Getting UNMOUNTABLE_BOOT_VOLUME BSOD After install Windows 10 October 2018 update? Or struggling from “Unmountable Boot Volume” error, which prevents you from logging in to Windows 10? This error Windows 10 unmountable boot volume BSOD Error STOP: 0x000000ED mostly occurs if Windows is unable to access the volume containing the boot files. Which occurs when there is a problem in the system hard drive or in the partition where Windows is installed. Pro Tip: (There are so many reasons for your Hard disk corruption and most of are junk software’s installation, viruses, overwritten of data.).

That mostly occur after windows 10 upgrade, As a number of users report this issue on Microsoft forum like:

When I turned on my PC, the Windows 10 logo screen appeared as it would normally do, but the circle of dots remained on for an extended period of time, and then a blue screen appeared saying that “Your PC ran into a problem, and needs to restart”. At the bottom of that screen, a stop code had said “UNMOUNTABLE BOOT VOLUME“.

Unmountable boot volume windows 10 BSOD

What causes unmountable boot volume windows 10

There is a various reason that causes error UNMOUNTABLE_BOOT_VOLUME Its due to faulty hardware or misconfigured hardware settings. It can also occur if boot related files are corrupted. a damaged file system which failed to mount or the basic input/output system (BIOS) settings are configured to force the faster UDMA modes.

It can also occur if there is a problem in the system hard drive or in the partition where your Windows is installed. Or a third-party software and services and more. Whatever the reason here some solutions you may apply to fix unmountable boot volume on windows 10.

Fix unmountable boot volume

First of all remove all external devices, that include printer, scanner, external HDD etc and restart windows. This will fix the problem if any hardware & software confliction causing the issue.

If you are getting this error message UNMOUNTABLE_BOOT_VOLUME frequently even after many attempts of restarting your PC. And you can’t reach your lock screen to be able to log in and proceed to troubleshoot your PC, That cause you need to create an installation media and perform some Advanced troubleshooting steps to fix the issue.

Automatic Repair

When you are ready with Installation media, Insert it and boot your system from installation media.

Skip the first screen and on next screen, select Repair your computer option found at the lower-left corner

repair your computer

Choose Troubleshoot, then Advanced options.




Select Automatic repair, and choose the target OS, Windows 10

advanced Options windows 10

From here Windows will run an automatic repair that will take care of your issue. During this diagnostic phase, Startup Repair will scan your system and analyze the various settings, configuration options, and system files as it looks for corrupt files or botched configuration settings. Once it’s done, reboot your system and check this time windows started normally.

Rebuild Master Boot Record (MBR)

If startup repair failed to fix the issue, then let’s rebuild Master Boot Record (MBR) Which contains information about where Windows lives on 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.

To do this Again Access Advanced option from Repair your computer > Troubleshoot. This time select Command Prompt and perform command “bootrec /fixmbr“ that fix Master boot record problems.

Repair master boot record (MBR) file and Boot configuration data (BCD)

In additionally perform bootrec /fixboot and bootrec /rebuildbcd to fix Boot manager problems and Rebuild the Boot record.

Check Disk Drive Errors

After repair Master Boot Record problems, let’s Apply chkdsk command with additional parameters to force check disk check and fix disk drive errors. On the same command prompt type command chkdsk /f /r

Here /F Fixes errors on the disk and /R Locates bad sectors and recovers readable information Additionally you can add /X that Forces the volume to dismount first if necessary.

chkdsk to fix Hard disk Errors

After complete, the scanning process, restart windows and check this time system started normally. There is no more Unmountable Boot Volume Error.

Boot windows Into safe mode

Still, need help? let’s boot into safe mode to perform some other troubleshooting steps. Safe Mode is an inbuilt troubleshooting feature which disables unnecessary drivers and programs during the startup process. Windows Safe Mode loads the operating system with a minimal set of system files and device drivers – just enough to boot the Windows OS. In Safe Mode, the startup programs, add-ons, etc, do not run. For windows 7 restart the windows and press F8 key at startup and select safe mode boot. Read How To boot Windows 10 and 8.1 into Safe Mode.

When you are on safe mode first uninstall recently installed applications which may be causing confliction that results Unmountable Boot Volume Error.

  • Simply press Windows + R, type netapp.wiz and ok then right click on the recently installed application and uninstall them.



Corrupted missing system files also, sometimes cause different blue screen error, include Unmountable Boot Volume Error We recommend to run System file checker utility that scan and restore missing files from a compressed folder located  %WinDir%\System32\dllcache.

System file checker utility

Windows 10 Added fast startup feature to reduce the boot time, and start windows very fast. But this feature has some disadvantages which may cause this Blue Screen error. We recommend to Disable Fast startup and check the problem solved for you or not.

Also sometimes junk, cache, system error, Temp, junk files or broken registry entries cause different startup problems on the windows computer. We recommend running free system optimizer like Ccleaner To clean up these unnecessary files. And fix broken missing registry entries.

If none of the above solutions failed to fix the windows 10  blue screen error, It’s time to utilize the system restore feature which reverts back current system settings to previous working state.

Did these solutions help to Fix the Unmountable Boot Volume Error in Windows 10? Let us know which option worked for you, Still need any help feel free to discuss on comments below. Also, read iTunes Not Working on Windows 10? Here 5 Different iTunes problems and solutions.