ErrorFindly
0x000000EDBSODCritical

0x000000ED — Unmountable Boot Volume | Blue Screen Fix Guide

UNMOUNTABLE_BOOT_VOLUME

Windows 10Windows 11

What Does 0x000000ED Mean?

Windows was unable to mount the boot volume. The file system on the boot drive could not be accessed.

Real-World Causes

  1. 1Corrupted boot volume file system
  2. 2Failing boot drive
  3. 3Changed SATA mode in BIOS
  4. 4Corrupted NTFS on boot drive
  5. 5Bad disk sectors on system partition

Symptoms

  • ⚠Blue screen with stop code UNMOUNTABLE_BOOT_VOLUME
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Use Windows Recovery Environment
  3. 3Run Startup Repair
  4. 4Rebuild BCD with bootrec commands

Advanced Fix

For experienced users and IT professionals

  1. 1Rebuild BCD store manually
  2. 2Use bcdedit to verify boot configuration
  3. 3Repair Master Boot Record with bootrec /fixmbr
  4. 4Reinstall Windows if boot files are corrupted

Frequently Asked Questions

What causes UNMOUNTABLE_BOOT_VOLUME?
Windows was unable to mount the boot volume. The file system on the boot drive could not be accessed.
Can I fix Unmountable Boot Volume myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x0000007BInaccessible Boot Device0x00000024NTFS File System

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.