Your C: drive may be full, leading to Windows sending persistent reminders about low disk space or updates failing to install due to insufficient room. Fortunately, Windows 11 comes equipped with a variety of built-in tools designed to help you reclaim that space efficiently. Understanding which tools to use and in what sequence can make a significant difference, as some methods can clear gigabytes in mere moments while others require a bit more setup.
This guide outlines every verified method for recovering disk space, starting with the quickest and most commonly used techniques. You can begin at the top and stop once you’ve reclaimed enough space. The initial steps are safe and reversible, while the few irreversible actions are clearly marked to ensure you know what you’re committing to.
Run Cleanup Recommendations First
This method is the fastest and typically yields the highest value. It presents the most significant and safest options on a single screen.
- 1.Navigate to Start > Settings > System > Storage.
- 2.Select Cleanup recommendations.
- 3.Review categories such as Temporary files, Large or unused files, Files synced to the cloud, and Unused apps.
- 4.Expand a category and select the checkboxes for the items you wish to remove, with Windows indicating how much space each item will free up.
- 5.Click the Clean up button for that section.
If it has been less than 10 days since your Windows upgrade, your previous installation will also appear here as a system file available for deletion. This can recover several gigabytes, but be aware that this action is irreversible and will eliminate your ability to revert to the earlier version. After this period, Windows will remove it automatically.
Clear Temporary Files Manually
If you prefer more granular control than what Cleanup recommendations provide, you can manually clear temporary files.
- 1.Go to Start > Settings > System > Storage.
- 2.Select Temporary files. Windows will perform a brief scan and list the categories along with their sizes.
- 3.Check the boxes for the categories you wish to clear, which may include Windows Update Cleanup, Delivery Optimization Files, Recycle Bin, Thumbnails, and temporary files; the exact list may vary by build and system.
- 4.Click the Remove files button.
Note that a recent update (KB5074105) has changed the scan to run in a non-elevated context, which may prevent it from detecting or offering certain admin-restricted items like Windows Update files and device drivers. For those, the classic Disk Cleanup tool is recommended.
Empty the Recycle Bin
It’s important to remember that deleting files in File Explorer does not immediately free up space. Instead, those files remain in the Recycle Bin until you choose to empty it. If you’ve been deleting files but haven’t noticed an increase in free space, this is likely the reason.
To reclaim that space, right-click the Recycle Bin and select Empty Recycle Bin. Additionally, enabling Storage Sense can automate this process on a schedule.
Find and Move Large Personal Files
Typically, videos, music, and photos occupy the most space on your system drive. Identifying and relocating the largest files can significantly free up space on C:.
- 1.Open File Explorer and select This PC.
- 2.Access Videos, Music, Pictures, or Downloads.
- 3.Switch to View > Details and sort by Size to highlight the largest files.
- 4.Delete any files you no longer need, or cut and paste them onto an external USB drive or SD card.
- 5.Don’t forget to empty the Recycle Bin afterward to ensure the space is reclaimed.
Uninstall Apps You No Longer Use
Unused applications can quietly consume valuable disk space. There are three methods to uninstall them, depending on the application.
- Settings: Navigate to Start > Settings > Apps > Installed apps, locate the app, select More (the three-dot menu), and then click Uninstall.
- Start menu: Open Start, find the app, right-click it, and select Uninstall.
- Control Panel: For applications that cannot be removed via Settings, access Control Panel > Programs > Programs and Features, right-click the program, and select Uninstall (or Uninstall/Change).
Turn On Storage Sense for Automatic Cleanup
Storage Sense automates routine cleanups, preventing your drive from gradually filling up again.
- 1.Go to Start > Settings > System > Storage.
- Set the Storage Sense toggle to On.
With default settings, it activates when the device is low on disk space, clears unnecessary temporary files, and empties the Recycle Bin after a specified period. By default, it does not affect your Downloads folder or OneDrive files unless configured to do so, and it operates solely on the system drive (typically C:).
Configure the Storage Sense Schedule
By default, Storage Sense activates only during periods of low free disk space. For regular automatic cleanups, you can adjust the schedule.
- 1.Go to Start > Settings > System > Storage > Storage Sense.
- 2.Utilize the sections for Cleanup of temporary files, Automatic User content cleanup, Locally available cloud content, and Cleanup schedules.
- 3.Set the run frequency to one of During low free disk space, Every day, Every week, or Every month.
- 4.Determine how long items remain in the Recycle Bin before deletion and how long unopened files stay in Downloads before deletion (Microsoft allows a 0 to 365 day threshold).
- 5.Set the duration before unopened OneDrive content becomes online-only (the Windows 11 22H2 default is 30 days).
Use the Classic Disk Cleanup for System Files
The classic Disk Cleanup tool (cleanmgr) remains available in Windows 11 and operates with elevated permissions, allowing it to remove items that the Settings scan now overlooks, such as Windows Update files. In current Windows 11 versions, launching it from a drive’s Properties may redirect you to the Settings app, making it simpler to open the tool directly.
- 1.Type “disk cleanup” in the taskbar search box and select it from the results, or press Windows key + R, type cleanmgr.exe, and hit Enter.
- 2.Select the drive to clean (for instance, C:) and click OK.
- 3.Check the file categories you wish to remove, such as Downloaded Program Files, Temporary Internet Files, Thumbnails, Recycle Bin, and Temporary files.
- 4.Select the Clean up system files button to reveal additional categories.
- 5.After rescanning, options such as Windows Update Cleanup, Previous Windows installation(s), and System error memory dump files will appear.
- 6.Click OK, then confirm with Delete Files.
Be mindful that deleting previous Windows versions is irreversible, similar to the Cleanup recommendations route.
Free Up Local Space with OneDrive Files On-Demand
If you sync OneDrive, your cloud files may be stored locally, consuming disk space. Files On-Demand allows you to keep them in the cloud while still making them visible in File Explorer.
- 1.Ensure you are signed into OneDrive.
- 2.Select the OneDrive cloud icon in the notification area, then the OneDrive Help & Settings icon > Settings > Sync and back up tab > Advanced settings, and toggle on Files On-Demand.
- 3.In File Explorer, right-click a file or folder and select Free up space to convert it to online-only. The file will remain in the cloud.
Status icons will indicate the local storage status: a blue cloud means online-only (no local space used), a green outline circle with a white check indicates downloaded and locally available, and a solid green circle with a white check signifies Always keep on this device. Files marked as Always keep on this device are exempt from Storage Sense and will not convert automatically. In Windows 11 22H2 and later, cloud files will automatically become online-only if not accessed for more than 30 days.
Redirect Where New Content Is Saved
To prevent the system drive from filling up again, configure new files to be saved to a different drive.
- 1.Go to Start > Settings > System > Storage > Advanced storage settings.
- 2.Select Where new content is saved.
- 3.For each content type (apps, documents, music, photos, and videos), choose an alternate drive.
Use External Storage to Install a Stuck Update
Feature updates typically require between 6 GB to 11 GB or more of free space, while quality updates need around 2 GB to 3 GB. If your drive is too full, Windows will notify you of the additional space required.
- 1.First, free up internal space using Cleanup recommendations and Storage Sense via Start > Settings > System > Storage.
- 2.Connect an external USB drive with at least 10 GB of free space.
- 3.In Windows Update, select the option to resolve the issue. This will launch a tool that utilizes the external storage to complete the update.
Rule Out Malware
If disk space continues to disappear without a clear explanation, malware could be the culprit. Running a Windows Security antivirus scan can help rule out this possibility.
Frequently Asked Questions
Why does my free space not increase after I delete files?
When you delete files in File Explorer, they are moved to the Recycle Bin. The space is not reclaimed until you empty the Recycle Bin, so be sure to do this after deleting files.
Is it safe to delete the previous Windows installation (Windows.old)?
This action can safely recover several gigabytes, but it is irreversible: deleting it removes your ability to revert to the earlier Windows version. This option is available for only 10 days post-upgrade, after which Windows will automatically remove it.
Why does opening Storage settings now ask for admin access?
Following the KB5074105 update, Windows displays a User Account Control prompt when accessing Storage settings. This measure is intended to ensure that only authorized users can access system files.
Why can’t the Settings Temporary files tool remove Windows Update files anymore?
After the KB5074105 update, the scan runs in a non-elevated context, which prevents it from detecting certain admin-restricted items like Windows Update files and drivers. The classic Disk Cleanup (cleanmgr) still runs elevated and can remove these items.
Does Storage Sense clean my other drives too?
No, Storage Sense operates solely on the system drive (usually C:). For other drives, you will need to manage them manually via Start > Settings > System > Storage > Advanced storage settings > Storage used on other drives.
Will Storage Sense delete my Downloads or OneDrive files automatically?
By default, it does not affect your Downloads folder or OneDrive files unless you explicitly enable those cleanups in the Storage Sense settings. Files marked as Always keep on this device are always exempt from automatic deletion.
