Windows 8 : Switch from AHCI to IDE mode

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Windows fails to boot when the operation mode changes from AHCI to IDE. Most of you might have noticed that after installation of OS the operation mode changes which prevents you from booting your computer. Here is the tutorial how you can switch from AHCI to IDE operating mode.

change ahci to ide operating mode
Generally there are two types of operating mode, first is the Advanced host controller interface (AHCI) and the second one is the Integrated drive electronics (IDE). You are often presented with options for selecting the type of operating mode i.e. whether AHCI or IDE.

AHCI is a standard application programming interface used for the SATA interface. Serial ATA (SATA) is a computer bus interface provided to connect the host bus adapters to mass storage devices like that of hard disk drives and optical drives. IDE is older interface standards that were used for storage devices like hard drives and optical drives. To maintain backward compatibility, most of the SATA controllers allow the user to choose AHCI or IDE mode. AHCI mode doesn’t provide much speed to drive the SATA, but it exposes various advanced features of SATA that Is not the same with the IDE mode.

In addition to the above stated feature, AHCI mode also allows utilization of other feature like Native Command Queuing (NCQ), hot plugging, etc. Despite of the features mentioned here, you need to change from AHCI to IDE mode depending on the compatibility of the system. Depending on the compatibility of your system you need to switch from AHCI to IDE mode.

Steps to switch from AHCI to IDE Mode in Windows 8 & 7 Computer

  • First, close all the active programs and Apps and open Run dialog box. Hold Windows key + R to open Run dialog box
  • Type regedit and hit enter. You will get to Windows registry Editor
  • Now, Scroll down to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\pciide

modify pciid ahci

  • Go to right pane and right click on start entry and select Modify
  • Assign value 0 in the value data box instead of 3 and then hit OK to exit from the registry editor
  • Restart your system to effect the change
  • Now, get to BIOS settings upon the start up of the PC and enable IDE there

ide enabled

  • Save the new BIOS configuration and again reboot your computer.

After the drivers are installed your system restarts again.

Steps to Switch from IDE to AHCI mode

  • Open the registry editor
  • Navigate to Registry Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci

change ide ahci registry

  • Assign the Start value to 0
  • Click OK and close the Registry
  • Reboot your computer
  • Now, get to BIOS settings upon the start up of the PC and change the disk mode to AHCI
  • Save the new BIOS configuration and reboot Windows.

When Windows starts, it will detect the change and load new disk drivers, and restarts one more time. Upon following the above steps you can easily switch from AHCI mode to IDE mode or vice versa in your Windows PC.


Priyanka contributes to the Computer and Gadgets section on Techcular.

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