Start in Settings > System > Storage to identify the category using your disk. Use File Explorer to sort files in a familiar folder by size. When the space is spread across many folders, a visual disk map helps you trace it back to its source.
Open Settings > System > Storage. Review the categories before deleting anything. Installed apps, temporary files, and personal files need different cleanup decisions.
Open Cleanup recommendations to review Windows' suggested candidates. Read each selection, especially Downloads and the Recycle Bin. Storage Sense can automate some cleanup, so check its settings before enabling it. For system-managed temporary files, use these Windows controls instead of manually deleting folders inside C:\Windows.
Microsoft's drive-space guide explains the available cleanup options. To uninstall an app, use Settings or its uninstaller; removing its program folder can leave the installation broken.
02 Sort familiar files in File Explorer
Press Windows+E and open Downloads, Videos, or a specific project folder.
Choose View > Details. Select the Size column heading to sort files, then select it again if the largest files are at the bottom.
Look at the file's name, type, location, and modification date. Open or preview files you recognize before deciding whether another copy is needed.
Repeat inside likely subfolders. Explorer's normal Size column describes files; it does not sum every nested folder into a comparable folder total.
For example, a folder might contain no single large file but hold hundreds of video exports. Sorting only its top level will not explain that total. This is a workflow example, not a measured storage result.
A disk map is useful when you need folder totals and a view of the hierarchy. In the Delve Windows preview, scan the relevant folder, compare Treemap or Sunburst with Files, then inspect the path behind a large region. Largest Files helps with individual outliers; the folder view helps with collections.
Begin with a folder you can read. Administrator access may reveal more of a local drive, but it does not make every result complete or every file safe to remove. Review scan warnings before treating a total as the whole disk. Use the owning application to manage game libraries, mail archives, virtual disks, and backups.
A file's displayed size can describe content stored in OneDrive, even when it is not taking up that amount of local disk space. Check the Status icons in Explorer. A blue cloud indicates an online-only file; opening it downloads its contents.
To keep a synced file in OneDrive while releasing its local copy, use OneDrive's Free up space action. Deleting a synced file is different: that deletion can propagate to OneDrive and other devices. Check that syncing has completed and that you understand the file's status first.
Back up files you may need again. Start with personal files you recognize, such as old installers or redundant exports.
Move a small, reviewed selection to the Recycle Bin. Some locations cannot recycle files; stop and read any permanent-deletion warning.
Check that the relevant project or application still works. Empty the bin only when you are ready to make removal permanent.
Return to File Explorer > This PC and compare available space on the same drive. Rescan if you need a new folder breakdown.
Compressed files, sparse files, hard links, cloud placeholders, and files still in the Recycle Bin can make file totals differ from recovered space. Avoid deleting unfamiliar system or application data just because it ranks highly.
If free space quickly falls again, look for the process producing new data: repeated downloads, game updates, exports, or a growing application cache. Removing one batch will not fix the source of continued growth.