Disk Usage Sunburst

What is Disk Usage Sunburst?

Disk Usage Sunburst is a WordPress plugin that maps your entire site’s file structure into an interactive sunburst chart. It helps you identify which directories and files consume the most storage space. Developed by RAIDBOXES, this plugin has been actively maintained for 11 years. It currently holds 9K+ active installs and a 4.8/5 rating from 36 reviews. Notably, 92% of those ratings are 2% are one-star. The latest version, 2.0.4, was last updated on May 13, 2026.

If you have ever wondered how to check disk usage in WordPress without touching a command line, this tool provides a visual answer. It scans your wp-content folder, core files, and any other accessible directories. The results appear as a colorful, zoomable chart you can click through. This makes it one of the best big files plugin WordPress options for site owners who want a clear, immediate picture of storage consumption.

Key Features of Disk Usage Sunburst

• Interactive Sunburst Chart: Click any arc to zoom into a folder, or click the center circle to return to the root directory.
• Real-time Tooltips: Hover over any segment to see exact file sizes and last-modified dates without reloading the page.
• Export Options: Download your disk usage visualization as a PNG, SVG, or raw JSON data for reporting.
• Performance Settings: Configure timeout limits and memory caps directly from the settings panel to handle large installations.
• Smart Cache Management: The plugin caches scan results automatically, with a manual clear button for when you need fresh data.
• REST API Endpoints: Developers can access scan data programmatically via /wp-json/disk-usage/v1/ endpoints.
• Multisite Support: Works on WordPress Multisite networks, restricted to Super Admin users for privacy reasons.
• Accessibility Ready: Full keyboard navigation with ESC to zoom out and Home to return to root, plus screen reader support.

Who Should Use Disk Usage Sunburst?

This plugin suits site owners who manage media-heavy blogs, e-commerce stores, or membership sites where storage fills up fast. It requires no developer skills to use. You only need to navigate to Tools → Disk Usage and click “Start Scan.” The chart then reveals exactly which folders hold the largest files. For example, a site with 9K+ active installs suggests a broad audience, from freelancers to agencies.

Beginners will appreciate the one-click scan and intuitive zoom controls. Advanced users can tap the REST API or filter hooks like rbdusb_exclude_paths to customize scans. If you need to visualize disk space WordPress every month to track growth, this plugin gives you a repeatable, visual process. It also works reliably on WordPress 6.9.4, as confirmed by the latest compatibility tests.

Installation & Setup

Installation follows the standard WordPress plugin process: upload the disk-usage-sunburst.zip file to /wp-content/plugins/, activate it from the Plugins screen, then find the tool under Tools → Disk Usage. The setup is beginner-friendly — no configuration is required before your first scan. If you encounter a loading bar that never finishes, check your PHP time limit and increase it, as the plugin can only calculate sizes within the available execution time.

Support & Community

Support metrics show a mixed picture. Over the last two months, 4 support threads were opened, but 0 have been marked as resolved — a 0% resolution rate. This is a notable gap for a plugin with a 4.8 rating. The majority of users (92%) leave five-star reviews, which suggests the plugin works well out of the box for most. The 3% one-star ratings likely stem from timeout issues on larger sites, which the FAQ addresses with a PHP time limit workaround.

The developer, RAIDBOXES, maintains an active email support channel at support@raidboxes.de. The plugin credits Mike Bostock for the D3.js sunburst implementation and Jeffrey Sambells for the human-readable file size PHP function. Despite the unresolved support threads, the long 11-year history and frequent updates (last on May 13, 2026) indicate ongoing maintenance. For most users, the tool delivers on its core promise: helping you tackle WordPress big files without technical overhead.