6 Solutions to Fix Unmountable Boot Volume Windows 10/8/7

Updated by Brithny on Sep 22, 2022
Written by Roxanne
  | Computer Instruction

Quick Navigation to Unmountable Boot Volume Fixes:

Workable Solutions Step-by-step Troubleshooting
Fix 1. Repair Drive Errors Open EaseUS Partition Master on your computer. Then locate the disk, right-click the partition...Full steps
Fix 2. Rebuild MBR Right-click the boot disk and select "Rebuild MBR" option. Select the type of MBR...Full steps
Fix 3. Run Automatic Repair In the menu, choose "Troubleshoot > Advanced Options > Startup Repair"...Full steps
Fix 4. Use SFC In the menu, click "Troubleshoot > Advanced Options > Command Prompt"...Full steps
Fix 5. Run CHKDSK Open Command Prompt using the steps with Fix 2, type chkdsk /r c: and...Full steps
Fix 6. Fix MBR Try every USB port available; Determine you're using USB 2.0 or 3.0...Full steps

Before you are going to try the solutions in this post, follow the GUARANTEED SOLUTIONS in this video (from EaseUS):

  1. 1 - Fix system file error and boot error using Windows installation disc.
  2. 2 - Fix BCD error. BCD error always cases system boot issue, Bcdedit command is able to fix the most of BCD error to make computer bootable. 
  3. 3 - Uninstall software or driver in safe mode to fix BSOD. If you still want to learn some more fixes in this post, read on. 

Overview of Unmountable Boot Volume Issue

Sometimes, users can be prevented from accessing the Windows operating system and boot their PC because of the Blue Screen of Death error. Caught by this problem, they will usually be told "Your PC ran into a problem and needs to restart" and some other detailed information which is helpful to find what caused the error and how to get it fixed. UNMOUNTABLE_BOOT_VOLUME is a popular error detailed information that usually appears on HP, Lenovo, Dell and Toshiba laptop in Windows 10/8/7/XP. 

unmountable boot volume error

According to professional technicians, we know that unmountable boot volume error is caused by the following reasons:

  • Corrupted system files
  • Disk errors
  • Damaged boot volume
  • Damaged RAM and more...

Many reasons could lead to this error in addition to the reasons above. Next, you can learn fixes for each reason, no matter you have a Windows installation CD/disk or not. If you have important files saved on the PC and are extremely urgent to get them back, you can directly skip to Part3 to learn how to recover data from the PC that cannot boot.

Part 1. Fix Unmountable Boot Volume Without CD

If you don't have a Windows installation CD/disk, download EaseUS partition software first and use it to create a USB bootable disk, and then try the following two fixes to deal with unmountable boot volume error. Before starting, change the boot sequence of the unbootable PC in BIOS, and then restart the computer from the WinPE bootable disk. It will guide you to the main window of EaseUS partition software.

Fix 1. Check and Repair Boot Drive Errors

Right-click the boot drive and click the "Check partition" option, then choose the way that you want to use to check the hard drive and click "OK". The software will automatically scan hard disk partition and repair errors for you. Finally, click "OK" to finish the process.

Fix 2. Fix MBR (Master Boot Record)

Step 1. Create a WinPE bootable disk

  • Launch EaseUS Partition Master, and click "Bootable Media" on the toolbar. Select "Create bootable media".
  • Click "Next" to finish the process.
create a bootable disk

Step 2. Boot EaseUS Partition Master Bootable USB

  • Connect the bootable USB or CD/DVD to your PC. 
  • Press F2 or Del when you restart the computer to enter the BIOS screen. Set and boot your computer from "Removable Devices" or "CD-ROM Drive". And then EaseUS Partition Master will run automatically.

Step 3. Rebuild MBR

  • Click "Toolkit" and choose "Rebuild MBR".

rebuild MBR

  • Select the disk and the type of MBR. Then, click "Rebuild".
rebuild MBR
  • After that, you can see "MBR has been successfully rebuilt on Disk X".
rebuild MBR

Do You Need Specialized Services for System Boot Issues?
EaseUS also provides 1-on-1 remote assistance to fix the boot issue. If the solution above does not work for you, please contact our professionals via Email or LiveChat in this page. To ensure our professional assistance work, you are suggested to connect the unbootable system drive to a healthy computer when getting connected with us.

Part 2. Fix Unmountable Boot Volume Using Windows Installation CD/Disk

If you don't want to use third-party software, you can create a Windows installation CD/disk to solve the unmountable boot volume problem. Before starting, please first boot your PC from the bootable CD or USB device and then select the "Repair Your Computer" option in the Windows Setup window to get into the "Choose an option" menu.

Go to Windows Boot Options menu to fix unmountable boot volume error

Fix 1. Run Automatic Repair

Step 1. In the menu, choose "Troubleshoot > Advanced Options > Startup Repair".

select startup repair

Step 2. Next, select the target operating system to fix. Windows will initiate the repair and then restart.

Fix 2. Use SFC /SCANNOW to Repair System Files

Step 1. In the menu, click "Troubleshoot > Advanced Options > Command Prompt".

select command prompt

Step 2. In the command line, type sfc /scannow and press Enter button. 

use sfc scannow to repair system files

Step 3. Restart your computer when the process is finished.

Fix 3. Run CHKDSK to Repair Boot Drive

Step 1. Open Command Prompt using the steps with Fix 2, type chkdsk /r c: and press "Enter". 

Step 2. Type Y and hit "Enter" when you are prompted to schedule the check after a reboot. 

Step 3. Reboot and let the check proceed. It might take a while.

Fix 4. Fix MBR

Open Command Prompt, type the following commands and press Enter after each move. 

lbootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
exit

Fix mbr using cmd

Part 3. Recover Data When Unmountable Boot Volume Error Attacks

As I have mentioned above, if you have important files saved on the PC and are extremely urgent to retrieve them, you can directly learn how to recover data from the PC that cannot boot. All you need is EaseUS Data Recovery Wizard Pro with Bootable Media. It is mainly designed for data recovery cases of any system crash or booting problems. Try it to rescue your files when the hard disk is dead, damaged or failed. 

 Download for Win Recovery Rate 99.7%
 Download for Mac Trustpilot Rating 4.6

Step 1. Launch EaseUS Data Recovery Wizard in Windows 11/10/8/7 and choose the place where you lost data. Then, click "Scan".

select a location to scan

Step 2. After the scan, use the file format filter on the left or upper right corner to find the files you need. Then, you can click the "Preview" button or double-click a file to preview its content.

Choose files to recover

Step 3. Click the checkbox next to the file and click "Recover" to get back the lost data to a secure place.

Recover lost data

Conclusion

You have learned 6 effective ways to solve the unmountable boot volume issue. You can try any one of them to fix unmountable boot volume Windows 10. Also, the video on the top can solve the common blue screen errors effectively, you can follow the details in the video. If you have any better solution to solve unmountable boot volume, you can share it and tell us.

Unmountable Bootable Volume (People Also Ask)

There are some FAQs about unmountable bootable volume:

1. What is the boot volume?

The boot volume refers to the disk volume that contains the Windows operating system files and the supporting files.

2. What causes unmountable boot volume?

  1. Corrupted system files
  2. Disk errors
  3. Damaged boot volume
  4. Damaged RAM and more...

3. How do I fix unmountable boot volume?

  1. 1. Check and Repair Boot Drive Errors
  2. 2. Fix MBR (Master Boot Record)
  3. 3. Run Automatic Repair
  4. 4. Use SFC /SCANNOW to Repair System Files
  5. 5. Run CHKDSK to Repair Boot Drive
  6. 6. Fix MBR

4. How do I boot from a USB drive in Windows 10?

  1. 1. Create an emergency disk with EaseUS partition software.
  2. 2. Connect the bootable USB drive to a USB port on your PC. Turn on or restart your PC.
  3. 3. Press F2, Del or F8 to change your computer boot sequence in BIOS. Set to boot the PC from Removable Devices or CD-ROM Drive beyond Hard Drive. Press F10 to save and exit.

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