How to find what is taking up disk space with Folder Space Detective

1. Why Windows Storage and File Explorer only get you part of the way

Settings → System → Storage is useful for broad categories. File Explorer can sort individual files by size. Folder Properties can calculate a folder total.

The friction starts when the missing space is buried several levels down. Then you end up opening folders, waiting for Properties, comparing totals manually, opening the largest-looking child, and repeating the process.

2. Scan the drive or folder you want to investigate

Open Folder Space Detective, choose the drive or folder, and scan it. The scan is local; file names, paths and results are not uploaded.

You can start at the drive root when you genuinely do not know where the space went, or start at a suspicious folder such as Videos, Downloads, Documents or a project/archive tree.

3. Sort largest-first and follow the space

The fastest workflow is usually:

This is where File Explorer gets tedious: Folder Space Detective keeps the total size of each folder visible instead of making you check them one by one.

4. Use Storage Overview when you want the broad picture too

Folder Space Detective also includes a Storage Overview that groups content into stable categories such as video, audio, images, documents, archives, apps/installers, code/data and other.

That gives you the broad context people often use Windows Storage for, while keeping the same tool available for the detailed folder-level investigation immediately afterwards.

5. Switch from folder comparison to a recursive view

Sometimes the problem is not one giant folder but many large files scattered through a tree. Folder Space Detective can switch between:

• current folder;
• all files and folders below the current location;
• all folders below;
• all files below.

This is useful for questions such as “show me every large archive below this department folder” without opening each subfolder individually.

6. Search the whole tree when you remember part of the answer

The Find field supports AND terms, exclusions, quoted phrases and structured filters, so storage analysis and file search can happen in the same tool.

• .xlsx \finance !.lnk - spreadsheets whose full path includes \finance, excluding shortcuts.
• name:"quarterly report" !path:\archive - quarterly-report matches outside archived folders.
• ext:zip path:\Downloads - ZIP files under a Downloads path.
• type:folder backup - folders matching “backup”.

If you already know the likely extension, folder fragment or project name, this can be faster than continuing to drill through the size tree manually.

7. Clean selected items without making deletion casual

Finding the largest item does not mean it is safe to remove. The Cleanup Guidance column gives each result a conservative classification before you act. Right-click an item and choose Cleanup guidance… when you want the reason and recommended action.

• Usually safe - disposable-looking items such as user temporary files, browser caches and empty ordinary folders; still close apps that may be using them first.
• Review first - downloads, installers, archives and ordinary user/data files where FSD cannot know whether you still need the content.
• Use app/Windows - installed applications, launcher-managed games, AppData and Windows-managed cleanup locations that should be handled by the owning app or Windows tools.
• Protected - system locations where direct cleanup is blocked.
• normal Delete sends selected items to the Windows Recycle Bin;
• permanent deletion requires Shift+Delete and confirmation;
• drive roots and protected Windows/Program Files locations are blocked from normal cleanup;
• reparse points and junctions are skipped during scanning;
• Pro Cleanup Rules can surface rule matches for review before you act.

8. Use Pro indexing when you inspect the same large locations repeatedly

Normal scanning does not require an index. If you revisit the same large roots often, Pro can save local indexes for faster repeat navigation, folder autocomplete and Ctrl+Alt+F Quick Search across all indexed locations.

Optional live monitoring can keep supported indexed roots current while Folder Space Detective is running, and the optional local NTFS Index Service can help catch up changes made while the desktop app was closed.