Have you ever been startled to see your C drive storage bar turn red even when you haven’t downloaded any large videos? When free disk space runs low, your computer slows down and critical security updates can stall. How can you clean out unnecessary hidden files without touching crucial system files?
At a Glance
- Step 1: Open ‘Settings > System > Storage’ to run Storage Sense and Cleanup recommendations
- Step 2: Clear temp folders (%temp%, C:\Windows\Temp) and reset cache with wsreset.exe
- Step 3: Delete SoftwareDistribution cache and clean WinSxS backups with the DISM command
- Step 4: Disable Hibernation (powercfg.exe /hibernate off) to immediately reclaim space equal to your RAM capacity (e.g., 16 GB)
Start with Built-in Windows Storage Management
Just like seasonal clothes and delivery boxes pile up around the house over time, Windows accumulates temporary files and logs the longer you use it. Low disk space degrades PC performance, and Windows updates require at least 10 GB of free space even when using external storage, making regular maintenance essential.
As of 2026, Windows lets you clean up easily using the built-in ‘Storage Sense’ tool. Navigate to Settings > System > Storage to see disk usage broken down by category at a glance.
| Settings Menu | Key Features | Notes |
|---|---|---|
| Storage Sense | Automatically clears temporary files and Recycle Bin when space is low | Runs only on the C drive by default |
| Cleanup recommendations | Selectively removes large files, unused apps, and synced files | Safely deleted after user confirmation |
Emptying Temporary Files (Temp) and Store Cache
Temporary files created during program installation or execution often linger long after tasks finish. Press Win + R, type %temp%, and your user temp folder (C:\Users\<username>\AppData\Local\Temp) will open, allowing you to select and safely delete all files inside.
You can clear the system-wide temp folder at C:\Windows\Temp the exact same way. If any file is currently in use, simply click Skip and continue.
Additionally, if the Microsoft Store app cache is consuming disk space, open the Run dialog (Win + R) and type wsreset.exe to reset and purge unneeded store cache files (.appx).
Safely Cleaning Windows Update Cache and the WinSxS Folder
Pending installation files left behind after updates accumulate in C:\Windows\SoftwareDistribution\Download. To clear this folder, type services.msc in the Run dialog, temporarily stop three services—Windows Update, Background Intelligent Transfer Service (BITS), and Cryptographic Services—delete the files inside the folder, and then restart the services.
Exercise caution with the C:\Windows\WinSxS folder. Deleting this folder manually in File Explorer will cause critical damage and render the operating system unbootable.
To safely clean up older backup components, always run Dism.exe /online /Cleanup-Image /StartComponentCleanup in Command Prompt as Administrator using Microsoft’s official component cleanup tool.
Reclaiming RAM-Sized Space by Disabling Hibernation (hiberfil.sys)
The hiberfil.sys file located at the root of the C drive occupies roughly the same amount of storage as your PC’s installed RAM. For instance, on a PC with 16 GB of RAM, it reserves up to 16 GB of drive space for hibernation data.
If you do not use Hibernation, open Command Prompt as Administrator and run powercfg.exe /hibernate off to immediately delete the file and recover disk space. Note that disabling hibernation also turns off Fast Startup, so adjust this setting according to your needs.
While some expect a guaranteed amount like 30 GB, actual space freed varies widely based on installed RAM capacity and accumulated update history, ranging anywhere from a few gigabytes to tens of gigabytes.
Open Windows Settings > Storage right now, turn on Storage Sense, and clean out hidden temporary files.
References
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