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Home » Inaccessible_Boot_Device – Step by Step Fix – Windows 11/10

Inaccessible_Boot_Device – Step by Step Fix – Windows 11/10

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Is your PC afflicted by the Inaccessible Boot Device issue, and are you fervently seeking a solution? If your answer is affirmative, you’ve arrived at the right destination. This article aims to guide you through the process of rectifying the Inaccessible Boot Device error on Windows 11/10/8.

The Inaccessible_Boot_Device error manifests during the Windows startup phase. When you attempt to boot your computer, a Blue/Black screen of death emerges, accompanied by the message “Inaccessible Boot Device,” leaving you with no recourse other than restarting your machine. This phenomenon occurs because the Windows OS encounters difficulty in accessing the Windows partition or comprehending the instructions within the Boot Manager file.

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How to Fix Inaccessible Boot Device error?

If you are unable to boot your computer due to the aforementioned error, employ the following methods to regain access to your system.

Method 1: Repair the corrupted MBR file

The MBR file, an abbreviation for Master Boot Record, assumes a pivotal role in the Windows startup process. It houses crucial instructions that Windows relies upon during its loading sequence. This file serves as a repository for essential data, including the location of primary partitions, indispensable drivers, hardware details, and various other information. When this file becomes corrupted or compromised, your computer’s ability to boot is hindered, often manifesting as the Inaccessible_Boot_Device error.

Manually Repair MBR file - Step by Step
Step 1: Boot your PC using the Windows Installation media. It will open Windows Installation Wizard. Click Next.

windows os installation

Step 2: Select Repair your computer.

repair your computer option windows 10 & 11

Step 3: It will open the Advanced Startup Option or Windows Recovery Environment. Click on the Troubleshoot.

Troubleshoot in Advanced Startup Menu Windows 10 & 11

Step 4: Select Command Prompt.

open_command_prompt in advanced startup option

Step 5: Type the following command and press Enter to execute it.
bootrec /fixmbr
bootrec /fixboot
bootrec /RebuildBcd
Step 6: Now restart your computer, and you will not see the boot time error message Bootmgr is missing.
   Copy OS and data to another HDD/SSD
   Convert MBR to GPT for Windows 11 upgrade
   Convert to NTFS/FAT32
   Repair File System/Windows Startup error
   Create/Delete/Resize/Move/Format/Wipe/Extend/Merge Partition
  Create WinPE Bootable Disk

 65M Users       99% Disk Management       12K Downloads/Day       4.7 TrustPilot Rating       Windows 11/10/8/7 & Server 2022/2019/2016/2012/2008/2003    

Method 2: Repair Windows Installation

Repairing the Windows installation can effectively address not only the Inaccessible_Boot_Device error but also various other issues that might be plaguing your system. This restorative process proves invaluable when confronted with a multitude of Windows-related problems. To execute this corrective action, you will require a Bootable Windows Installation USB Drive or DVD Drive.

Here’s the step to Repair Windows Installation.

Startup Repair - Step by Step
Step 1: Boot your PC using the Windows Installation media. It will open Windows Installation Wizard. Click Next.

windows os installation

Step 2: Select Repair your computer.

repair your computer option windows 10 & 11

Step 3: It will open the Advanced Startup Option or Windows Recovery Environment. Click on the Troubleshoot.

Troubleshoot in Advanced Startup Menu Windows 10 & 11

Step 4: It will open the Advanced startup menu. Go to the Troubleshoot ➜ Advanced options ➜ Startup Repair.
Startup Repair Windows 10 & 11
Step 5: Select OS.
Startup Repair - Select OS
Step 6: Wait until it diagnoses and repairs your PC.
repair-windows-from-usb-5

Method 3: Run SFC, CHKDSK, and DISM command

Run SFC, CHKDSK, DISM command
Step 1: Boot your PC using the Windows Installation media. It will open Windows Installation Wizard. Click Next.

windows os installation

Step 2: Select Repair your computer.

repair your computer option windows 10 & 11

Step 3: It will open the Advanced Startup Option or Windows Recovery Environment. Click on the Troubleshoot.

Troubleshoot in Advanced Startup Menu Windows 10 & 11

Step 4: Select Command Prompt.

open_command_prompt in advanced startup option

Step 5: Now run the following commands one by one.
i. System File Checker tool

sfc /scannow

ii. Run Dism command

Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /RestoreHealth

iii. Run Disk checking utility.

chkdsk C: / f / x / r

Method 4: Uninstall recently installed Windows updates.

Uninstall Updates - Step by Step
Step 1: Open the Advanced Startup Option or Windows Recovery Environment. Click on Troubleshoot.

Troubleshoot in Advanced Startup Menu Windows 10 & 11

Step 2: Go to the Troubleshoot ➜ Advanced options ➜ Uninstall Updates.
win-re-advanced-options
Step 3: Select Uninstall the latest quality update.
win-re-uninstall-updates
Step 4: click on the Uninstall quality update button and remove the updates.
win-re-uninstall-quality-update

Method 5: Select the Correct Boot Device in BIOS

Verify Boot order in BIOS - Step by Step
Step 1: Restart your computer and access the BIOS or UEFI settings. The process varies by computer, but it usually involves pressing the “Delete,” “F2,” “F10,” or “ESC” keys during startup.
Step 2: Locate the “Boot” or “Boot Order” section in the BIOS/UEFI menu.
2_bios_boot_option
Step 3: Set the primary boot device to the drive where Windows 11/10 is installed. This is usually the internal hard drive or SSD.
Step 4: Save the changes and exit the BIOS/UEFI settings. Your computer will attempt to boot from the selected device.

Method 6: Replace the faulty hardware.

If none of the previously mentioned methods yield successful results, it is indicative of a potential hardware issue within your PC. Faulty components such as RAM, SSD, or the motherboard might be at the root of the problem. In such cases, it is advisable to seek the expertise of a qualified technician. They can diagnose specific hardware malfunctions and recommend necessary replacements to restore your system’s functionality.

Summary

To fix the Inaccessible_Boot_Device error on Windows 11/10, you need to repair the corrupted MBR file, perform system restore, run SFC/DISM/CHKDSK, etc.