer has a modern hard drive (ssd for example or regular hdd sata), and the motherboard supports AHCI mode - you may have wondered how you can increase the performance of your PC.

Windows Vista/7/8/8.1 operating systems already have built-in support for the AHCI standard, so if during installation Windows detects 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 them friends; look for material on this topic separately.

In older models motherboards that have AHCI support at the chipset level, AHCI mode is disabled at the BIOS level. But what to do in a situation where the operating room Windows system 7 already installed? I think many who are faced with this problem know that by changing BIOS mode IDE on AHCI, windows simply will not start. And you will most likely get a BSOD (blue screen of death). The option that suggests itself is to change the BIOS mode from IDE to AHCI, then reinstall Windows. BUT! In this case, you lose all the data on the C drive, which can be painful if you have many applications installed there and valuable information stored there.

I propose a way to switch to AHCI mode without reinstalling the system and losing data on Windows 7. For users. Remember, you perform all actions at your own peril and risk, and no one except you is responsible for them.

Attention! The following sequence of actions must be performed BEFORE enabling AHCI mode in the BIOS settings. Otherwise the system will stop booting!

1. Press the Win+R key combination and in the window that opens, type the command regedit to open Registry Editor. For those who find this difficult, you can type regedit directly in the Start menu bar.


2. On UAC, the request “Do you want 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. In the right pane, find the option Start and edit it ( Change)

5. Set the “Start” parameter to0 , and click OK.

Default value (AHCI support disabled): 3 .

6. Close Registry Editor.

7. Restart your computer.

8. While your computer is restarting, log into Bios menu and enable AHCI support. Press the F10 key, save your changes and restart your computer again.

9. After downloading, Windows 7 will automatically install AHCI device drivers. After installation is complete, Windows will reboot one more time.

10.That's all! After Windows boot hard drives will support the AHCI standard and therefore work faster. Visual increase in productivity is a very subjective point! Yes, your computer will become faster, but besides the hard drive, there are many other things in your computer that can slow it down, so it is possible that you will not see a clear increase in speed.

P.S The performance index of my SSD, after switching to AHCI mode, increased from 7.0 to 7.6. Thank you all for your attention! If you have questions or comments, I will be glad to read them in the comments.


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