Microsoft Windows Error Code 0x80070051: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0x80070051
Brand
Microsoft Windows
Product Type
hresult
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error 0x80070051 (ERROR_DUP_FAT_ENTRY) indicates a duplicate entry in the file allocation table (FAT), typically on a USB drive, SD card, or external hard drive. This error can prevent you from accessing or modifying files and is often caused by improper ejection, corruption, or file system errors. The following steps will help you diagnose and resolve the issue.
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Tools You'll Need

How to Fix Error Code 0x80070051

  1. Run CHKDSK to Scan and Repair Drive

    Do not interrupt the scan. Data loss is possible; back up important files if you can access them.

  2. Run SFC Scan for System File Corruption

  3. Use DISM to Repair System Image

    Ensure you have a stable internet connection as it may download files from Windows Update.

  4. Check Disk for Bad Sectors and Errors via Properties

  5. Format the Drive (Last Resort)

    This erases all data on the drive. Only do this if you have backups or don't need the files.
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When to Call a Professional

If chkdsk, SFC, and DISM fail to resolve the error, the drive may be physically failing. Contact a data recovery specialist if data is critical, or replace the drive if it's non-essential.

Frequently Asked Questions

What causes error 0x80070051?
It is typically caused by duplicate entries in the file allocation table, often due to improper ejection of external drives, file system corruption, or bad sectors.
Can I recover data from a drive with error 0x80070051?
Yes, you may still be able to recover data using file recovery software before formatting. However, if the drive is badly corrupted, professional help may be needed.
Does error 0x80070051 affect internal hard drives?
It can, but it's more common on removable media like USB drives and SD cards due to their vulnerability to improper removal.
Will formatting the drive fix error 0x80070051?
Yes, formatting will create a new file system, eliminating duplicate entries. But it deletes all data, so back up first if possible.
How can I prevent error 0x80070051?
Always safely eject external drives, regularly run chkdsk, and avoid unplugging drives during read/write operations.

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