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Fix Error 0x800701aa: Causes & Solutions

Guide 10-30499 · Updated · Step by step

Error 0x800701aa is a Windows file-copy or file-transfer error that typically appears when you try to move or copy files to or from an external drive, network location, or cloud-synced folder. The fix usually involves checking the drive’s file system, updating drivers, or disabling the problematic sync feature; below are the specific steps to resolve it.

What Does Error 0x800701aa Mean?

This error code is associated with the Windows operating system and is most commonly reported when copying large files or folders. The message often reads “Error 0x800701aa: The requested operation is partially successful” or similar. It indicates that the file transfer did not complete fully, leaving the destination incomplete or the source partially read. This can happen with USB drives, SD cards, network shares, or even internal drives when the file system or driver has an issue.

Common Causes

  • Faulty or outdated storage drivers – especially USB or SATA controllers.
  • File system corruption on the source or destination drive (e.g., bad sectors, improper ejection).
  • Interference from cloud sync apps (OneDrive, Google Drive, Dropbox) that lock files during transfer.
  • Power management settings that suspend the USB port mid-transfer.
  • Overheating or failing hardware – less common but possible.

Step-by-Step Fixes

1. Run CHKDSK on the Affected Drive

  1. Open Command Prompt as administrator (search “cmd”, right-click, Run as administrator).
  2. Type chkdsk X: /f /r (replace X with the drive letter of the source or destination).
  3. Press Enter. If the drive is in use, you’ll be prompted to schedule the check on restart – type Y and restart.
  4. Allow the scan to complete; it may take a while for large drives.

2. Update or Reinstall Storage Drivers

  1. Right-click the Start button and select Device Manager.
  2. Expand “Disk drives” and “Universal Serial Bus controllers”.
  3. Right-click each device and choose “Update driver” – select “Search automatically for drivers”.
  4. If no update is found, right-click and “Uninstall device”, then restart your PC. Windows will reinstall the driver.

3. Disable USB Power Saving

  1. Open Device Manager, expand “Universal Serial Bus controllers”.
  2. Right-click each “USB Root Hub” and select Properties.
  3. Go to the “Power Management” tab, uncheck “Allow the computer to turn off this device to save power”.
  4. Repeat for all USB Root Hubs and restart.

4. Pause or Disable Cloud Sync Temporarily

If you’re copying to/from a folder that syncs with OneDrive or another cloud service, right-click the cloud icon in the system tray and select “Pause syncing” for a few hours. Try the transfer again. If it works, the sync was interfering.

5. Copy in Smaller Batches

If the error appears only with very large files or folders, try copying in chunks (e.g., 1-2 GB at a time). This can help isolate which file is causing the issue.

6. Check for Bad Sectors with Third-Party Tools

If CHKDSK doesn’t find errors, use a tool like CrystalDiskInfo (free) to check the drive’s health. If it shows “Caution” or “Bad”, back up your data immediately and replace the drive.

What If the Error Persists?

If none of the above work, try the following:

  • Use a different USB port (preferably a USB 3.0 port directly on the motherboard).
  • Try a different cable (if using an external drive).
  • Copy the files to your local drive first, then to the destination.
  • If the destination is a network drive, try mapping it with a different protocol (e.g., SMB vs. NFS).
  • Run sfc /scannow in Command Prompt to repair system files.

Frequently Asked Questions

Can error 0x800701aa cause data loss?

Yes, if the transfer is interrupted, the destination file may be incomplete or corrupted. However, the source file is usually intact. Always verify the copied file’s size and checksum before deleting the source.

Is this error related to a virus?

Not typically. It’s a hardware/driver issue. However, if you suspect malware, run a full Windows Defender scan.

Does this error occur on Windows 11 as well?

Yes, it has been reported on both Windows 10 and Windows 11. The fixes are the same.

Can I ignore this error and continue?

No, the transfer is not complete. Ignoring it may result in corrupted files. Always resolve the error before relying on the copied data.

Why does it happen only with large files?

Large files take longer to transfer, making them more susceptible to driver timeouts, power-saving interruptions, or file system errors that become evident during extended read/write operations.

Preventing Future Occurrences

  • Always safely eject external drives before unplugging.
  • Keep your Windows and drivers updated.
  • Use a quality USB cable and port.
  • Regularly run CHKDSK on important drives.
  • If using cloud sync, ensure you have enough local storage and a stable internet connection.

Related

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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