You may come across an UNMOUNTABLE_BOOT_VOLUME Blue Screen of Death error when you power on your Windows 10 computer. It blocks you away from your files and data. To fix this problem, you can try the methods as follows.
(Note that you will need a Windows 10 DVD or a bootable USB drive before you proceed. If you have neither of them, you can burn a Windows 10 ISO file to an available USB drive using another computer.
Once you have your Windows 10 media prepared, put it into your computer and boot your computer from it. If you don’t know how to do it, please check How to Boot from a USB Drive, DVD or CD.
Then you can try any of the methods listed below.)
Using Automatic Repair is the easiest way to fix problem of this kind.
a) On the Windows Setup screen, after you finish choosing your language, click on Repair your computer at the bottom left.
b) Click on Troubleshoot on the next screen.
c) Click on Startup Repair on the Advanced options screen.
d) Select Windows 10.
e) The repair will be started immediately. Please wait patiently for the process to be finished.
Master Boot Record (MBR) identifies where and how your operating system is located so that you can boot your computer normally. A malfunctioning MBR can cause problems such as UNMOUNTABLE_BOOT_VOLUME.
a) Repeat the steps in method 1 until you see the screen of Advanced options.
b) Select Command Prompt.
c) Type “bootrec /fixboot“ in Command Prompt, and then hit Enter.
d) Wait for completion of the process, and then restart your computer to see if the error message shows up.
UNMOUNTABLE_BOOT_VOLUME error can be caused by problems on your hard drive. You can run Chkdsk command to check up and fix these problems.
a) Open Command Prompt on your Windows 10 media as the steps above show.
b) Type in “chkdsk /r c:“(Note that “c:” here refers to your boot drive and replace this with the letter you use in case your boot drive is not C Drive) and hit Enter.
c) Wait for completion of the process, and then restart your computer to see if it runs normally.
If you try all methods above and you still get the UNMOUNTABLE_BOOT_VOLUME blue screen error, you should consider reinstalling Windows 10.
a) On the Windows Setup screen, after you finish choosing your language, click on Install now.
b) Follow the instruction following to complete the process of reinstallation.
If the methods above are not helpful for solving your UNMOUNTABLE BOOT VOLUME Windows 10 Blue Screen error, it may be caused by issues on your hardware devices. You may consult a computer expert or contact your device manufacturers for further assistance.