Summary: This blog discusses the top methods to fix the ‘un-mountable boot volume’ issue in Windows 10. It also explores the causes of this error and how to recover data from the affected boot volume with Stellar Data Recovery Professional software. Get it now!
I installed a new solid state 1tb hard drive. Worked a bit slow but I thought it was just bedding in. System tools showed the drive as fragmented, which I thought was odd as it was a new hard drive. However, I thought it might’ve been related to the cloning process so I defragged it. Next day, perhaps unrelated, I got the above error. Do I reset via the Windows 10 auto recovery screen or do a fresh install using a bootable USB? I don’t want any data to get deleted though. Please help.
Unmountable Boot Volume Error in Windows 10 generally occurs when the BIOS (basic input/output system) settings are configured to speed up the UDMA mode (method to transfer data between the computer and an ATA device through the ATA controller). This error may also occur due to a damaged file system, which can’t be mounted, or problem in the system hard drive/partition where the Windows OS is installed.
However, you can fix this issue with the help of the following troubleshooting methods:
Note: Before performing any troubleshooting methods, you must have a backup of your data. Some methods may lead to data loss. In case you end up losing data while trying to fix the ‘Un-mountable Boot Volume’ error, use a Professional Windows Data Recovery software to recover your data.
To fix the un-mountable boot volume issue in Windows 10, you may follow the given methods in this blog. However, those methods can lead you to permanent data loss, if not carried out properly. Hence, your first approach should be towards recovering your data from an un-mountable boot volume using a powerful data recovery software such as Stellar Data Recovery Professional. This Do-it-Yourself (DIY) software has a bootable recovery drive option using which you may access your data even from an unbootable or crashed PC.
Create a bootable recovery drive by following the given steps to recover your data:
When done with creating a bootable recovery drive, follow the steps given below to access your data and create backup.
1. Connect the USB (bootable recovery drive) to the affected Windows 10 PC.
2. Power on your system while pressing the Boot option (usually F12).
3. Select the USB drive from the available options.
4. The ‘Select What to Recover’ interface will appear on the system screen.
5. Select ‘Everything’ or choose specific file types, and click Next.
6. Select the drive/volume from which you want to retrieve data.
7. Click Scan. Select the files you want to create a backup for and click Recover.
8. Browse and select the external drive to save your data.
9. Click Start Saving and wait till the process is completed.
Now that you have recovered your data and created adequate back-up, you can proceed with the following methods to fix unmountable boot volume error.
Method 1: Perform a CHKDSK
As you can’t boot Windows normally, you will have to create a Windows 10 installation media on a USB with Windows Media Creation Tool. It will help you boot the system from the USB drive and access the troubleshooting options/tools. After creating a Windows installer, try to boot your system with it, and follow the given steps:
Once the process is completed, reboot your system to check if the issue has been fixed.
Method 2: Windows Automatic Repair
If the error doesn’t get fixed with CHKDSK command, try fixing it with Windows Automatic Repair:
Reboot your system once the repairing process is completed.
Method 3: Repair/Rebuild Master Boot Record
You can try fixing this error by rebuilding or repairing the MBR (Master Boot Record). To perform this method, you will have to power on your system with the same Windows 10 Installation Media and follow the steps mentioned above to reach the Advanced Options window.
Let the process be completed. Once it is done, exit the Command Prompt, and reboot your PC.
Method 4. Reinstall Windows 10
If all methods fail to fix the unmountable boot volume issue in Windows 10, you’re only left with the option of reinstalling Windows. Use the Windows 10 Installation Media to reinstall the Windows. This may fix the error but will format your system boot volume/drives/partitions resulting in permanent data loss.
This error may occur anytime. Performing the aforesaid troubleshooting methods to fix the unmountable boot volume issue in Windows 10, may lead to permanent data loss. Hence, before fixing this error, you must recover your important data with the best Windows Data Recovery software i.e. Stellar Data Recovery Professional. The software has a bootable recovery drive feature, which lets you access data even from an unmountable boot volume or a crashed PC. After recovering your data and creating the backup, you may proceed with fixing the unmountable boot volume issue in Windows 10 and get your system back in working condition.
Mansi Verma is a Technology Writer at Stellar®. She is a Tech enthusiast, holding over 7 years of experience in Data Recovery, IoT, Artificial Intelligence, and the Robotics technology domain. She loves researching and providing DIY solutions and tips & tricks to solve Windows technical issues. In her spare time, she likes reading novels, and poetry. She also enjoys traveling and trekking.