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Solved: Windows 10 UNMOUNTABLE_BOOT_VOLUME BSOD Error (5 working Solutions)

Recently upgraded to windows 10 October 2020 update and at startup, it failed to start with UNMOUNTABLE_BOOT_VOLUME Blue Screen error? Let’s understand what is windows 10 Unmountable Boot Volume BSOD error. why its causing windows fails to start normally. And some applicable solutions you apply to fix this windows 10 blue screen error.

Issue: After Windows 10 upgrade getting unmountable boot volume BSOD

Recently upgrade my laptop to windows 10 version 20H2, Everything was good until yesterday when I started my computer and got the BSOD error unmountable boot volume stop oxooooooed. I tried most of the possible fixes I’ve seen on the Internet about this issue with no solutions found. Has anyone found a way to fix this issue that doesn’t involve wiping your drives and reinstalling windows?


What Is the Unmountable Boot Volume Error?

The “boot volume” is the system partition of your hard drive that holds the Windows operating system. But If due to any reason when your computer can’t load Windows properly from the system partition this will result startup failure with a blue screen of death error “UNMOUNTABLE_BOOT_VOLUME” stop oxooooooed.

Unmountable Boot Volume error usually occurs due to a damaged file system or corrupted Windows files. Again Window update bug, disk drive failure, Security software or Faulty hardware device or incompatible Device driver also Cause this windows 10 BSOD error. Whatever the reason, here some solutions you may apply to fix this Blue Screen error.


Whenever you get windows 10 Blue Screen error at startup, The first thing you have to do is disconnect all external devices such as a printer, scanner, external HDD, USB device etc ( expect keyboard&mouse ) then start windows normally. To check and make sure any device/ new installed device driver not causing the BSOD on windows 10.

If after one BSOD restart windows start normally then jump to these steps to avoid feature blue Screen errors. Or if due to this Unmountable Boot Volume windows frequently restarts perform steps below.

Use Windows Automatic Repair

As we are unable to start access windows 10 normally, we need to access advanced options where you can get various troubleshooting tools like startup repair, safe mode, advanced command prompt and more. Lets first access advanced options and perform startup repair.

First of all boot windows from an installation media, (If you don’t have here check how to create a windows 10 bootable USB / DVD).  Let Windows start from your USB/DVD until it loads up, and click the Next button. You’ll see the Install now screen. But you’re not interested in reinstalling Windows; click Repair your computer in the bottom-left instead.

Repair your computer

On the following screen, select Troubleshoot to get a list of Advanced Options. Choose Startup Repair and choose the target OS, Windows 10 (or your version). The repair will be started immediately. Please wait patiently for the process to be finished. Once it’s done, exit the installer and try to boot your computer normally.

Advanced options

Repair the Master Boot Record

The Master Boot Record (MBR) contains information about where and how your operating system is located your hard drive and helps it load properly when you turn your computer on. If this becomes corrupted, it can lead to an unmountable boot volume error. So if The startup repair failed to fix the problem and still windows frequently restart with UNMOUNTABLE_BOOT_VOLUME BSOD error. Lets repair MBR and BCD (Boot Configuration Data) which may very helpful to deal with issues like this.

Then Again access advanced options from your Windows 10 install media and select Repair your computer > Troubleshoot. This time, on the Advanced Options screen, choose Command Prompt. and perform the command below to repair MBR, Rebuild BCD and fix Boot manager problems

bootrec /fixmbr

bootrec /fixboot

bootrec /rebuildbcd

bootrec /scanos

Boot MBR and Rebuild BCD

After complete these commands type exit to leave the Command Prompt, Then reboot your system and check this time windows started normally without any BSOD errors.

Run the Ckhdsk Command

If an automatic repair and MBR repair didn’t solve your problem, then boot into safe mode from advanced options and run Chkdsk command to check and fix disk drive errors. When windows start on safe mode search for cmd, right-click on command prompt and select run as administrator. Then type command chkdsk C: /f /r

Note: Here C: is your System drive letter. The /r flag locates any bad sectors on your disk and fixes those errors and /f Fixes errors on the disk.
Run Check disk on Windows 10

Chkdsk may ask you to run next time the system restarts. If it does, enter Y for yes and reboot to start it. This will start the scanning and repairing process for drive C: wait until 100% complete the scanning process after that restart windows and check may this helps to fix windows 10 BSOD error.

Run SFC utility and DISM command

Run system file checker its Another effective solution ( Scan and restore missing corrupted system files )you must apply if windows fail to fix unmountable boot volume after applying startup repair, repair BCD/MBR, Check drive errors.  Again open the command prompt ( admin ) on safe mode and type command sfc /scannow and hit the enter key. This will scan for corrupted system files, If found any the SFC utility will restore them from a special folder located on %WinDir%\System32\dllcache. Wait until 100% complete the scanning process after that restart windows and check, You never get BSOD error if missing corrupted system files causing the issue.

system file checker utility Windows 10

If system file checker scan results windows resource protection found corrupt files but was unable to fix some of them. Then run the DISM command “dism.exe /online /cleanup-image /restorehealth” which repair the system image and allow SFC to do its job. You can read more about DISM command from here.

Run Memory Diagnostic Tool

Sometimes this Unmountable Boot Volume Blue Screen STOP: 0x000000ED can happen due to bad memory so for this try  Run Memory Diagnostic Tool.

Run the Hardware and Device troubleshooter from settings -> update & Security -> Troubleshoot -> select Hardware and Device and run the Troubleshooter for check and make sure any faulty hardware device not causing the BSOD error at startup.

Also Recently installed Third-party applications to check and make sure application compatibility not causing the issue. Open Control Panel -> All Control Panel Items -> Programs and Features.  Heres elect the recently installed Application and click uninstall Restart windows and check.

Open device manager and update/reinstall the Display driver with the latest version. As users report reinstall the Display driver mostly fix maximum blue Screen errors on windows 10.

If the problem started for you after installing windows 10 version 20H2 and applying above these solutions didn’t fix the problem then may the windows update bug causing the issue. As Microsoft recommends Roll back windows 10 to the previous version, Defer windows update and wait for Microsoft to fix the bug and the OS gets stable.

performing the above solution didn’t fix the problem, Still, windows restart with BSOD error then its time to utilize the system restore feature, which reverts windows configuration to the previous working state without affecting any files.

Did these solutions help to resolve “Windows 10 Unmountable Boot Volume BSOD Error“? Let us know which option worked for you.

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