Question 1

How much free disk space should I leave on Windows 11?

Accepted Answer

Microsoft recommends keeping at least 20 GB free on the system drive for updates. For comfortable daily use — especially on laptops with large apps — aim for 15–25% free space. SysOverlay warns on the desktop and in the fleet dashboard when free space drops below about 15 GB.

Question 2

Why does my C drive keep filling up after cleanup?

Accepted Answer

Common causes include Windows Update cache, restore points, hibernation files, cloud sync folders, game installs, and temporary app data. Check Storage settings, run Disk Cleanup, and review large folders. SysOverlay shows free space on the desktop so you catch the trend before updates fail.

Question 3

Can I get an alert when disk space is low?

Accepted Answer

Windows shows occasional notifications but no persistent desktop indicator by default. SysOverlay shows free disk on the HUD at all times; with Home Plus or Pro you get dashboard alerts and optional email when a PC crosses the low-disk threshold.

Check disk space in Windows 11

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