How to Fix UNMOUNTABLE_BOOT_VOLUME BSOD on 10

It might sound astonishing but Microsoft declared its statistics regarding the number of Windows 10 activations in the first month after its release, to be 75 Millions. Keeping aside the popularity of Windows, users are facing a bunch of issues with their Windows. One of these major issues is an error “Unmountable Boot Volume” with BSOD that most probably appears right after updating the Windows to the latest version. This error message prevents a computer from booting into Windows. Hence, it doesn’t let you boot into Windows that becomes more fatal when you don’t know how to resolve it.

What are the Causes of this Problem?

1. As the error message states, it can occur due to failure of Windows in reading the hard drive In this scenario, your hard drive might be damaged or it might have some bad sectors that affect its read/write capability.
2. A virus / malware can also corrupt your Windows Files. So, Windows cannot load itself because it can’t find the particular files.
3. If you have an old computer and you are trying to update your OS to the latest version, then in some cases, your PC might come up with this error.

What are the Solutions to Fix Unmountable Boot Volume Error?

As this error doesn’t let you boot into Windows, you might need a bootable USB drive in order to access your computer. For this purpose, you need a USB flash drive with a capacity of atleast 4GB, a Windows ISO file and another computer to make the USB drive bootable. If you don’t know how to make a bootable USB, we have setup an easy to follow guide for you. Click this link and follow the steps.

Method 1: Fixing the Error using Automatic Repair

After you have setup a bootable USB flash drive, you can follow this method to let the Windows automatically resolve this problem.

1. Plugin the bootable USB you created earlier and restart your PC. Wait for the moment when your computer starts to boot up. Immediately press the function key specified by your manufacturer in order to enter the BIOS. Different manufacturers have different keys setup for this purpose. In a majority of cases, F8, F9, F12 or Del might let you enter the BIOS. Select boot from USB option inside BIOS and boot from your bootable USB flash drive.

2. Inside Windows Setup screen, click on Repair your computer link at the bottom left.
3. On the next screen where you see Metro style icons, select the Troubleshoot
4. On the Troubleshoot screen, you are required to click the Advanced options and then Automatic Repair/ Startup Repair. Wait for the process to complete as it might take a long time depending on the intensity of problem and your hard drive condition.

Method 2: Fixing/ Repairing Master Boot Record (MBR):

MBR is a type of information stored inside the first sector of a hard drive. It indentifies the location of the Operating System on the hard drive that helps to load it inside a computer’s main memory (RAM). By fixing the Master Boot Record, you can get rid of the unmountable Boot Volume error.

1. Navigate to the Advanced Options screen by following the steps from 1 to 4 of Method # 1.
2. Inside Advanced Options, click on Command Prompt to option the Windows own command-line console.
3. Inside the Command prompt, type the following commands one by one followed by the Enter

bootrec /RebuildBcd

bootrec /fixMbr

bootrec /fixboot

Type Exit after the above mentioned commands are executed. Restart your computer afterwards.

Method 3: Fixing Using “chkdsk” Command

Chkdsk is a command used to find any problem associated with the external hard drive. If any of the above mentioned method is not working for you, then you should give it a try.

1. Open the Command Prompt again as mentioned in the Method # 2. Type the following command followed by the Enter key.

chkdsk /r c:

Type Y when asked and hit Enter again to let it execute the process.

Note: If your Windows partition is other than “C”, then replace the letter “c” in above command with your relevant one.

2. Let it check the errors and when finished, restart your computer to see if it is resolved.

Method 4: Fixing by Running SFC Scan

This might be final option before reinstalling your Windows if above mentioned methods don’t solve your problem. All you need to do is to run System File Checker Scan that checks and resolves any corrupted files. We also have a dedicated guide to run this scan inside Windows. Click this link and follow the steps accordingly.

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