See what is filling the drive
Open Settings → System → Storage to see categories such as apps, temporary files and documents. Check This PC in File Explorer for available space. If Windows updates are failing, free space on the system drive first.
Use Storage Sense thoughtfully
Microsoft's Storage Sense can remove selected temporary files and old Recycle Bin items automatically. Open its settings and read the retention options. Downloads and synced cloud files are not normally removed unless you choose settings that include them.
Review cleanup recommendations
Windows offers Cleanup recommendations for temporary files, large unused files, cloud-synced files and apps. Inspect each category before deleting anything. If you're unsure about a folder, research it rather than using a tool that promises to remove 'all junk'.
Move files and keep a backup
Move big photos, installers and videos to a trusted external drive or well-managed cloud space. Verify copies before deleting originals. Avoid manually removing unknown files from the Windows, Program Files or recovery partitions; doing so can make the system unstable.
Information for general education. Check device specifications and manufacturer instructions before changing hardware.
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