Windows storage education
Understand What's Taking Up Your Disk Space
Explore practical Windows storage guides, understand disk usage visualizations, and learn how to identify large files and folders.
Educational guides and simulated browser tools. This site does not distribute software.
Simulated treemap of a sample drive, largest first: Videos 64 GB, Applications 48 GB, Backups 36 GB, System Data 28 GB, Pictures 22 GB, Downloads 18 GB, Documents 12 GB. This drawing does not read a computer.
Understand Your Storage
Three places to start, depending on whether you want the method, the Windows steps, or the reasons a drive fills up.
Analyze Disk Usage
See how a scan walks folders, adds file sizes, and turns that total into a result you can read.
Learn how it works 02Find Large Files
Use Storage settings and File Explorer on Windows 11 to locate heavy folders you actually recognize.
Follow the Windows steps 03Resolve Storage Problems
Trace a full volume, temporary files, restore points, and numbers that do not match a folder window.
Review storage problemsHow Disk Analysis Works
Every useful storage picture is built from the same three moves. The guides unpack each one.
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Walk the folder tree
A scan starts at a drive or a folder and lists what it is allowed to open, then repeats inside each folder.
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Add the sizes
Each file contributes its recorded size. Each folder becomes the total of the files and folders found inside it.
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Show the shape of the total
A table, a capacity bar, or a treemap draws those totals so the largest folders are easy to pick out.
Explore Disk Usage Visually
In a treemap, area stands for size. On this sample drive, Videos occupy the largest block. Position on the page is only a layout choice.
The rectangles use one fixed dataset of 228 GB. They teach the picture. They do not inspect the PC you are using.
Read the labels, then compare them with the written sizes in the visualizer guide.
Interactive Storage Tools
Three browser tools for practice. Each one works from sample data or from numbers you type.
- Try the interactive tool
Interactive disk treemap
Open sample folders and check that a larger rectangle matches a larger listed size.
- Use the calculator
Storage usage calculator
Enter capacity, used space, and a planned addition to see what would remain.
- Convert a file size
File size converter
Convert decimal GB and binary GiB units, including KB through TB and KiB through TiB.
Practical Windows Storage Guides
Shorter reads for cleanup choices, for reading a storage picture, and for comparing analyzer approaches.
- Read the cleanup guide
Free space with a review, not a guess
Storage Sense, temporary files, and personal folders, with system locations left untouched.
- Read the visualizer guide
Read a disk space picture
What rectangle area, nesting, and color mean, and the mistakes that send people to the wrong folder.
- Read the comparison
Compare analyzer approaches
Windows views, treemaps, and folder lists, without invented speed scores or rankings.
Common Questions
Does SpaceSanifferDo scan my computer?
These pages do not scan your computer. The treemap uses a built-in demonstration dataset. The calculator and converter use only numbers you type. None of the tools read your drives.
Is this the official SpaceSniffer website?
SpaceSanifferDo is an independent educational project. It is not the official SpaceSniffer website, it is not affiliated with that developer, and it does not offer that software for download.
Why can a folder list disagree with free space?
Storage settings report the whole volume. A folder window adds up the files that account can see. Hidden files, restore points, reserved storage, cloud placeholders, and hard links can all change the two numbers.
What is a careful first step when a drive is full?
Open Settings, then System, then Storage, and read the categories before deleting anything. Review temporary files and personal folders you recognize. Leave unknown Windows system folders alone.