Microsoft Windows Error Code 0x80070018: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0x80070018
Brand
Microsoft Windows
Product Type
hresult
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 0x80070018 in Microsoft Windows means 'ERROR_BAD_LENGTH' — a problem with data length during file operations or installation. This often appears when copying files, installing updates, or accessing corrupted data. The fix usually involves clearing temporary files, checking disk health, or repairing system files.
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Tools You'll Need

How to Fix Error Code 0x80070018

  1. Run Windows Update Troubleshooter

  2. Clear Temporary Files

    This will delete temporary files, but will not affect personal data.

  3. Run System File Checker

    Do not close the Command Prompt during the scan.

  4. Check Disk for Errors

    This may take a long time on large drives. Do not interrupt the process.

  5. Reset Windows Update Components

    This resets Windows Update. You may need to re-run Windows Update afterward.

  6. Perform a Clean Boot

    This disables non-Microsoft services temporarily. After troubleshooting, re-enable them by reversing the steps.

  7. Run DISM Tool

    This tool repairs Windows system image. Ensure you have a stable internet connection.
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When to Call a Professional

If none of these steps resolve the error, the issue may be due to failing hardware (e.g., RAM or hard drive). Contact a professional technician for diagnostics and repair.

Frequently Asked Questions

What causes error 0x80070018?
Error 0x80070018 is caused by data length mismatches during file operations, often due to corrupted system files, a failing hard drive, or issues with Windows Update components.
Can error 0x80070018 cause data loss?
The error itself doesn't cause data loss, but the underlying issues (like disk corruption) could potentially lead to data loss if not addressed. Always back up important files.
Does error 0x80070018 affect all versions of Windows?
Yes, it can appear on Windows 7, 8, 10, and 11, as well as server editions.
How long does it take to fix error 0x80070018?
Most fixes take 30-60 minutes, but running CHKDSK or DISM may take longer depending on your drive size and speed.
Do I need to reinstall Windows to fix error 0x80070018?
Reinstalling Windows should be the last resort. Most cases can be resolved with the steps above. If hardware is failing, even a reinstall may not help.

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