Unmountable Boot Volume (STOP: 0x000000ED): How to Fix


The unmountable boot volume error is a Blue Screen Of Death (BSOD) error that is shown along with a Stop Code 0x000000ED. This error completely restricts you from using Windows and locks you out of your data and files. The error may be caused by many reasons. Even though there is no known particular cause for this error but there are speculations that it may be due to a corrupted registry file, a damaged hard disk , bad sectors in system memory, sometimes a damaged RAM.

Many users have reported experiencing this error mostly while updating their Windows or at the time of the installation of updates. However, this error can occur out of nowhere, entirely without any prompt even when you have not made any changes to your system. The main problem posed by this error is that you will be locked out of your system and cannot access any of the necessary files and data that you have saved on your computer. If you are facing any of these problems, don’t worry because here we bring you the best and proven solution to this error.

How to Fix Unmountable Boot Volume (STOP: 0x000000ED)

We suggest that you go through the entire article before attempting any of the methods. A Windows 10 bootable installation DVD or CD is a vital necessity for the repair methods mentioned below, so we highly recommend getting one before you can try any of these methods.

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Method 1: Run Startup/Automatic Repair

1. Firstly, insert the Windows 10 Bootable Installation Disk and then restart your computer.

2. When your computer boots, you will be prompted to press any key to boot from the Disk. Press any key to go on forward.

3. Then, you can select your preferred language, then click Next.

select language and click next
select language and click next

4. Click on Repair Your computer option on the bottom left side.

Repair Your Computer
Repair Your Computer

5. Next, on the Choose an option screen, click on Troubleshoot option.

Select Troubleshoot
Select Troubleshoot

6. When the troubleshoot screen opens, Click on the Advanced Option.

Advanced Options
Advanced Options

7. Then, on the Advanced options screen, select Automatic Repair or the Startup Repair.

Automatic Repair
Automatic Repair

8. The repair process will take some time to complete, wait for Automatic/ Startup repair to complete.

9. After the repair is completed, Restart your computer, and you should have fixed the unmountable boot volume Windows 10 error successfully.

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Method 2: Run System File Checker (SFC) and Check Disk (CHKDSK)

1. Follow the same steps as of Method 1 to go to the Command prompt. To open the command prompt, click on command prompt in the Advanced options screen.

2. Next, in the command prompt window, type in the following commands, then hit enter after each one.

sfc /scannow /offbootdir=c:\ /offwindir=c:\windows
chkdsk c: /r


Note: Here we have mentioned drive C, because Windows is installed in C. While doing this method, make sure to use the letter of the drive where your Windows is installed.

3. After you have executed the commands, exit the Command Prompt window.

4. Restart your computer and check whether the Windows 10/7 unmountable boot volume error is resolved or not.

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Method 3: Repair your Boot Sector or Rebuild BCD

1. Using the same method as of Method 2, open the command prompt from the bootable Windows installation Disk.

2. Then, in the command prompt window, type in the following commands, and hit enter after each one of the commands.

bootrec.exe /FixMbr
bootrec.exe /FixBoot
bootrec.exe /RebuildBcd


3. If there aren’t many results with the first set of commands or they fail, use the following set of commands in the command prompt window to resolve the error.

bcdedit /export C:\BCD_Backup
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old
bootrec /RebuildBcd
bcdedit backup then rebuild bcd bootrec

4. After you have successfully entered the commands, exit the command prompt window.

5. Then, restart your computer and check whether the unmountable boot volume error is resolved or not.

Method 4: Change your SATA Configuration

  1. Firstly, turn off your PC, then turn it on and while your computer boots, press F2, DEL key, or F12(Depending on your computer’s manufacturer) along with the booting process. It will enter you into your computer’s BIOS setup.
  2. In the BIOS setup, look for a setting named the SATA Configuration.
  3. Find the option, and then click on “Configure SATA as” option and change the configuration to AHCI mode.
    Configure SATA as
    Configure SATA as
  4. Then, lastly press on F10 to save the changes you have made and exit BIOS setup.

Method 5: Set the Correct Partition as Active

1. Again use the same steps as of Method 2 to go to the Command Prompt and then type in: diskpart

2. And when the command is processed, type in these commands in Diskpart:

DISKPART> select disk 1
DISKPART> select partition 1
DISKPART> active

Note: Always make sure that you mark the System Reserved Partition (generally 100mb) as active, and in case you do not have the System Reserved Partition then you can mark C: Drive as the active partition.

3. After the command processes are complete, exit command prompt and then restart your computer to check if unmountable boot volume has been fixed.

Method 6: Run Memtest86+ 

Memtest86+ is a 3rd party software that can be trusted very much to eliminate all the possible exceptions that may be caused by memory errors. It is possible with this software because it runs outside of the Windows Environment.

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Note: Before starting, we strongly recommend that you must have access to another computer to complete this method as you will need a computer to download and burn the software to a Disk or USB drive. Also, the best way we suggest is to leave your computer overnight while running Memtest86+ as it will take some time to complete.

Running Memtest86+ Tool on your PC

  1. Firstly, on the computer that is working. connect a USB flash drive.
  2. Then, download the Memtest86+ Auto Installer for USB key from the website and install it. http://memtest.org/download/5.01/memtest86+-5.01.usb.installer.zip
  3. To extract the downloaded zip file, right-click on the file that you have just downloaded and then select the “Extract here” option.
  4. Once you have extracted the file, open the folder in which the file has extracted and then run the executable Memtest86+ file.
  5. Choose the USB drive which you have plugged into the computer; this will burn Memtest software into the USB Flash Drive. (Please note that burning the software into the USB Drive will format your USB drive).
  6. Once the burning process is completed, insert the USB into the computer that is showing the Unmountable Boot Volume error.
  7. Then when booting the computer, make sure to select boot from the USB Flash Drive.
  8. After your computer boots, Memtest86+ will start to test for memory corruption issues in your system.
  9. If all the Memtest86 tests passed, then you can be sure that the memory of your system is working correctly.
  10. In case some of the tests in the Memtest86 were unsuccessful, then Memtest will find the memory corruption in your system. Then you can be sure that a bad/corrupt memory causes the unmountable boot volume (BSOD) error.
  11. So if there are any bad memory sector, replacing your RAM is the best solution to fix the error.

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Final Verdict

These are the best methods out there that can help you to resolve the unmountable boot volume BSOD error in Windows 10. We strongly recommend that you go through all the steps thoroughly before attempting any of the methods as these are critical tasks and any minor mistake can mean complete damage to your system. But when done correctly, these methods can resolve the problems you are facing with your computer.