How to Fix Unmountable Boot Volume

Abby Haines updated on Aug 12, 2019 to Data Recovery | How-to Articles


Get unmountable boot volume error on HP, Lenovo, Dell and Toshiba laptop? Here are troubleshooting guides show you how 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 check if it helps.

Sometimes, users can be prevented from accessing Windows operating system and boot their PC because of 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 usually caused by several reasons including corrupted system files, disk errors and damaged boot volume. Next, you can learn troubleshooting guide 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 retrieve them back, you can directly skip to part 3 to learn how to recover data from the PC that cannot boot.

Part 1. Fix Unmountable Boot Volume Without CD
Part 2. Fix Unmountable Boot Volume Using Windows Installation CD/Disk
Part 3. Recover Data When Unmountable Boot Volume Error Attacks

Part 1. Fix Unmountable Boot Volume Without CD

If you don't have a Windows installation CD/disk, please first download EaseUS partition software 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, please first 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 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.

Check and Repair Boot Drive Errors to Fix Unmountable Boot Volume Without CD

Fix 2. Fix MBR (Master Boot Record)

Right-click the boot disk and select Rebuild MBR option, then click Apply to start the repair process.

Repair MBR to Fix Unmountable Boot Volume Without CD

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 unmountable boot volume problem. Before starting, please first boot your PC from the bootable CD or USB device and then select "Repair Your Computer" option in Windows Setup window to get into "Choose an option" menu.

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

Fix 1. Run Automatic Repair

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

1) In the menu, click Troubleshoot > Advanced Options > Command Prompt.
2) In the command line, type sfc /scannow and press Enter button. 
3) Restart your computer when the process is finished.

Fix 3. Run CHKDSK to Repair Boot Drive

1) Open Command Prompt using the steps with fix 2, type chkdsk /r c: and press Enter. 
2) Type Y and hit Enter when you are prompted to schedule the check after a reboot. 
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. 

bootrec /rebuildbcd
bootrec /fixmbr
bootrec /fixboot

Part 3. Recover Data When Unmountable Boot Volume Error Attacks

1. Download EaseUS Data Recovery Wizard WinPE Edition and create a bootable disk on a working computer.
2. Go to BIOS, change the boot sequence of the computer that reports unmountable boot volume error.
3. Restart the computer and run EaseUS Data Recovery Wizard from the WinPE bootable disk.
4. Select the disk you want to scan to find all your lost or existing files.
5. After scanning, filter and preview all the listed data by file types, and then selectively recover those files you want. Here you should save all the recovered files on a different drive or memory card in case of data recovery failure.

recover data with easeus

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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 to better 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.

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