Windows 10 Unmountable Boot Volume Error Message And Automatic Repair

Hi, I seem to be having an issue during start-up.

First: My Desktop PC was powered off for about 16 hours, and when I 

had shut it down, it shut down normally at that time.

Second: When I turned on my PC, the Windows 10 logo screen appeared

as it would normally do, but the circle of dots remained on for an

extended period of time, and then a blue screen appeared saying

that "Your PC ran into a problem, and needs to restart". At the bottom

of that screen a stop code had said "UNMOUNTABLE BOOT VOLUME".

Then the PC rebooted with the Windows 10 logo screen and the

circle of dots with a message saying "Preparing Automatic Repair".

Third: After that screen disappeared, what looked like a Command

Prompt window briefly flashed onto the screen, and then I had seen

nothing but a black screen.

What I would like to know is 1). In general how long should the

Automatic Repair mode be running, And 2). What is causing the

Unmountable Boot Volume. 

It has been suggested by reading some of the posts within

the community, that my HD may be at fault, is this true?

For point of reference, I have a HP All In One Desktop PC

that was purchased in early 2011 with Win 7 installed.

And except for an issue with the optical disc drive

(CD-R, CD-RW, DVD, Blu-Ray) that occurred in late 2015,

the PC has been functioning normally.

And also for point of reference.

Just before the expiration date for the free upgrade to

Win 10, I had installed Win 10 on my PC, and it has also

been functioning normally, as also with the recent

Win 10 Creators Update that was installed in Mid-June of

this year.

If anyone within the community can tell me what is going

wrong with my PC, it would be very helpful, and greatly

appreciated.

Thanks in advance. 

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Answer
Answer

Hello Smiley,


The "Unmountable Boot Volume" error message occurs due to a variety of reasons. It can be due to a damaged file system and cannot be mounted, or the basic input/output system (BIOS) settings are configured to force the faster UDMA modes. It can also occur if there is a problem in the system hard drive or in the partition where your Windows is installed. It doesn't necessarily mean that your hard disk is defective.

The Automatic Repair should only take you for about 15 minutes max.

Since you've mentioned that you can't reach your lock screen to be able to log in and proceed to troubleshoot your PC, let's create an installation media and perform some troubleshooting steps using that tool.

You can download the installation media tool from this link. Don't worry as the steps on how to download it can be found on the link.

After successfully downloading it, you can proceed to these troubleshooting methods. Make sure that you start your PC using the installation media.

Method 1 - Perform a Chkdsk.

  1. Select the Repair your computer option found at the lower-left corner once you start your PC using the installation media.
  2. Choose Command Prompt.
  3. Type chkdsk /r c:, then press the Enter key from the keyboard. Note: Replace c: to the bootable drive letter you're using if it's other than c:.
  4. Select Y for Yes if you were asked regarding checking the disk the next time the system restarts.
  5. Reboot your PC. Let's keep our patience here as the chkdsk can take quiet some time.

Method 2 - Repair Master Boot Record.

  1. Select the Repair your computer option found at the lower-left corner once you start your PC using the installation media.
  2. Choose Command Prompt.
  3. Type bootrec /fixboot, then press the Enter key from the keyboard.
  4. Reboot your PC. Your patience is also needed here.

Method 3 - Automatic Repair

  1. Select the Repair your computer option found at the lower-left corner once you start your PC using the installation media.
  2. Choose Troubleshoot, then Advanced options.
  3. Select Automatic repair, then Next.

If these methods didn't work to repair your PC, then you seem to have a bad hard drive that might need a replacement. That being said, you can check it with your manufacturer if you reach this point.

We'll be waiting for your update.


Best.

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Last updated July 29, 2021 Views 80,765 Applies to: