My system files are taking up too much space

Use the built-in storage tools in Windows 11 to reduce what is stored on C: and prevent it from filling up again.

1. Turn on Storage Sense so Windows automatically cleans up temporary files:
   1. Select Start > Settings > System > Storage.
   2. Turn Storage Sense to On.
   3. Select Storage Sense and choose how often it should run and what it should delete (for example, temporary files and items in Recycle Bin). This will regularly remove unnecessary files from the system drive.
2. Use Cleanup recommendations to remove large and temporary system files:
   1. Go to Start > Settings > System > Storage > Cleanup recommendations.
   2. Review categories such as Temporary files, Large or unused files, Files synced to the cloud, and Unused apps.
   3. Select items to remove and then select Clean up for each section. This can reduce the size of system-related data and free space on C:.
3. Move personal data off the system drive so that system files are not competing with user files for space:
   1. Connect another internal or external drive if available.
   2. Select Start > Settings > System > Storage > Advanced storage settings > Where new content is saved.
   3. For each content type (documents, music, pictures, videos, etc.), choose another drive. New personal files will then be stored away from C:, leaving more room for Windows system files.
4. Turn on OneDrive Files On-Demand so cloud files do not consume local disk space unnecessarily:
   • Enable OneDrive Files On-Demand so that only placeholder files are stored locally and full files are downloaded only when opened. This reduces the amount of data stored on the system drive.
5. If low disk space errors persist even after cleanup, consider more advanced options:
   • Use external storage during feature updates if Windows reports that more space is needed.
   • If space issues continue and prevent updates, a Windows reset or reinstall may be required as a last resort to reclaim space taken by accumulated system components.

These steps focus on automatically managing temporary/system data, cleaning up existing files, and moving personal content off C:, which together should reduce pressure on the system drive even when system files themselves are large.

References:

• Free up drive space in Windows
• Fix low disk space errors quickly in Windows
• Manage drive space with Storage Sense