How to Free Up Disk Space in Windows 11 (Complete Guide)
Where Your Disk Space Goes
A drive that starts with 30 GB free can fill up quickly without installing anything new. The most common culprits: previous Windows installation files (up to 10 GB), update cache, system and app temporary files, unempied recycle bin, Windows backups, and the hibernation file.
Built-in Tool: Temporary Files
Go to Settings → System → Storage → Temporary files. Windows shows how much each category occupies. Check and remove:
- Previous Windows installation files: can free up to 10 GB after updating Windows
- Delivery Optimization cache: 1-5 GB on recently updated systems
- Temporary files: app leftovers
- Thumbnails: regenerated automatically if deleted
- Recycle Bin: empty it directly from here
Storage Sense: Automatic Cleanup
Enable Storage Sense in Settings → System → Storage → Storage Sense. Configure it to run automatically when free space is low, empty the recycle bin every 30 days, and delete files from the Downloads folder that haven’t been opened in 60+ days.
WinDirStat: Find What’s Taking Up Space
WinDirStat (free) shows a visual map of your drive where each rectangle represents a file or folder proportional to its size. It’s the fastest way to find 5-50 GB folders you didn’t know you had.
- App cache folders like Adobe, Chrome, or VS Code (can be several GB)
- Old game folders in Steam or Epic
- Forgotten virtual machine files (VHD, VMDK)
- Memory dump folders (C:\Windows\Minidump)
Advanced Space-Freeing
- Disable hibernate: hiberfil.sys uses ~75% of RAM. If you don’t use hibernation: cmd as admin →
powercfg /hibernate off - Single restore point: reduce the space allocated in System Protection settings
- OneDrive on-demand: enable Files On-Demand so OneDrive files don’t take local space until opened
Is it safe to delete the Windows.old folder?
Yes. Windows.old is the copy of the previous Windows installation. It takes 10-20 GB and Windows deletes it automatically after 10 days. You can delete it earlier from Temporary files.
How do I free space on C: if there are no files I can delete?
Consider moving Documents, Pictures, or Downloads to a D: drive if you have one. You can also move game installation directories from Steam (Settings → Storage).
How much free space should I keep on drive C:?
Windows needs free space to function correctly, especially for updates. Always keep at least 15-20 GB free. Below 10 GB the system starts misbehaving.
Conclusion
Start with Temporary files in Settings (frees several GB in minutes), then use WinDirStat to find the large files you didn’t know you had. Enable Storage Sense for automatic basic cleanup going forward.
