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

Roxanne updated on Jan 22, 2021 to Data Recovery | How-to Articles

Get unmountable boot volume error on HP, Lenovo, Dell, and Toshiba laptop? Here are solutions to get the problem fixed in Windows 10/8/7/XP with or without a Windows installation CD/disk. If data recovery is needed, download EaseUS bootable recovery software to get back wanted data.

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.

Step 1. Open EaseUS Partition Master on your computer. Then locate the disk, right-click the partition you want to check, and choose "Check File System".

Check Partition - Step 1

Step 2. In the Check File System window, keep the "Try to fix errors if found" option selected and click "Start".

Check Partition - Step 2

Step 3. The software will begin checking your partition file system on your disk. When it has completed, click "Finish".

Check Partition - Step 3

Fix 2. Fix MBR (Master Boot Record)

  • Right-click the boot disk and select "Rebuild MBR" option.
  • Select the type of MBR with the current operating system. Then, click "OK".
  • Click the "Execute 1 Operation" button at the top-left corner and click "Apply" to build the MBR. After that, your computer can boot normally again.
Repair MBR to Fix Unmountable Boot Volume Without CD
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

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. 

Step 1. Choose a location to scan.

Make sure that all hard drives and other devices were correctly connected and recognized by the software. Refresh an external device if necessary. From which drive was data lost? Choose the relevant hard drive partition by left-clicking on it. Click the Scan button.

select a location and click scan

Step 2. Wait for the scanning results.

It takes a while for EaseUS Data Recovery Wizard to complete the scan, all depending on how much disk space is used on the selected hard drive. As you see, the "Deleted files" result would come our first, later it's all lost data result. You can try to recover lost data as soon as it shows up even though the scanning process has not finished yet.

scan the disk

Step 3. Preview the result and recover data.

Preview and choose the files you want, click "Recover" button to save them to a safe place. You'd better choose a different drive to avoid data overwriting.

recover data from the disk


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.

Was This Page Helpful?


Frequently Asked Questions

1. Why choose EaseUS Data Recovery Wizard?

"EaseUS Data Recovery Wizard is the best we've seen. It's far from perfect, partly because today's advanced disk technology makes data-recovery more difficult than it was with the simpler technology of the past, but it's fast and efficient..."PCMag

"The first thing you'll notice about EaseUS Data Recovery Wizard Pro is that its interface is very clear and uncluttered, with only a small collection of self-explanatory controls. You won't find lots of extra options hidden in a system of hidden menus, either; what you see really is what you get."techradar

"Recover lost files, even after deleting a partition or formatting your drive."Macworld

2. Why cannot I recover 2GB data for free?

It is recommended to check the version installed is Free or Trial because they are different versions.

Trial has data preview function but cannot save any files, while the Free version enables to recover 2 GB files. The default free space is 500 MB and you may share the product on social media to get another 1.5 GB.

3. Why cannot the recovered files be opened?

A file is saved as 2 parts on the storage device: directory info (which is comprised by file name, time stamp and size info, etc.) and data content.

If the files with original file names and folder structures cannot be opened, one possible reason is the corrupted directory info. There is still a chance to recover the data content with the RAW Recovery method in our software.

4. Why isn't it suggested to recover the files back to the original drive?

The storage structure of the lost files would be altered or damaged by any changes on the drive. If you save the recovered files back to the same drive, the original data structures and data content would be corrupted or overwritten, which causes permanent data loss. So you should prepare another disk to save the files.

5. How can I check whether my data is recoverable or not before purchase?

The Free version helps you save 2GB files, so verify the recovery quality of our product before purchase.

6. How long does it take to scan the drive?

It strongly depends on the capacity of your hard drive and the performance of your computer. As reference,most drive recoveries can be completed in around 10 to 12 hours for a 1-TB healthy hard drive in general conditions.

About Data Recovery Wizard

It's super easy to recover 250+ types of files after deletion, disk formatting and virus infection. Click the links and compare the difference of each version.