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0x00000072BSODCritical

0x00000072 — Assign Drive Letters Failed | Blue Screen Fix Guide

ASSIGN_DRIVE_LETTERS_FAILED

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000072 Mean?

The system failed to assign drive letters during initialization.

Real-World Causes

  1. 1Corrupted disk configuration
  2. 2Missing or damaged mount manager
  3. 3Registry corruption

Symptoms

  • ⚠Blue screen with stop code ASSIGN_DRIVE_LETTERS_FAILED
  • ⚠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 ASSIGN_DRIVE_LETTERS_FAILED?
The system failed to assign drive letters during initialization.
Can I fix Assign Drive Letters Failed 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

0x00000043No Such Partition0x0000007BInaccessible Boot Device

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.