How to fix Windows 11 File Explorer showing the wrong drive letter or missing drives after an update

Summary

This guide helps you troubleshoot and resolve: How to fix Windows 11 File Explorer showing the wrong drive letter or missing drives after an update. Follow the steps below to fix the issue.

Common Causes

After a Windows 11 feature update, cumulative update, or driver change, File Explorer can occasionally display the wrong drive letter, hide a partition entirely, or fail to recognise a connected drive. In most cases, the underlying disk is healthy and the issue is caused by a stale drive letter assignment, a missing mount point, or a driver that needs to be reinitialised. This guide walks you through the steps to restore correct drive letters and bring missing drives back into view.

Before You Begin

Confirm the drive is physically detected before changing any settings. Open Device Manager by pressing Windows + X and selecting Device Manager. Expand Disk drives and verify your drive appears without a yellow warning triangle. If a warning is shown, right-click the drive, choose Properties, and review the device status code before continuing.

Quick Fix Steps

1. Restart Windows to remount any disconnected volumes.
2. Open Disk Management by pressing Windows + X and selecting Disk Management.
3. Confirm all partitions are visible and have a drive letter or path assigned.
4. If a partition shows as RAW or Unallocated, run chkdsk from an elevated Command Prompt.
5. Reinstall the storage controller driver from Device Manager if the issue began after a driver update.

Detailed Instructions

Check Disk Management

Disk Management is the most reliable place to see every partition, even those hidden from File Explorer.

1. Press Windows + X and select Disk Management.
2. Review the lower pane. Each disk is listed with its partitions.
3. Look for any partition that does not have a drive letter (no letter such as C:, D:, E: next to the volume).
4. Right-click the affected partition and choose Change Drive Letter and Paths….
5. Click Add, select a letter from the drop-down, and choose OK.

Assign a New Drive Letter

If the drive is detected but File Explorer shows the wrong letter, you can reassign it.

1. In Disk Management, right-click the volume and choose Change Drive Letter and Paths….
2. Select the current letter and click Remove. Confirm the warning.
3. Click Add, pick a new letter, and select OK.
4. Close Disk Management and refresh File Explorer with F5.

Run CHKDSK to Repair File System Errors

If a partition shows as RAW or is missing despite being detected, the file system may be corrupted.

1. Press Windows + S, type cmd, and select Run as administrator.
2. Type chkdsk X: /f /r (replace X with the affected drive letter) and press Enter.
3. If the drive is in use, you will be prompted to schedule the scan for the next restart. Type Y and reboot.
4. Allow the scan to complete. This can take several hours on large drives.

Reinstall the Storage Controller Driver

A faulty or outdated storage driver is a common cause after a Windows update.

1. Press Windows + X and open Device Manager.
2. Expand Storage controllers (or IDE ATA/ATAPI controllers on some systems).
3. Right-click the primary storage controller (commonly Intel(R) RST or Standard NVM Express Controller) and choose Uninstall device.
4. Tick Attempt to remove the driver for this device if the option appears, then confirm.
5. Restart Windows. The driver will reinstall automatically.

Run the Hardware and Devices Troubleshooter

1. Press Windows + I to open Settings.
2. Navigate to System > Troubleshoot > Other troubleshooters.
3. Find Hardware and Devices and select Run.
4. Follow the prompts and apply any recommended fixes.

Check for a Pending Windows Update

Microsoft regularly releases fixes for storage and File Explorer issues.

1. Open Settings with Windows + I.
2. Select Windows Update from the left pane.
3. Click Check for updates and install anything pending.
4. Restart when prompted and verify the drive letter is correct.

Troubleshooting

The Drive Still Does Not Appear

• Open an elevated Command Prompt and run diskpart, then type list volume to confirm Windows detects the partition.
• If the volume is listed as Hidden, type select volume X (replace X with the number), then assign letter=E (or any free letter).
• Check the BIOS or UEFI firmware to confirm the SATA or NVMe port is enabled and the drive is not switched off.
• Test the drive in another computer or with a different cable to rule out hardware failure.

Drive Letter Keeps Reverting After Reboot

• A background service or scheduled task may be reassigning the letter. Open Task Scheduler and review tasks under Task Scheduler Library for any reference to the drive.
• Disable any third-party partition tools (such as MiniTool or Macrium) that may be auto-assigning letters.
• Ensure the drive is not part of a Storage Spaces pool or a dynamic disk configuration that overrides manual assignments.

RAW File System Error

A RAW partition means Windows cannot read the file system. Do not format the drive until you have attempted recovery.

• Run chkdsk X: /f from an elevated Command Prompt.
• Use a reputable data recovery tool to copy files to another drive before attempting a format.
• If recovery is unsuccessful, back up what you can and use Disk Management to format the volume as NTFS.

External Drive Not Recognised

• Try a different USB port, preferably one directly on the motherboard (rear panel on a desktop).
• Open Device Manager, expand Universal Serial Bus controllers, and uninstall any unknown USB devices, then rescan.
• Test the drive on another computer to confirm it is functional.

Related Articles

• How to free up disk space in Windows 11
• How to check disk health using S.M.A.R.T. data in Windows
• How to troubleshoot USB devices that are not detected in Windows 11

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