How to Fix “Upload: Failed to Write File to Disk” Error in WordPress

How to Fix “Upload: Failed to Write File to Disk” Error in WordPress

Getting the error “Upload: Failed to write file to disk” while trying to upload media in WordPress? This is a common issue usually related to file permissions or server settings, and it prevents files from being stored properly.

Luckily, the fix is straightforward if you have access to cPanel.

What Causes This Error?

- Incorrect folder permissions on wp-content/uploads
- PHP temporary folder is missing or not writable
- Disk quota exceeded or low server space
- Ownership or permission conflicts

Step-by-Step: How to Fix the Issue in WordPress

1. Check and Correct File Permissions

Incorrect folder permissions are the most common cause.

- Log in to cPanel > File Manager
- Navigate to public_html/wp-content/uploads
- Right-click the uploads folder > Change Permissions
- Set the folder to 755 (Owner: read, write, execute; Group & Public: read, execute)

Also ensure all subfolders have 755 and files have 644 permissions.

2. Verify Disk Space

If your hosting account is full, uploads won’t work.

- Go to cPanel > Disk Usage
- Check if your disk space is maxed out
- Delete unused files, backups, or emails to free up space

3. Configure Temporary Folder

WordPress uses a temporary directory before moving files to uploads.

- In cPanel File Manager, go to public_html
- Open or create php.ini or .user.ini
- Add this line:

upload_tmp_dir = /tmp

Ensure the /tmp directory exists and has proper permissions.

4. Change File/Folder Ownership (Advanced)

If file ownership is mismatched (common after manual uploads or migrations):

- Contact your hosting provider and ask them to fix file ownership for your WordPress directory
- Or use SSH (if available) to run chown commands

5. Increase PHP Upload Limits

Sometimes this error is paired with memory or file size limits.

- In cPanel > MultiPHP INI Editor or Select PHP Version > Options:
 - memory_limit = 256M
 - upload_max_filesize = 64M
 - post_max_size = 64M

6. Use an FTP Client (Temporary Fix)

If you’re in a rush to upload something:

- Use an FTP tool like FileZilla to upload files manually into wp-content/uploads
- Then use “Add From Server” plugin to bring them into WordPress

Final Thoughts

The “Upload: Failed to write file to disk” error in WordPress is usually due to permissions or server-side limits. With cPanel access, you can fix it within minutes and restore normal upload functionality.

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At RDPCore.com, we make sure your WordPress site works without limits:

- Proper folder permissions and upload support out of the box
- Full-featured cPanel access for easy management
- Generous SSD storage and PHP optimization tools
- 24/7 expert support to solve upload issues fast

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