by Ugnius Kiguolis - -


Issue: How to Fix UNMOUNTABLE_BOOT_VOLUME BSOD on Windows?

Windows 10 returns a BSOD UNMOUNTABLE_BOOT_VOLUME during the boot phase. The system gets frozen and I cannot access my desktop. I cannot find relevant information about this bug, so I would highly appreciate your help!

Solved Answer

UNMOUNTABLE_BOOT_VOLUME is a Blue Screen of Death (BSOD) or Stop error, which may affect Windows 10, 8.1, and 8. It shows up on the Windows boot phase and prevents the system from booting successfully. The Unmountable_Boot_Volume error has a value 0x000000ED, so both the code and the technical name of the bug may be used interchangeably.

printscreen of the UNMOUNTABLE_BOOT_VOLUME stop error

The 0x000000ED error means that I/O sub-system on machine failed to mount the boot volume. BSOD errors typically emerge due to the corrupted boot configuration files, incorrect partition on multiple OS system,  SATA controller damage, or sometimes virus infections. In this case, the problem may also be related to the Solid State Drive or Hard Disk Drive. The culprit may be identified according to the conditions in which the UNMOUNTABLE_BOOT_VOLUME BSOD occurs. For example, Windows may be stroked during installation setup, Windows startup or in the middle of some important work. The following message with the blue screen background occurs:

Your PC ran into a problem and needs to restart. We’re just collecting some error info, and then we’ll restart for you. (30% complete)
If you’d like to know more, you can search online later for this error: UNMOUNTABLE_BOOT_VOLUME


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If you have managed to boot up Windows successfully, you should run Startup Repair to prevent UNMOUNTABLE_BOOT_VOLUME error from reoccuring. For this purpose, perform these steps:

  • Remove all external drives (CD, DVD USB) from your PC.
  • Press Power button to reboot.
  • During the Windows boot, press and hold F8 key.
  • Using the arrow keys on your keyboard, navigate to the Repair your computer option and press Enter.
  • Select keyboard layout and click Next.
  • Select user name, type in the password, and press OK.
  • When the System Recovery Option menu shows up, select Startup Repair.
  • If necessary, reboot the system.

If, unfortunately, you your PC got stuck with the 0x000000ED BSOD during startup, prepare USB or DVD with the Windows 10 Installation Media. If you don't have the disc yet, you can create it by following the steps given on this page. For this purpose, you will have to have another PC running Windows OS. Once ready, plug in the bootable Windows 10 Installation Media and follow these steps:

  • Reboot the PC.
  • Press any key to boot from the installation media.
  • Select language, time, currency, and keyboard/input method and press Next.
  • Click Repair your computer (NOT Install Windows) and select the type of OS you want to repair.
  • Click Troubleshoot.
  • Select Advanced and click Automatic Repair or Startup Repair.
  • When the system detects the OS, select the one that is running on your PC.
  • Finally, unplug the USB or remove DVD bootable media and try to boot your device.

If the bug has reoccured and you cannnot boot Windows anyway, try these steps:

  • Click Power button and try to boot your PC.
  • Press F8 key repeatedly at boot and select Repair your computer.
  • Select Command Prompt and type the following commands.
  • Press Enter after each one and DO NOT remove the space before / symbol.

bootrec /fixMBR
bootrec /fixBoot
bootrec /rebuildBCD

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About the author

Ugnius Kiguolis
Ugnius Kiguolis - The problem solver

Ugnius Kiguolis is the founder and editor-in-chief of UGetFix. He is a professional security specialist and malware analyst who has been working in IT industry for over 20 years.

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