Fix Error 0x80071a91 on Windows 10

To fix error 0x80071a91 on Windows 10, you need to resolve a file system corruption issue, most often by running chkdsk /f on the affected drive or using the sfc /scannow command. This error typically appears when Windows Update, the Microsoft Store, or a backup tool cannot write to a file because the disk’s file system is damaged or the volume is locked.

What Is Error 0x80071a91?

Error 0x80071a91 is a Windows error code that translates to ERROR_FILE_SYSTEM_CORRUPTION. It means the operating system detected corruption in the NTFS or ReFS file system on your hard drive or SSD. When this happens, Windows cannot reliably read or write data, so operations like installing updates, downloading apps, or creating system restore points fail with this code.

The error is not specific to one component. You may see it in Windows Update, Microsoft Store, Windows Backup, or even when copying large files. The underlying cause is the same: the file system metadata (like the master file table, directory entries, or volume bitmap) is inconsistent or damaged.

Why Does This Error Occur?

File system corruption usually stems from one of several events:

• Unexpected power loss – If your PC loses power while writing to disk, the file system may be left in an inconsistent state.
• Improper shutdown – Forcing a shutdown by holding the power button can cause similar issues.
• Failing storage device – A dying hard drive or SSD with bad sectors can corrupt data.
• Malware or driver issues – Some malware or buggy storage drivers can write incorrect data to the file system.
• Interrupted system updates – If an update is interrupted mid-write, the file system may be left corrupted.

It’s important to note that the error does not mean your files are necessarily lost. In many cases, the corruption is limited to metadata, and your personal files remain intact. However, you should back up important data before attempting repairs, just in case.

How to Fix Error 0x80071a91

Here are the most effective methods to resolve the error, ordered from least to most invasive. Try them in order and test after each step.

Method 1: Run Check Disk (chkdsk)

1. Open Command Prompt as administrator (right-click Start, select “Command Prompt (Admin)” or “Windows PowerShell (Admin)”).
2. Type chkdsk /f C: and press Enter. Replace C: with the drive letter where the error occurs.
3. If the drive is in use, you’ll be prompted to schedule the check for the next restart. Type Y and restart your PC.
4. Windows will scan the drive and attempt to fix file system errors. This may take several minutes to hours depending on drive size.

The /f parameter tells chkdsk to fix errors. You can also use /r to locate bad sectors and recover readable information, but it takes longer. For severe corruption, run chkdsk /f /r.

Method 2: Run System File Checker (SFC)

1. Open Command Prompt as administrator.
2. Type sfc /scannow and press Enter.
3. Wait for the scan to complete. It will verify and repair protected system files.
4. If SFC finds errors but cannot fix them, run DISM /Online /Cleanup-Image /RestoreHealth (as administrator) and then rerun SFC.

SFC is useful if the corruption is in system files, not just the file system metadata. DISM repairs the Windows image itself.

Method 3: Check the Drive’s Health

If chkdsk and SFC don’t help, the drive may be failing. Open This PC, right-click the drive, select Properties → Tools → Check (under Error checking). Windows will scan for bad sectors. You can also use third-party tools like CrystalDiskInfo to view SMART status, but the built-in tool is enough for a basic check.

If the drive reports failing health, back up your data immediately and replace the drive.

Method 4: Run Windows Update Troubleshooter

1. Go to Settings → Update & Security → Troubleshoot.
2. Select Windows Update and run the troubleshooter.
3. Follow the prompts. It may clear the update cache and reset Windows Update components.

This is a good step if the error appears specifically during Windows Update. The troubleshooter can fix common update-related issues that might be causing the file system conflict.

Method 5: Perform a Clean Boot

1. Press Win + R, type msconfig, and press Enter.
2. Under the Services tab, check “Hide all Microsoft services” and click Disable all.
3. Under the Startup tab, click Open Task Manager, disable all startup items, and close Task Manager.
4. Click OK and restart. If the error disappears, a third-party service or startup program is interfering.

Clean boot helps isolate software conflicts. You can then re-enable services one by one to find the culprit.

Common Mistakes and Misconceptions

One common mistake is running chkdsk on a drive that is currently in use without the /f flag – it will only report errors, not fix them. Another is ignoring the need to run as administrator; without admin rights, the commands will fail with “Access denied.”

Some users assume the error means their hard drive is dead. That’s rarely true. File system corruption is often repairable, and the drive may work fine for years afterward. However, if the error keeps coming back, it’s a strong sign of hardware failure.

Also, don’t confuse error 0x80071a91 with 0x80070091 (which is a different file system error) or 0x80071ac3 (which is a volume-related error). The fix for 0x80071a91 specifically targets file system corruption.

When to Seek Professional Help

If you’ve tried all methods and the error persists, or if you suspect the drive is failing, it’s time to consult a professional. A data recovery specialist can often salvage data from a failing drive, but it’s expensive. Before that, try backing up your files to an external drive or cloud service – if you can access them at all.

If the drive is still under warranty, contact the manufacturer for a replacement. Do not attempt to open the drive yourself – that can void the warranty and make data recovery impossible.

Frequently Asked Questions

Will I lose my files if I run chkdsk?

Chkdsk is designed to repair file system errors without deleting your personal files. However, if it encounters corrupted files that cannot be repaired, it may place them in a folder called found.000 on the drive. You can often recover data from those files, but they may be incomplete. Always back up important data before running chkdsk.

Can I fix error 0x80071a91 without restarting my PC?

For chkdsk on the system drive, a restart is usually required because the drive is in use. You can try running SFC without a restart, but it may not fix file system corruption. If the error is on a non-system drive (like D: or E:), you can run chkdsk without restarting.

Is error 0x80071a91 a sign of a virus?

Not directly. A virus could cause file system corruption, but the error itself is not a malware indicator. If you suspect malware, run a full Windows Defender scan or a third-party antivirus scan.

Why does the error appear only when I use Windows Update?

Windows Update writes many files to the system drive, and if the file system is corrupted, those writes fail. The error code is the same as any other file system corruption, but it manifests during update because that’s when the system is doing heavy disk I/O.

Can I use System Restore to fix this error?

If you have a restore point from before the corruption occurred, you can try System Restore. However, if the file system is corrupted, System Restore may fail as well. It’s worth a try, but chkdsk is the more direct solution.

How long does chkdsk take?

It depends on the drive size and speed. A 1TB hard drive can take several hours, while an SSD might take 30 minutes. You can monitor progress on the screen. Do not interrupt chkdsk once it starts – that can worsen the corruption.

Related

• How to Turn On Dark Mode in X (Twitter)
• Fix Missing Sounds Tab in Windows 10
• Hide or Remove Copilot from Windows 11 Taskbar