What Is Taking Up Space on Your PC? 7 Best Disk Space Analyzers

What Is a Disk Space Analyzer?

A disk space analyzer is a tool that scans a hard drive or SSD to show how storage space is used by files and folders. It helps you identify large files, space-consuming folders, and potential storage issues so you can manage disk space more efficiently.

Some disk space analyzers display results in a visual chart or treemap, making it easier to spot large items at a glance. Windows also provides built-in storage tools, while dedicated programs such as MiniTool Partition Wizard Space Analyzer offer more detailed file and folder analysis.

By identifying what takes up the most space on your drive, you can decide which files to move, archive, or safely delete to free up storage.

MiniTool System Booster TrialClick to Download100%Clean & Safe

7 Best Disk Space Analyzers for Windows 11/10

Here are seven disk space analyzers worth considering, depending on your storage needs, budget, and preferred way of viewing disk usage.

#1. Windows Storage — Best Built-in Disk Space Analyzer

Windows Storage is a convenient starting point if you want to check disk usage without downloading third-party software. It organizes storage information into categories, helping you identify whether applications, temporary files, documents, or other content are consuming the most space.

Key features:

• View storage usage by category.
• Review temporary files and Windows cleanup recommendations.
• Configure Storage Sense to help manage eligible files automatically.
• Access storage management directly through Windows Settings.

Best for: Users who need a quick overview of disk usage and want to use Windows’ built-in cleanup features.

How to use it: Open Settings > System > Storage and select the relevant storage category to investigate what is using space. Menu labels may vary slightly by Windows version.

#2. MiniTool Partition Wizard Space Analyzer — Best for Integrated Disk Management

MiniTool Partition Wizard is a Windows disk management tool that includes a Space Analyzer feature for examining disk usage. It helps users scan a drive and identify large files and folders that may be taking up valuable storage space.

Key features:

• Scan a selected drive to analyze disk usage.
• Browse file and folder sizes in Tree View, File View, and Folder View.
• Sort results to identify space-consuming items.
• Use its disk and partition management features alongside storage analysis.

Best for: Windows users who want to investigate disk usage and access additional partition management features in one program.

How to use it: Launch MiniTool Partition Wizard, open Space Analyzer, select the drive you want to examine, and start scanning. Review the results to find large files and folders before deciding how to manage them.

#3. WinDirStat — Best Free, Open-Source Disk Space Analyzer

WinDirStat is a free, open-source disk usage analyzer for Windows. It combines a directory tree, file-type statistics, and an interactive treemap to help users understand how storage is distributed across a drive.

Key features:

• Visualize disk usage with an interactive treemap.
• Explore directory sizes and file types.
• Identify large files and investigate space-consuming folders.
• Analyze selected drives and folders.

Best for: Users who prefer open-source software and visual representations of disk usage.

Limitation: The interface may take some time to learn, especially for users unfamiliar with treemaps and directory statistics.

#4. TreeSize Free — Best for Folder-by-Folder Analysis

TreeSize Free is a Windows disk space analyzer designed for users who prefer a familiar hierarchical folder view. It helps you identify large directories and drill down into subfolders to see where storage is being consumed.

Key features:

• Scan drives and inspect folder sizes.
• Sort folders to find major storage consumers.
• Explore disk usage through hierarchical views and supported visualizations.
• Navigate from broad storage summaries to individual files.

Best for: Users who want a straightforward folder-by-folder breakdown of disk usage.

Limitation: Some advanced reporting and analysis capabilities are reserved for paid editions. Check the current license terms if you plan to use it commercially.

#5. WizTree — Best for Fast Local Disk Scans

WizTree is a disk space analyzer designed to locate large files and folders quickly. On supported local NTFS volumes, it can read the NTFS Master File Table (MFT) directly, which can make scanning considerably faster than conventional file-by-file enumeration.

Key features:

• Analyze disk usage and locate large files.
• Browse folder and file lists alongside a visual treemap.
• Search for files and investigate potential duplicates.
• Export supported scan results for further analysis.

Best for: Users who want to quickly identify large files on a local NTFS drive.

Limitation: Its speed advantage depends on the drive’s file system and scan method. WizTree is free for personal use, but commercial use requires checking the applicable paid license.

#6. SpaceSniffer — Best for Interactive Disk Visualization

SpaceSniffer is a portable disk space analyzer that uses a treemap to display how files and folders occupy storage. Larger rectangles represent larger items, making it easier to spot major storage consumers visually.

Key features:

• Explore disk usage through an interactive treemap.
• Zoom into folders to investigate their contents.
• Filter results to narrow down the items you want to inspect.
• Run the portable application without a conventional installation.

Best for: Users who prefer visual exploration and want a lightweight, portable tool.

Limitation: Its visual interface may be less convenient than a traditional folder list for users who prefer detailed tabular reports.

#7. DiskSavvy — Best for Disk Usage Classification and Reporting

DiskSavvy is a disk space analysis tool that focuses on classifying and analyzing files across storage locations. Depending on the edition, it offers features for examining storage usage and producing reports.

Key features:

• Analyze file and folder storage usage.
• Classify files according to supported criteria.
• Review storage distribution and analysis results.
• Access additional reporting capabilities depending on the edition.

Best for: Users who need more structured storage analysis or file classification than a basic storage overview provides.

Limitation: Features and licensing vary by edition, so review the current product documentation before choosing a version.

How Much Free Space to Leave on HDD/SSD

By using the hard drive space analyzers above, you know how to check hard drive space on Windows 10 and then take alone the large file to delete or transfer them to another location to keep disk utilization within a reasonable range.

At this time, you may wonder: “How much disk space should I leave on a hard drive so as to reach a reasonable condition?”

Before cutting to the point, you need to know why free space is necessary.

If your hard drive keeps filling up, you won’t be able to save new files or allow any Windows Updates to keep computer better protected. Programs often need some free space to create cache files. If there is not enough free space left, they may crash or experience other errors.

Generally speaking, once a hard drive is almost 80% full, you should consider it’s full and immediately delete some files or move some files to another hard drive. After all, enough free space will ensure your computer has excellent performance.

But sometimes you may just want to keep all the files on the hard disk drive. No deletion and no transferring. In this case, upgrading to a larger HDD/SSD is worth considering.

Best Disk Cloning Software: Clone HDD, SSD, and Windows OS

Download the best hard drive cloning software to clone HDD to SSD, migrate Windows, and transfer all data safely. Learn how to clone a hard drive step by step.

Read More

What Is Taking Up Space on Your PC? 7 Best Disk Space AnalyzersClick to Tweet

Sum up

Reading here, I guess you already know how to figure out what’s taking up space on Windows 10/8/7 as well as get the best way to upgrade hard drive if you want no deletion. With MiniTool Partition Wizard Free, both are too easy.

Now it is your turn to try them out. Just tell me how do you feel by following this guide focusing on how to see what’s taking up space on Windows 10. For any questions while using MiniTool software, don’t hesitate to contact us via [email protected].