Low storage space available?

Is your computer running slow due to low disk space? This comprehensive guide will show you exactly how to free up disk space on your Windows PC. Whether you’re trying to clear space on your C drive or looking to optimize your system storage, we’ll cover proven methods to reclaim valuable disk space and improve your computer’s performance.

Oct 16, 2025 0 5

What is Disk Space and Why Does it Matter?

Disk space refers to the total storage capacity available on your hard drive. When your disk space gets too full (typically over 85% capacity), your computer’s performance can significantly decline. Here’s why managing your disk space is crucial:

Prevents system slowdowns and crashes
Ensures smooth Windows updates
Maintains optimal computer performance
Provides space for temporary files and virtual memory
Allows proper program operation

Understanding disk space is essential for maintaining your computer’s health. Your hard drive needs adequate free space to perform routine operations, create temporary files, and maintain system performance. When disk space runs low, your computer may experience:

Slow startup and shutdown times
Difficulty installing updates
Program crashes
File saving errors
System instability

How to Check Your Available Disk Space

Before you start freeing up space, it’s important to know how much disk space you currently have. This initial assessment will help you understand the scope of your storage situation and set appropriate goals for cleanup.

Here’s how to check your available disk space:

Open File Explorer (Windows key + E)
Click on “This PC” in the left sidebar
Look at your C: drive to see available space
For detailed information, right-click the drive and select “Properties”

You’ll want to ensure you have at least 15-20% of your total disk space free for optimal performance. If you’re below this threshold, it’s time to start implementing the cleanup methods below.

1. Use Windows Disk Cleanup Tool

The Disk Cleanup utility is Windows’ built-in tool to free up disk space. This powerful utility can help you remove unnecessary files that accumulate during normal computer use. These files often include temporary internet files, downloaded program files, and offline webpages that you no longer need.

Follow these steps to use Disk Cleanup effectively:

Type “Disk Cleanup” in the Windows search bar
Select your system drive (usually C:)
Click “OK” to scan for files
Click “Clean up system files” for a more thorough cleanup
Select files to remove:
- Temporary Windows installation files
- Windows update cleanup
- System error memory dump files
- Windows Defender antivirus
- Temporary Internet Files
- Delivery optimization files
- DirectX shader cache
- System created Windows Error Reporting
- Temporary files

After selecting the files to remove, click “OK” to begin the cleanup process. This may take several minutes, depending on the amount of data being removed.

2. Empty the Recycle Bin

The Recycle Bin serves as a safety net for deleted files, but it can also become a significant source of wasted disk space. Files in the Recycle Bin continue to occupy space on your hard drive until you permanently delete them.

To free up disk space from the Recycle Bin:

Right-click the Recycle Bin on your desktop
Select “Empty Recycle Bin”
Confirm the deletion

Pro tip: Before emptying the Recycle Bin, take a moment to review its contents. Sort files by size to quickly identify large files and verify that you won’t need them again. Remember that once you empty the Recycle Bin, these files cannot be recovered without specialized software.

3. Uninstall Unnecessary Programs

Over time, your computer accumulates programs that you no longer use or need. These applications take up valuable disk space and might even run background processes that slow down your system. Removing them can free up significant space on your hard drive.

Follow these steps to remove unnecessary programs:

Open Settings > Apps > Apps & Features
Sort by size to identify space-hungry applications
Click on programs you don’t need
Select “Uninstall”
Follow the uninstallation wizard

When evaluating which programs to remove, consider these categories:

Common programs to consider removing:

Old games you no longer play
Trial software that’s expired
Outdated utilities and tools
Duplicate programs with overlapping functions
Pre-installed bloatware
Old media players or file converters
Previous versions of programs
Unused language packs

Remember to restart your computer after uninstalling multiple programs to ensure all changes take effect properly.

4. Clear Temporary Files

Temporary files are created by both Windows and applications to store data temporarily while performing tasks. While these files are meant to be deleted automatically, they often accumulate over time and can consume significant disk space.

Here’s a comprehensive approach to clearing temporary files:

Press Windows key + R
Type “%temp%” and press Enter
Select all files (Ctrl + A)
Press Delete
Skip files that are in use

Additional temporary file locations to check and clean:

Windows Temp folder (C:\Windows\Temp)
Browser cache and temporary files
Downloaded program files
Windows update cache
Thumbnail cache
Error reporting files
DirectX shader cache
Delivery optimization files

To ensure a thorough cleanup, consider clearing application-specific temporary files as well:

Browser Cache:

Chrome: Settings > Privacy and security > Clear browsing data
Firefox: Options > Privacy & Security > Clear Data
Edge: Settings > Privacy, search, and services > Clear browsing data

5. Enable Storage Sense

Storage Sense is a built-in Windows feature that automatically manages your disk space by removing unnecessary files when your system is running low on storage. This automated tool helps maintain free disk space without requiring manual intervention.

Follow these steps to configure Storage Sense:

Open Settings > System > Storage
Toggle on “Storage Sense”
Click “Configure Storage Sense or run it now"
Set up automatic cleaning:
- Choose how often to run
- Configure temporary file deletion
- Set up cloud content handling
- Manage downloads folder cleanup

Advanced Storage Sense settings allow you to:

Delete files in the Downloads folder after specified days
Delete files in the Recycle Bin after specified days
Delete files in the Windows Apps temp folders
Move files to OneDrive when disk space is low

6. Move Files to External Storage

When internal disk space is limited, moving files to external storage provides an excellent solution for freeing up space while keeping your files accessible. This method is particularly useful for large files that you don’t need to access frequently.

Follow this process to effectively manage external storage:

Connect an external hard drive
Identify large files:
- Videos and movies
- Photo collections and raw images
- Music libraries
- Document archives
- Virtual machine files
- Backup files
Move selected files to external storage
Verify the transfer before deleting originals

Best practices for external storage:

Label drives clearly
Use folders to organize content
Keep a backup of critical files
Test files after transfer
Safely eject drives before disconnecting

7. Use Cloud Storage Services

Cloud storage offers a flexible solution for freeing up disk space while keeping your files accessible from any device. Modern cloud services provide generous storage options and intelligent syncing capabilities to help manage your local disk space effectively.

Popular cloud storage options include:

OneDrive (integrated with Windows)
Google Drive
Dropbox
iCloud
Box
Amazon Drive

Best practices for cloud storage:

File Selection:
- Store frequently accessed files
- Upload large media collections
- Back up important documents
- Share collaborative files
Optimization Settings:
- Enable file on-demand features
- Use selective sync
- Configure automatic backup
- Set offline file preferences
Management Strategies:
- Regular cleanup of cloud storage
- Monitor storage quotas
- Remove duplicate uploads
- Archive unused files

8. Manage System Restore Points

System restore points provide a way to revert Windows to a previous state if problems occur. However, these restore points can consume significant disk space over time. Managing them effectively can help free up valuable storage while maintaining system protection.

Follow these steps to manage restore points:

Open System Properties (Windows key + Pause)
Click “System Protection”
Select your system drive
Click “Configure”
Adjust space usage or disable if needed
Delete old restore points to free up space

Consider these settings for optimal balance:

Keep 2-3 recent restore points
Allocate 2-5% of disk space for System Protection
Create manual restore points before major changes
Remove older restore points regularly

9. Disable Hibernation

Hibernation is a power-saving feature that saves your current system state to the hard drive, allowing you to resume work exactly where you left off. However, this feature requires significant disk space to store the hibernation file.

Steps to manage hibernation:

Open Command Prompt as administrator
Type “powercfg /hibernate off”
Press Enter
Restart your computer

Before disabling hibernation, consider:

Your typical usage patterns
Battery life requirements
Startup time preferences
Available disk space

Note: Disabling hibernation will remove the hiberfil.sys file, which can free up several gigabytes of space, but you’ll lose the ability to hibernate your computer.

10. Use Disk Space Analysis Tools

Disk space analysis tools provide detailed insights into how your storage is being used, helping you identify large files and folders that may be unnecessary. These tools can visualize your disk usage and make it easier to find cleanup opportunities.

Popular disk analysis tools include:

WinDirStat
TreeSize
SpaceSniffer
DiskAnalyzer Pro
FolderSize

Follow these steps for effective disk analysis:

Download a reputable disk space analyzer
Scan your drive thoroughly
Identify large files and folders
Remove unnecessary items
Track disk space usage over time

Key features to look for in analysis tools:

Visual disk map
File and folder sizing
Age of files
File type distribution
Export capabilities

Conclusion

Multiple Windows features and processes require free disk space to be available for them to function properly. Even though each of those may require 10 to 20% of space for its operation, that doesn’t mean that you have to add up those percentages and keep 60 to 80% of your drive free of files and unused. After all, what’s the point of having a large drive if you can’t save anything to it?

You have to understand that most of these needs are temporary. For instance, when files are defragmented, a lot of free space may be required to write big files to, but when pieces of those files are moved to the new consecutive spots, the space they previously occupied becomes free and available for other files or operations. Another example: the paging file is created while you are actively using your computer and is cleared when you reboot, so the space it previously occupied becomes free. All you need to do is try not to let those free space needs occur simultaneously, such as not launching defragmentation when you have several resource-hungry applications open and active.

But, no matter how hard you try not to let those processes overlap, it will still happen now and then. Therefore, the amount of disk space you should keep free is a bit larger than what’s required by the neediest of the features we described above. Based on our research and the tests we’ve run on a few of our in-house test machines, we can conclude that, for most users, keeping a minimum of about 25% of the drive’s total capacity free ensures optimal system performance without freezes, glitches or ‘insufficient disk space’ messages.