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How to fix unmountable boot volume

Here you will find out:

  • what is an “unmountable boot volume” error
  • how to fix the issue
  • when DiskInternals can help you

Are you ready? Let's read!

What is an “unmountable boot volume” error?

The "unmountable boot volume" error may look very frightening, since it means you cannot load the operating system and gain access to your data. In general, the boot volume is one of the most important partitions of the hard disk, as it is where the main boot files and the Windows operating system are located. Therefore, if there are problems with this volume, normal booting of the computer is not possible. This article will show how to deal with this kind of error.

Reasons for an “unmountable boot volume” error in Windows

The reasons for why this happens are quite serious, since they concern system processes:

  1. 1. Most often, you can get this error due to corrupted system files. This can occur due to sudden system crashes, power surges, virus attacks, or malware corrupting these files.
  1. 2. Incorrect BIOS settings can also cause this problem.
  1. 3. If you recently updated your OS, it may be that the update itself caused the failure.
  1. 4. Damaged RAM or a faulty hard drive can also be the culprit.

To repair an “unmountable boot volume” error, consider the following options.

Method 1. Restart the computer

Always start with the easy way to solve a problem: just restart your system. Sometimes, especially for Windows 10, single system crashes occur, which can be automatically corrected after a simple reboot.

If this does not help, you can proceed to a more advanced solution to the problem.

Method 2. Use bootrec

If there are problems with the boot record, you can simply restore it. This requires an installation disk. Once booted from the installation disk, go to the "Repair your computer" section. In the new dialog box, click on "Troubleshoot" and in the list of advanced options, select "Command Prompt." Provided you have administrator rights, enter these commands (press Enter after each one):

bootrec /fixmbr

bootrec /fixboot

bootrec /rebuildbcd


After exiting Command Prompt, you can reboot in the usual way and the “unmountable boot volume” error in Windows 10 will not bother you in the future.

Method 3. Troubleshoot with Automatic Repair

You can also use the Automatic Repair utility by booting from the installation disk. Once booted, select the "Troubleshoot" section from the "Repair your computer" menu. Then click on Advanced Options and select the "Startup Repair" option. Follow the Wizard’s instructions and complete the recovery. After that, remove the boot disk and start the system in the usual way.

Method 4. Try SFC

The System File Checker (SFC) is also a great solution to problems with the boot volume. Boot from the installation disk again and select System Restore. In the Troubleshooting section, select Command Prompt with administrator rights. Then enter the command sfc / scannow. Press Enter and then just wait for the verification to complete. You will see the results of this action on the screen. If everything went well, just reboot the system.

Method 5. Use CHKDSK, but be careful!

Another good option is to use CHKDSK, which almost always works for this kind of problem. Be careful, however: you need to take care of the safety of the data on your computer before you use it. CHKDSK always damages all files beyond repair. Therefore, first restore the data and then proceed to use CHKDSK.

File recovery should begin by downloading and installing DiskInternals Partition Recovery. The application recovers files of all formats: pictures, music, documents, photos, videos, etc. There are no restrictions on the size of the recovered data; the application handles it just as well. If your file system is damaged, the program will automatically convert it and extract all possible information. Each disk partition will be checked separately for a better result. This application is as convenient as possible, since nothing is required from you; Partition Recovery does everything automatically. After viewing the files, you can decide whether to buy a license and thus enable data export.

After that, you can run CHKDSK, again using the installation disk. The command line is in the Troubleshooting section. Then, in a new window enter the command chkdsk / r and press Enter or OK. After checking, restart your computer; the problem should no longer bother you.

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