The inaccessible boot device error in Windows 11 or Windows 10 is a BSOD error that prevents Windows from booting properly. This error can prevent you from starting Windows, which is inconvenient. However, once you know what caused the boot device error on your PC’s Windows 11, you can easily fix it. A change in your system is usually, but not always, the cause. I’ll show you how to fix the inaccessible boot device error in Windows 11 in this guide. # How To Fix Inaccessible Boot Device Error In Windows 11

How To Fix Inaccessible Boot Device Error In Windows 11

The inaccessible boot device error only means that Windows is unable to access the system partition (i.e., your hard drive) during system startup. These errors are most common on PCs with SSDs, and they can be caused by a variety of factors.

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Modifying any BIOS settings, outdated or corrupted drivers, a bad hard drive, or simply updating Windows, for example, can all result in this error. I’ve listed a few simple solutions for resolving the Inaccessible Boot Device error on Windows 11 below.

Try to switch to AHCI in BIOS

You can try this fix first if you were fiddling with the BIOS settings or recently updated your BIOS. In BIOS, there is a mode for Sata drives that you can select. If you’ve chosen a mode other than AHCI, you’ll have to deal with this problem. To get to your BIOS settings, follow the steps below:

• Start by looking in the BIOS for Storage Configuration > Sata Configuration, Sata Emulation, or something similar.
• If you can’t find the above settings in the BIOS, you’ll need to conduct some research and look for the term “AHCI.”
• Once you’ve found it, switch your SATA controller to AHCI mode (or change Sata mode to AHCI), which should solve the problem.

Update IDE ATA/SATA Controller Drivers

If the above method did not work for you, it may be worth your time to update the drivers. You can try updating or reinstalling an outdated or corrupted driver that is causing the inaccessible boot device error in Windows 11. Take the steps outlined below.

• To update the driver, start the computer in Safe Mode.
• To open the Computer Management console in Safe Mode, right-click on Computer and select Manage.
• On the right side, choose Device Manager, then go to the left panel and select the little arrow on the IDE ATA/ATAPI Controllers side.
• Select Update Driver from the context menu of the SATA AHCI Controller.
• After that, choose whether you want Windows to look for a newer version of the driver automatically or if you want to use the driver installation files you’ve already downloaded.
• Simply choose the first option to download and install the appropriate drivers from the manufacturer’s website.
• After the driver has been installed, restart your computer.
• Done.

Try to run a system file scan

• Click Start, then type CMD into the Search box.
• To open the Command Prompt window, select Run as administrator.
• DISM.exe /Online /Cleanup-image /Restorehealth DISM.exe /Online /Cleanup-image /Restorehealth DISM.exe /Online /Cleanup-image /Restorehealth DISM.exe /Online /Cle
• After the process is finished, type the following command and press Enter: sfc /scannow
• Simply wait for the scan to finish 100 percent verification before checking the results.