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Last updated: September 12, 2026 How to Fix 100% Disk Usage in Windows 10 and Windows 11 Seeing 100% disk usage in Windows 11 can make your computer extremely slow. Apps may take a long time to open, File Explorer may stop responding, and Windows may freeze. 100% disk usage does not automatically mean that your hard drive or SSD is failing. Windows services, background applications, malware, low RAM, storage problems, file-system errors, or a slow mechanical HDD can all cause high disk activity. This guide explains how to find the cause and fix 100% disk usage on Windows 11 and Windows 10 . What Does 100% Disk Usage Mean? In Task Manager, the Disk percentage shows how busy the storage drive is with read and write operations. 100% disk usage does not mean that your drive is 100% full. It means the drive is fully busy at that moment. A short period of 100% activity can be normal during Windows updates, file transfers, antivirus scans, indexing, backups, or oth...