How to fix Windows 11 File Explorer showing duplicate drives or drive letters after a Windows update

Windows KB-498

Summary

This guide helps you troubleshoot and resolve: How to fix Windows 11 File Explorer showing duplicate drives or drive letters after a Windows update. Follow the steps below to fix the issue.

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Common Causes

After installing a Windows 11 update, some users notice that File Explorer displays duplicate drive entries or assigns incorrect drive letters to their storage devices. This typically occurs when the update modifies partition metadata or fails to refresh the existing drive mappings correctly. The good news is that this issue can usually be resolved using built-in Windows tools without any data loss. This guide walks you through the most effective methods to restore normal drive behaviour in File Explorer.

Quick Fix Steps

Before diving into detailed instructions, try these quick remedies first. They resolve the issue in most cases:

Restart your computer to force Windows to re-enumerate connected storage devices.
Run the Hardware and Devices troubleshooter via msdt.exe -id DeviceDiagnostic from an elevated Command Prompt.
Reassign the affected drive letter using Disk Management.

Detailed Instructions

Method 1: Reassign Drive Letters Using Disk Management

Disk Management allows you to change drive letters and remove phantom entries that appear after an update.

Right-click the Start button and select Disk Management.
Review the list of volumes and note any duplicate or incorrect drive letter assignments.
Right-click the volume with the incorrect letter and choose Change Drive Letter and Paths….
Click Change, select a new letter from the dropdown, then click OK.
Confirm the warning prompt by selecting Yes.
Repeat for any other affected volumes, then restart your computer.

If a duplicate entry has no drive letter assigned, right-click it and choose Change Drive Letter and Paths… to either assign a letter or remove the entry if it points to an inaccessible partition.

Method 2: Remove Phantom Drive Entries From the Registry

If Disk Management does not show the duplicate drive but File Explorer still displays it, the entry is likely stored in the registry. Removing these stale references usually clears the phantom listing.

Editing the registry incorrectly can cause serious system problems. Back up the registry before proceeding, and follow each step carefully.

Press Win + R, type regedit, and press Enter. Click Yes when prompted by User Account Control.
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices.
Right-click the MountedDevices key and select Export to create a backup.
Look for entries beginning with \DosDevices\ followed by a drive letter. Identify any that reference missing or disconnected drives.
Right-click the unwanted entry and choose Delete.
Close Registry Editor and restart your computer.

Method 3: Rebuild the Mounted Devices Database

When multiple duplicates persist, rebuilding the mounted devices database provides a clean slate.

Open an elevated Command Prompt by pressing Win + X and selecting Terminal (Admin).
Type the following command and press Enter:
mountvol /R
Restart your computer when prompted.
After reboot, Windows will rebuild the mounted devices list automatically. Verify File Explorer now shows the correct drives.

Method 4: Check for Hidden or Unmounted Partitions

Sometimes a Windows update reveals partitions that were previously hidden, such as recovery or EFI system partitions. These should generally be left alone, but you can confirm they are functioning correctly.

Open Disk Management as described in Method 1.
Locate partitions without drive letters and verify their status (Healthy, System, Recovery, etc.).
Avoid assigning letters to partitions labelled System, Boot, or Recovery, as this can prevent Windows from starting.
If a partition shows as RAW or Unallocated unexpectedly, do not format it. Open a support ticket for further assistance.

Never format, delete, or assign a drive letter to the EFI System Partition, Microsoft Reserved Partition, or Recovery Partition. Doing so can render Windows unbootable.

Troubleshooting

If the issue persists after completing the methods above, work through these additional checks:

Check for pending updates: Open Settings > Windows Update and install any optional or cumulative updates that may address the bug. See How to update Windows for guidance.
Run System File Checker: Open an elevated Command Prompt and run sfc /scannow to repair corrupted system files that may be causing incorrect drive enumeration.
Check for conflicting storage software: Third-party partitioning tools or backup utilities can sometimes create virtual drives that appear in File Explorer. Temporarily disable or uninstall these applications to test.
Reset File Explorer: Close all File Explorer windows, then open Task Manager and end any explorer.exe processes. Relaunch File Explorer by pressing Win + E.
Review update history: If the problem began immediately after a specific update, consider uninstalling it via Settings > Windows Update > Update history > Uninstall updates. Refer to Troubleshooting Windows 11 Update Issues for more detail.

If you have completed all steps and File Explorer still shows duplicate drives or incorrect letters, our support team can investigate further. Please open a ticket through the 220 support portal with screenshots of Disk Management and the affected File Explorer view.

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