Unmountable Boot Volume blue screen error on PC: 4 ways to fix it

Sahash Khanal avatar. By: Sahash Khanal
3 minute read
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Errors aren’t uncommon with Windows 10. One of the more serious errors is the Blue Screen of Death with “UNMOUNTABLE_BOOT_VOLUME” error you might get when trying to start your Windows PC. This is a serious issue, as it blocks you from accessing all your files and data. Fortunately, there are a few things you can do to try and resolve this issue.

But before you begin, you will need a bootable media containing Windows 10. This could either be a Windows 10 DVD, or a bootable USB drive with Windows 10. Once you have the media prepared, plug it into the USB port of your computer, and boot the system. Note that you may have to select boot media by pressing F8 or F12, depending on your system configuration.

How to fix the ‘Unmountable Boot Volume’ error

Solution 1 — Use Automatic Repair

The first thing to try is to get Automatic Repair to do the fixing for you. To use Automatic Repair, simply follow these steps:

Windows 10 installation

  1. On the Windows Setup screen, select your language,
  2. The Repair your computer option should now appear at the bottom left corner of the window; click on it,
  3. On the screen that opens, select Troubleshoot,
  4. On the Advanced options screen select Startup Repair,
    Windows 10 Repair Boot
  5. From the list of OS installed in your system, select Windows 10,
  6. The repair should start, wait until the process is complete.
  7. Once the process is complete, restart your computer and remove the installation media.

If this didn’t resolve the issue move on to the next solution.

Solution 2 — Use the Chkdsk command

If the reason behind the UNMOUNTABLE_BOOT_VOLUME is some error on your hard drive, this can be detected and fixed by the Chkdsk command. Follow these steps:

  1. On the Windows Setup screen, select your language,
  2. The Repair your computer option should now appear at the bottom left corner of the window; click on it,
  3. On the screen that opens, select Troubleshoot,
  4. On the Advanced options screen select Command Prompt,
    Windows 10 Repair Boot
  5. Once the Command Prompt is open, type “chkdsk /r c:” and hit enter (make sure to replace the “C” with the letter of the partition where you have Windows installed),
  6. The process should start; wait for it to complete,
  7. Once the process is complete, restart your computer and remove the installation media.

If this didn’t resolve the issue move on to the next solution.

Solution 3 — Fix Master Boot Record

The reason behind the problem could also be a bad Master Boot Record (MBR). An MBR is responsible for identifying the location of your operating system, so a malfunctioning MBR could result in boot errors. To fix this problem, follow these steps:

  1. On the Windows Setup screen, select your language,
  2. The Repair your computer option should now appear at the bottom left corner of the window; click on it,
  3. On the screen that opens, select Troubleshoot,
  4. On the Advanced options screen select Command Prompt,
  5. Once the Command Prompt is open, type “bootrec /fixboot” and hit enter,
  6. The process should start; wait for it to complete,
  7. Repeat the same for the following commands:
    bootrec /FixMbr
    bootrec /ScanOs
    bootrec /RebuildBcd
  8. Once the process is complete, restart your computer and remove the installation media.

If this didn’t resolve the issue move on to the next solution.

 

Solution 4 — Perform a few hard reboots

Strangely enough, some users reported that after performing a few hard reboots, they got rid of the ‘Unmountable Boot Volume’ blue screen error. In other words, when this error appears on the screen, press the power button of your PC until it reboots. Then, let the PC continue the reboot process, but don’t wait until the BSoD error occurs again. Perform a new hard reboot before the BSoD error appears.

Indeed, this is a strange solution but it works for some users. Repeat the process 5 times. If the issue persists, go to solution 5.

Solution 5— Reinstall Windows 10

If all else fails, unfortunately you may have to reinstall Windows 10 altogether.

Windows 10 installation

To do this, in the initial window, once you’ve selected the language, click on Install now. Follow the on-screen instructions to reinstall Windows 10.

If neither of these solutions work for you, the problem may lie in your hardware. Contact a hardware expert or the manufacturer.

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