Free Up Space C Drive Windows 10: 12 Ways

To free up space on your C: drive in Windows 10, you need to remove temporary files, uninstall unused apps, and move personal files to another drive or cloud storage. This guide walks you through the most effective built-in tools and manual methods, from Disk Cleanup to Storage Sense, so you can reclaim gigabytes without third-party software.

Why Is Your C: Drive Full?

Windows 10 installs to the C: drive by default, and it also uses that drive for system files, page files, hibernation, restore points, and temporary updates. Over time, these accumulate. Common culprits include the WinSxS component store, which can grow to several gigabytes, and the Windows.old folder left after a feature update. Additionally, many applications install to C:\Program Files and store user data in C:\Users\YourName\AppData, which can be hidden and hard to spot. Even if you install programs elsewhere, the system drive still holds shared libraries and registry data.

Understanding what fills the drive helps you choose the right cleanup method. The built-in tools target different areas, so using several in combination gives the best result.

Use Storage Sense for Automatic Cleanup

Storage Sense is a Windows 10 feature that automatically deletes temporary files and content in your Recycle Bin after a set period. It can also remove files from the Downloads folder that haven’t been modified in a while. To enable it:

1. Open Settings > System > Storage.
2. Turn on Storage Sense.
3. Click Configure Storage Sense or run it now to set how often it runs and what it deletes.

You can also run it immediately by clicking Clean now. Storage Sense is a good first step because it requires no technical knowledge and runs quietly in the background.

Run Disk Cleanup and Clean Up System Files

Disk Cleanup is a classic tool that removes temporary files, thumbnails, and other junk. For deeper cleaning, you must also clean up system files:

1. Type Disk Cleanup in the Start menu and open it.
2. Select the C: drive and click OK.
3. Click Clean up system files (requires administrator rights).
4. Select the drive again, then check categories like Windows Update Cleanup, Delivery Optimization Files, and Temporary files.
5. Click OK and confirm deletion.

The Windows Update Cleanup option often frees several gigabytes by removing superseded update components. Be aware that after cleaning, you cannot uninstall the latest Windows update, but that is rarely a problem.

Uninstall Unused Apps and Move Large Files

Applications are often the biggest space hogs. Open Settings > Apps > Apps & features and sort by size to see which programs take the most space. Uninstall anything you no longer use. For programs that support it, you can also click Move to relocate them to another drive (like D:) if you have one.

Personal files – videos, photos, downloads – often live on C: without you realizing. Use File Explorer to check folders like Downloads, Documents, and Videos. Move large files to an external drive or cloud storage. You can also change the default save locations for new content in Settings > System > Storage > Change where new content is saved.

Disable Hibernation and Reduce Page File

Hibernation saves your session to a file called hiberfil.sys on C:, which is about 40% of your RAM size. If you never use hibernation (e.g., you always shut down or use sleep), you can disable it and reclaim that space:

1. Open Command Prompt as administrator (type cmd, right-click, and select Run as administrator).
2. Type powercfg /h off and press Enter.

This removes the file immediately. To re-enable later, type powercfg /h on.

The page file (pagefile.sys) is used for virtual memory. Windows manages it automatically, but you can reduce its size or move it to another drive. However, moving the page file to a slow drive can hurt performance. If you have enough RAM (16 GB or more) and never see low-memory warnings, you can set a smaller fixed size. Go to Advanced System Settings > Performance Settings > Advanced > Virtual Memory and adjust. Be cautious: setting it too low can cause instability.

Delete Temporary Files and Empty the Recycle Bin

Temporary files are created by apps and the system. You can clear them manually:

• Press Win + R, type %temp%, and delete everything inside (skip files in use).
• Open This PC, right-click the C: drive, select Properties, and click Disk Cleanup.
• Empty the Recycle Bin by right-clicking it and selecting Empty Recycle Bin.

Also, check the C:\Windows\Temp folder (requires admin). These folders can contain hundreds of MB of leftover files.

Analyze Disk Space with Built-in Tools

To find what is taking space, you can use Windows’ built-in storage view: Settings > System > Storage shows a breakdown by category. Clicking each category shows specific files. For a more detailed view, you can use the Command Prompt with dir /a /s to list folder sizes, but that can be slow. A simpler method is to use the PowerShell command:

Get-ChildItem C:\ -Force -ErrorAction SilentlyContinue | ForEach-Object { if ($_.PSIsContainer) { $sum = (Get-ChildItem $_.FullName -Recurse -Force -ErrorAction SilentlyContinue | Measure-Object -Property Length -Sum).Sum; [PSCustomObject]@{Folder = $_.FullName; SizeMB = [math]::Round($sum / 1MB, 2)} } } | Sort-Object SizeMB -Descending | Select-Object -First 10

This lists the largest folders on C:. It may take a few minutes, but it reveals where the space is going.

Use the Cleanup Recommendations in Settings

Windows 10 includes a dedicated cleanup page under Settings > System > Storage > Cleanup recommendations. It shows temporary files, unused files, and large files. You can select what to delete and click Clean up. This is a safer alternative to third-party cleaners because it only removes items Microsoft has flagged as safe.

Move the OneDrive Folder or Change Its Location

If you use OneDrive, its files are stored in C:\Users\YourName\OneDrive by default. If you have a large OneDrive library, you can move the folder to another drive:

1. Right-click the OneDrive icon in the system tray and select Settings.
2. Go to the Account tab and click Unlink this PC.
3. During setup, choose a different location for the OneDrive folder.

Alternatively, you can use OneDrive’s Files On-Demand to keep files in the cloud and only download them when needed. This frees space without moving the folder.

Frequently Asked Questions

Is it safe to delete files from C:\Windows\Temp?

Yes, files in C:\Windows\Temp are temporary. Windows and apps use them for short-term storage. You can delete them, but some may be in use; skip those. It is safe to clear this folder.

What is the Windows.old folder and can I delete it?

Windows.old is created when you upgrade to a new Windows 10 version. It contains the previous installation so you can roll back within 10 days. After that, you can delete it via Disk Cleanup (select Previous Windows installation(s)). This can free 10-20 GB.

Why is my C: drive full even after deleting files?

System files, page file, hibernation file, and restore points can take tens of GB. Also, some apps store data in hidden AppData folders. Use the storage analysis method above to see what is actually using space.

Should I use a third-party cleaner like CCleaner?

You don’t need third-party tools. Windows 10 has built-in cleanup options that are safe and effective. Third-party cleaners may delete files you want or bundle unwanted software. Stick to the built-in methods.

How often should I clean my C: drive?

It depends on your usage. If you install many programs or download large files, do a cleanup monthly. Otherwise, Storage Sense can handle it automatically. Check your free space occasionally; if it drops below 10% of the drive size, clean up.

Can I move installed apps to another drive?

Yes, for many apps from the Microsoft Store, you can go to Settings > Apps > Apps & features, select the app, and click Move. Traditional desktop apps may not support moving; you would need to uninstall and reinstall to a different drive.

Related

• Disable Notifications Lock Screen: Android & iOS
• Free GameMaker Alternatives for 2D PC Games
• Nest vs Ecobee: Which Smart Thermostat Fits You?