The "unmountable boot volume" error is common and results in a blue screen that causes your PC to crash and restart. This could either happen when you are using your PC or just as you boot up your computer. This error occurs because your machine cannot load Windows properly, since the boot volume is where Windows is located on your hard drive. But do not panic, sometimes it can just be a one-off error. Follow this guide to see how you can repair this error.

unmountable boot volume error

What Causes the "Unmountable Boot Volume" Error?

There are many reasons why this stop code "unmountable boot volume" could happen:

Corrupted system files – The files responsible for Windows 10 on your machine have been corrupted so they can no longer function correctly.

Damaged hard drive – If you have recently dropped your PC and it is using a hard drive rather than an SSD, you may have physically damaged the hard drive. Of course, physical damage is not always caused by drops and could happen randomly.

Damaged RAM – RAM is where your PC stores files and processes temporarily to speed up your PC when you are using it. Although RAM is usually more resistant to damage from drops and knocks, it can still be damaged. This then cause the problem that your PC cannot boot up.

BIOS is poorly configured – Your BIOS determines how your PC boots up. If you have changed some BIOS settings recently, that could result in this error. But this is rather uncommon actually.

How to Fix the "Unmountable Boot Volume" Error

Solution 1: Restart Your PC

You should first try to restart your PC when you face this "unmountable boot volume" error on windows because it could be a temporary issue that will be repaired after a reboot. Hold the power button until your PC powers off and then press the power button again to turn it on. Or you could try disconnecting the power cord/battery and reconnecting them to turn your PC back on.

Solution 2: Use Automatic Repair

There are two stages involved in this method. First, you must create an installation drive (which could be a USB or CD drive). Then, you need to use this drive to troubleshoot and repair your version of Windows. The repairation part would remove any corrupted system files and then install a working version of them.

Step 1: Boot your PC from the installation drive containing Windows 10.

Step 2: On the screen which says "Install now", you will need to locate "Repair your computer" (usually in the bottom corner) and then click on it.

repair your computer

Step 3: Choose to "Troubleshoot", then "Startup Repair" and then pick Window 10.

startup repair

Step 4: Windows will then proceed to automatically repair your PC and once your PC has rebooted, you can unplug your installation drive.

Solution 3: Run the Chkdsk Command

Although you cannot boot into Windows facing this error, you can use Advanced Options to get access to Command Prompt. From Command Prompt, you should be able to execute command lines that can help to repair your PC. You will need access to the installation media you created in solution 2.

Step 1: Boot from the installation media drive.

Step 2: After selecting "Repair your computer" and then "Troubleshoot", click on "Command Prompt" from the Advanced Options. Next, enter the following command:

chkdsk /r c:

command prompt

Step 3: When prompted to reboot your PC, enter Y.

Solution 4: Run System File Checker

Using the method outlined in solution 3, open Command Prompt and then enter the following commands:

sfc /scannow

Again, this will search for any corrupted Windows files and then try to fix them. This may take a while especially if many of your system files are corrupt, so please be patient.

Solution 5: Repair Master Boot Record (MBR)

Once you have opened Command Prompt from the installation media drive, enter the following commands:

bootrec /fixmbr

bootrec/ fixboot

bootrec /rebuildcd


repair master boot record

Restart your PC afterwards.

Solution 6: Reinstall Windows

If none of the solutions above works and you are still facing the "unmountable boot volume" error, then maybe you need to reinstall Windows on your hard drive.

Step 1: Plug in the Windows installation drive created in solution 2 to your erroneous PC.

Step 2: Boot from this media drive and then choose to "Install now" (you should see this option near the centre of a pop-up.)

reinstall windows

Step 3: Follow the instructions and then wait for a while as Windows is freshly installed on your PC.

If even a reinstallation does not work, then you will need to replace the physical hard drive in your PC and install Windows 10 on that. We recommend you seek help from a professional unless you are confident that you can replace the hard drive in your PC.

Recover Lost Data from Your Computer Using AnyRecover

During the process of fixing this "unmountable boot volume" error on windows 10, chances are that some data loss might happen as so many complicated steps are involved. In this case, recovering the lost data is undoubtedly the top priority. And here we bly recommend an excellent data recovery tool – iMyFone AnyRecover.

AnyRecover is a professional program designed to help you recover lost files from a full range of devices such as hard drives, USB flash drives and SD cards. It is capable of handling almost all data recovery issues – deleted file recovery, damaged hard drive recovery, lost partition recovery, etc. Check the features below to learn more about it:

  • High recovery rate ensured by all-round and deep scan feature which dig outs all the data recoverable.
  • Unique algorithms enable it to scan at a fast rate.
  • Preview lost files before and selectively recover what you need exactly.
  • Data security is absolutely guaranteed.
  • Supports all kinds of files including photos, videos and documents
  • Three easy steps to operate. No technical knowledge is required.

To recover lost data from your Windows after fixing this "unmountable boot volume" error, download and install iMyFone AnyRecover first:

Windows version Mac version

Step 1.Select a Location

Launch this program and select a location where you have lost data. Click "Start" to start the process.

select a location

Step 2.Peform the Scanning Process

AnyRecover will perform an all-round and deep scan at this time. You can also pause and resume the scanning process anytime you want.

start scan

Step 3.Preview and Recover

Feel free to preview the files shown on the screen after the scanning is completed. Select what you want to get back and click "Recover".

preview and recover


"Unmountable boot volume" error on Windows 10 may upset you a lot but this is not a dead-end situation. With the fixes mentioned above, we hope we've helped you and in case of data loss, remember to use iMyFone AnyRecover. Actually, whatever the reason is for the loss of important files, AnyRecover is always the tool you can rely on trustingly to find back what you need.

Windows version Mac version