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Home » How to Fix Unmountable_Boot_Volume Windows 11/10

How to Fix Unmountable_Boot_Volume Windows 11/10

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If you encounter the Unmountable_Boot_Volume error on Windows 11, 10, or 8, it can prevent your PC from booting up. This error is categorized as a Windows startup error that appears before the booting PC. You may receive the following error message on a Blue screen or Black screen.

Error Message

Your PC ran into a problem and needs to restart.

Unmountable_Boot_Volume - 0x000000ED


There can be a variety of reasons behind the above problems, but some of the most common reasons are as follows:

  1. File System Crash: This is one of the most prominent reasons for the mentioned error. If the file system is corrupted or damaged, then certain parts of the information stored on your hard drive can’t be accessed by your operating system, thus causing boot-related issues.
  2. Incomplete or Incompatible Windows Updates: If you have installed a major Windows update that happens to be incompatible with your PC, you may encounter the Unmountable_Boot_Volume error.
  3. Misconfigured BIOS: Making numerous changes in the BIOS settings can result in incorrect configurations, potentially causing this error.
  4. Corrupted MBR or GPT: The Master Boot Record (MBR) or the GUID Partition Table (GPT) are crucial files when your PC starts loading Windows. If either the MBR or GPT file becomes corrupted, your PC won’t be able to locate the operating system, leading to various boot-related errors such as Inaccessible_Boot_Device, Windows Failed to Start, Error While Reading The Boot Configuration Data, Operating System Not Found, No bootable device, etc.
  5. Hardware Malfunction: Failing hardware components such as SSDs, RAM, Motherboards, Power Supplies, and others can also be significant reasons for encountering this error.

How to Fix Unmountable_Boot_Volume error on HP, Dell, Asus, Acer, and Lenovo laptop?

Regardless of your laptop’s manufacturer, the Unmountable_Boot_Volume error can affect any PC running Windows 11, 10, 8, or other versions of the Windows operating system.

In this troubleshooting guide, we will walk you through step-by-step solutions to resolve the aforementioned error.

   Important Notice:

Before attempting any critical fixes on your Windows OS, it’s crucial to recover and store your data in a safe place. EaseUS Data Recovery Wizard comes to the rescue for recovering data from a crashed PC.

No matter if you’re facing the dreaded blue screen of death, startup failures, or boot problems, this tool enables you to boot up your PC and recover your precious data effortlessly. So, be sure to use EaseUS Data Recovery Wizard to safeguard your files before proceeding with any fixes!

Note: Free Version allows you to recover upto 2GB Data.

Solution 1: Perform Automatic Repair using Windows Installation Disk.

To perform this step, you’ll need a Windows Installation disk. With the Windows Installation disk, you can effectively repair issues such as corrupted file systems, missing system files, and other damages.

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.

Solution 2: Repair MBR or GPT

Another crucial step is repairing the MBR or GPT files, as corruption in these files can lead to various types of startup issues. You can perform MBR/GPT repair as follows:

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Repair MBR using EaseUS
Step 1: Create Bootable USB drive using EaseUS. Launch EaseUS Partition Master, and click “Bootable Media” on the toolbar. Select “Create bootable media”.
Step 2: Boot your PC using Bootable USB Drive.
Step 3: Click “Toolkit” and choose “Rebuild MBR”.
easeus mbr repair

Repair MBR Manually

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.

Solution 3: Run SFC, CHKDSK and DISM commands.

These three commands form a perfect trio for a Windows health checkup. These tools not only scan for bad sectors in SSDs, assess the file system’s integrity, and examine Windows images but also have the capability to fix detected issues.

SFC/Chkdsk/Dism - Step by Step
Step 1: Open Command Prompt as Administrator.

open command prompt as administrator in Windows 8, 10 & 11

Step 2: 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 /f c:

It will show you message:

Chkdsk cannot run because the volume is in use by another process. Would you like to schedule this volume to be checked the next time the system restarts? (Y/N)

Press Y and Press Enter. The disk checking will start on next pc start.

Solution 4: Test Hardware Malfunctioning

You must run various test to determine if any hardware installed on your computer is not working properly. To determine the health of your PC’s hardware, follow these steps:

  1. Shutdown and Disconnect: Turn off your computer and disconnect the power cable from the electrical socket.
  2. Clean RAM: Remove the RAM modules and gently clean the connectors with a soft cotton cloth and a suitable cleaning solution (such as Thinner, Petrol, or spirit). Re-insert the RAM modules securely.
  3. Re-seat SSD: If you’re using an SSD, remove it and then re-insert it. For desktops, consider changing the SSD SATA cable if applicable.
  4. Swap SSD: Often, boot issues are caused by a failing SSD. If you have another SSD available, try replacing it with the old one and then reboot your computer.

The ‘Unmountable_Boot_Volume’ error can also occur due to various other reasons such as a failing motherboard, virus/malware infection, registry file corruption, and more. In such cases, re-installing Windows can be a solution to resolve this error.”

How to Prevent Unmountable_Boot_Volume error in Future?

Maintaining a healthy PC is often better than dealing with bugs and errors. A healthy PC provides an error-free environment, enhanced performance, improved security, and helps safeguard your privacy. Manually managing Windows 11/10 can be time-consuming, and there’s a high likelihood of forgetting regular maintenance tasks. That’s why it’s advisable to consider installing the Outbyte PC Repair Tool. This tool can efficiently fix and optimize your Windows OS, ensuring your computer runs smoothly and securely.

Windows is made with huge number of dll files, exe files, sys files, various types of services, databases, etc so, it is not possible to keep monitoring all the files always. A brilliant PC Optimizer tool repairs damages, fix errors, update windows and drivers, and eliminate various types of errors silently.

Outbyte PC Repair Tool does all the above task easily and provides you an errorfree and smooth Windows environment to work so that you can focus on your business only.

3 Steps to Fix this Error
Step 1. Download Outbyte PC Repair Tool [File Size: 16.4 MB]
Step 2. SCAN your Windows PC
Step 3. Click Fix button to Repair Error


To fix the Unmountable_Boot_Volume error on Windows 11/10, perform automatic repair, repair GPT/MBR, run SFC/DISM/CHKDSK, and test for failing hardware.