3 Ways To Fix “WordPress Failed To Write File To Disk”

WordPress failed to write file to disk” – it’s a phrase that is frustrating and confusing. If you’re seeing this WordPress error, you’ll recognize the mix of frustration and urgency. It could be a simple plugin update halted in its tracks or an important media file that refuses to upload. 

These issues arise more frequently than you’d think and can usually be resolved without professional help. In this article we will talk about what triggered it and three different ways to fix the error. 

TL;DR: If you encounter the “WordPress failed to write file to disk” error, it often requires changes to core files and folders. Always take a backup of your site first using a tool like BlogVault. Adjusting file permissions or checking your hosting quota can usually fix the problem. These steps can help get everything back on track safely.

What is the “WordPress failed to write file to disk” error?

The “WordPress failed to write file to disk” error shows up when WordPress has trouble saving files on your server. It usually happens during media uploads to your wp-content folder or when you’re installing plugins or themes. The error is a sign that something’s off with your file permissions or server setup.

The error usually occurs because WordPress doesn’t have the right permissions to save files. For WordPress to work well, folders should have permissions set to 755 and files set to 644. Think of it as needing the right key to open a locked door.

Another reason could be insufficient space. Your server might be out of space, stopping WordPress from saving new files. It’s like trying to pack more clothes into a suitcase that’s already full.

Lastly, the error might pop up if your temporary folder is not set or configured correctly. This folder helps with uploads, and if it’s not right, WordPress gets stuck. Fixing this involves tweaking some server settings.

How to fix the “WordPress failed to write file to disk” error?

Now that you know what causes the “WordPress failed to write file to disk” error, let’s focus on how to fix it. The process involves examining file permissions, ensuring sufficient disk space, and configuring server settings. These solutions require a bit of technical work, but don’t worry – they’re easier than they sound. 

Note: Before you start, always remember to back up your site using a WordPress backup plugin like BlogVault. With a backup in place, you’re all set to dive into troubleshooting and get your WordPress site running smoothly again. 

1. Modify file permissions

Understanding WordPress file permissions is crucial when managing a WordPress site. Permissions control who can read, write, or execute files and folders on your server. If a file or folder doesn’t have the right permissions, it can prevent WordPress from working properly. For instance, incorrect permissions can trigger the “failed to write file to disk” error. This happens because WordPress can’t write files when it lacks the needed access. 

In this section, we’ll explore how file permissions work, why the right settings are essential, and how to adjust permissions to keep your site running smoothly. With the correct setup, you can help prevent errors and maintain a secure WordPress environment.

• Click on Open Connection in the top left corner.
• Enter your server details, including Server (hostname), Username, and Password.
• Choose the appropriate protocol (usually SFTP for secure connections).
• Click Connect to access your server files.
• Once connected, browse to the directory where WordPress is installed. Typically, this will be in a folder named public_html or www.
• Navigate to the wp-content folder where issues usually arise with uploads, plugins, and themes.
• Right-click on the folder you need to adjust (for example, uploads inside wp-content).
• Choose Info from the context menu.
• In the Info window, you’ll see a section for permissions.
• Set the folder permissions to 755.
• Click OK to save any changes you’ve made.

After applying the new permissions, go back to your WordPress site. Try uploading a file or installing a plugin/theme again to see if the error is resolved.

2. Clear the temporary folder

The temporary folder is an important part of how WordPress handles files. When you upload media or install plugins, files pass through this folder on their way to their final destination. Think of it as a waiting area for files.

The “failed to write file to disk” error might pop up if the temp folder becomes full. This means there’s no room left for new files to wait before being stored permanently. When space in the temp folder runs out, WordPress can’t process uploads or installations, resulting in this error.

If you use a reliable web host, you can reach out to them. They can help you clear it out.  Hosting providers have access to server controls that you might not, and they can help clear out the temp folder safely. Explain the issue and ask them to check for any residual files taking up space, ensuring there’s enough room for your WordPress processes. They can also adjust server settings to prevent the problem from happening again.

3. Upgrade your hosting plan

When the “WordPress failed to write file to disk” error keeps popping up, it might be due to limited disk space on your server. If your site has grown over time or you’re running multiple websites, it’s possible you’ve maxed out your current hosting plan’s storage allowance. In such cases, upgrading your hosting plan to one with more disk space can be a simple and effective solution.

How to prevent the”Failed to write file to disk” error?

Prevention is always better than cure, especially when it comes to managing your WordPress site. By taking a few proactive steps, you can avoid the “failed to write file to disk” error altogether.

• Ensure proper file permissions: Each part of your WordPress file structure will need appropriate file permissions. Directories should be set to 755, which allows the owner to read and write, but limits others to only read and execute. Files should be set to 644, permitting the owner to read and write, while others can only read. Correct permissions ensure that WordPress can write files without exposing your site to security risks.
• Monitor server disk space: Regularly check your server’s available storage to ensure there’s enough room for uploads and updates. Disk space can fill up quickly with media files and backups, so it’s crucial to keep an eye on your usage to prevent unexpected errors.
• Choose a reliable hosting provider: Opt for a hosting provider with adequate resources that match your website’s needs. Reliable hosting services offer scalable plans, robust customer support, and up-to-date infrastructure, making them better equipped to handle your WordPress site’s demands.
• Perform regular maintenance: Regularly optimize your database to keep it running efficiently. Clean up unused files and plugins to free up space and enhance performance. Routine maintenance helps prevent issues before they arise and keeps your site operating smoothly.
• Adjust PHP settings: Adjust settings like upload_max_filesize and post_max_size in your php.ini file. These settings determine the maximum size files can be for uploads and posts. Increasing them might be necessary for sites dealing with larger media files. Consult your hosting provider or a WordPress expert if you need guidance on modifying these settings.

Final Thoughts

When dealing with errors like “failed to write file to disk,” it’s crucial to proceed with caution. As you make changes to important files and folders, always start by creating a backup of your site. Using a tool like BlogVault ensures you can restore your site if needed. A backup acts as your safety net, protecting your data and efforts.

Additionally, consider using a staging site to test changes before going live. A staging site is a copy of your website where you can experiment without risking downtime or errors on your main site. It allows you to play around with settings, adjust permissions, and tweak configurations with peace of mind.

By backing up your site and utilizing a staging environment, you can safely troubleshoot and fix issues while minimizing risk. These precautions not only prevent headaches but also ensure your WordPress site remains secure and efficient.

FAQs

Why does it say “failed to write file to disk”?

This error usually happens when WordPress doesn’t have the right permissions to save files to a specific directory on your server. It can also occur if your server is out of disk space, or if there’s an issue with the temporary folder where files are initially stored.

Why can’t I upload a file to WordPress?

If you’re unable to upload a file, it could be due to incorrect file or folder permissions, limited disk space on your server, or a configuration issue with the temporary folder. Additionally, the file size might exceed the limits set in your php.ini file, such as upload_max_filesize and post_max_size.

What does “unable to write data to disk” mean?

This message indicates that a program, like WordPress, attempted to save data but couldn’t complete the action. It often relates to similar issues as the “failed to write file to disk” error, such as insufficient permissions, no available disk space, or a temporary storage problem.

How to fix file and folder permissions error in WordPress?

You can fix permissions errors by using an FTP client like Cyberduck. Connect to your server and navigate to the WordPress directory. Set folder permissions to 755 and file permissions to 644. Make sure permissions are applied recursively to ensure all files and folders are adjusted correctly. This setup allows WordPress to manage files securely and efficiently, preventing permission-related errors.