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 in a startup failure with a BSOD error “UNMOUNTABLE_BOOT_VOLUME” stop oxooooooed. Windows blue screen of death can occur for different reasons, corrupted system files, outdated driver, faulty hardware, or software conflict are common. If you are experiencing such blue screen error on Windows PC try following solutions to fix Unmountable Boot Volume Error on Windows 11/10.

What causes Unmountable Boot Volume Error

This is a hard drive related error. If your partition experiences any unexpected error, you can experience this error. Even any other faulty hardware component can cause this error. Again, Virus inaction or any third-party software that can modify your partition can be the culprit. If your boot.ini file is deleted somehow, You also can experience this BSOD.

So, here are the things that cause UNMOUNTABLE_BOOT_VOLUME –

  • Faulty boot volume.
  • System file corruption.
  • Damaged or faulty hard drive.
  • RAM or memory problem..
  • Faulty connection cable.

Sometimes, Misconfigured BIOS settings can cause this error and stop you to boot into your PC. But it is rare.

How to Fix Unmountable Boot Volume Error

You can fix this problem by following different ways. Each method depends on the situation. Anyway, these are some working methods –

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, then start Windows normally.

Automatic Repair

This is the first method we should try. If you are lucky, it will fix the unmountable boot volume error. To do automatic repair, you will need a bootable Windows installation media. To do it –

  • Insert the installation media and restart your PC.
  • Now, Boot from it and you will be asked for pressing any key to continue. Press any button from the keyboard.
  • In the Windows Setup box, click on Next.
  • Then click on Repair your computer.
  • Go to Troubleshoot > Advanced Options.
  • Now click on Automatic Repair and wait for the process to complete.
  • It will fix the problem and you won’t face any BSOD from the next boot up.

advanced options

If you still face the issue, Follow the next methods –

Repair the Master Boot Record

The Master Boot Record (MBR) contains information about where and how your operating system is located 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.

  • Again access advanced options from your Windows 10 install media
  • Select Repair your computer > Troubleshoot.
  • This time, on the Advanced Options screen, choose Command Prompt.

Windows Advanced Options

perform command below to repair MBR, Rebuild BCD, and fix Boot manager problems

  • bootrec /fixmbr
  • bootrec /fixboot
  • bootrec /rebuildbcd
  • bootrec /scanos

fix bootrec Errors

  • After complete these commands type exit to leave the Command Prompt,
  • Then reboot your system and check this time Windows started normally

Fixing Disk Controller Drivers to Repair Unmountable Boot Volume Error

Corrupted disk controller drivers can be the culprit. So, you can try reinstalling, updating or roll back it to repair the BSOD. If you have started facing the problem after updating drivers, You can roll back it. Else, you can try updating or reinstalling the disk controller. To do it –

  • Press Windows Logo + R from the keyboard.
  • Type devmgmt.msc and press enter.
  • In the device manager find and expand IDE ATA/ATAPI Controllers. Now, You will see the disk controller drivers. Double click on it.
  • Now click on the Driver tab.
  • Now, you can do update, roll back or uninstall the driver by clicking on the perfect option. For example, you want to roll back it to the previous stage, then you should click on Roll Back Driver and follow the next instructions. If you want to reinstall it, just click on Uninstall to remove the driver. Then install it again with the latest version. You also can click on Update driver to keep it up to date.
  • After trying these things, Check if you are still facing the unmountable boot error or not.

Running Chkdsk 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 the 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.

  • Chkdsk may ask you to run next time the system restarts.
  • If it does, enter Y for yes and reboot to start it.

This is a very common method. It may help you to solve unmountable boot volume error. If it doesn’t work, You also can try to fix hard disk problem by following other methods.

Checking for Memory Problems

If none of these work, Probably there is something wrong with your RAM. So, You should check for the problems and try to fix that. You can run the windows memory diagnostic tool to find and fix the RAM problems.

  • Press Windows key + R, type mdsched.exe and hit ok,
  • This will open the Windows memory diagnostic tool on your PC,
  •  You will be asked to restart your PC. Select Restart now and check for problems (recommended).
  • Now your PC will be restarted automatically and prompt you the diagnostic window with progress stats.
  • Wait for several minutes to be completed. Sometimes, it may take more time than normal.
  • After completing diagnosing memory problems, Your PC will be restarted and boot up normally. When you log on, It will show you the Result. But sometimes, You may not see the result automatically. In that case, You have to find it manually.

Running SFC /SCANNOW

Sometimes, faulty system files can cause this blue screen error of Windows. In that case, sfc scannow command can help you. It will repair the corrupted system files and may fix the unmountable boot volume error. To do it –

  • Just open the command prompt as administrator.
  • Now type sfc /scannow and press Enter.
  • It will fix the problematic system files of Windows and may take several minutes to complete.
  • If you are a lucky person, It can fix your problem.

Run sfc scan windows 11

Last Methods:

Actually, the First method should repair the problem. I think Any of the first 3 methods will work for you. If any methods don’t work, You can try a system restore or reinstalling Windows. It should fix the problem. But sometimes, Clean Windows installation may fail to solve unmountable boot volume errors. In that case, I should suggest you to install Windows on a different hard disk or Pendrive and see what happens.

These are the very common methods i found online. Else, You can read a thread from Microsoft Community which also may help you.

Robeg
Robeg
I am Robeg founder of this blog. My qualification. completed Bachelor of Arts (BA) and Microsoft Certified Professional (MCP). With a strong background in computer applications love write articles on Microsoft Windows (11, 10, etc.) Cybersecurity, WordPress and more.

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