What is taking up space on your Windows drive
Find out what is taking up space on your Windows drive using built-in tools only, and which of it is genuinely safe to delete rather than merely deletable.
Written by the team building Quick File Organizer, folders that organize themselves, by your rules.
What is taking up space on a full drive is usually four or five things, not a thousand. Windows can tell you which, and you do not need to install anything to find out.
The harder question is what is safe to remove — because several of the biggest folders on any Windows drive must be left exactly where they are.
Start with the built-in breakdown
Settings → System → Storage
Windows shows a category breakdown: Apps, Temporary files, Documents, Pictures, and so on. Click Show more categories for the full list.
This is enough to identify the culprit about 80% of the time. Click into any category to see what is inside it.
What is taking up space, usually
| Culprit | Typical size | Safe to remove? |
|---|---|---|
| Temporary files | 5–30 GB | Yes — via Storage settings |
| Previous Windows installation | 10–30 GB | Yes, after 10 days |
| Downloads folder | 5–50 GB | Your call — check first |
| Recycle Bin | 1–20 GB | Yes, if you are sure |
| Hibernation file | 4–16 GB | Only if you never hibernate |
| System Restore points | 5–20 GB | Reduce, do not disable |
| WinSxS | 5–10 GB | No — see below |
| Page file | 2–16 GB | No |
Windows.old
After a feature update, Windows keeps your previous installation for ten days so you can roll back. It is often 20 GB or more.
Settings → System → Storage → Temporary files → Previous Windows installation(s)
Safe to remove once you are confident the update is fine. It deletes itself after ten days anyway.
Safe cleanup, in order
Temporary files
Settings → System → Storage → Temporary files. Tick everything except Downloads, then remove. This is the safest large win available.
Empty the Recycle Bin
Check it first — it is a Recycle Bin, and people do go looking.
Uninstall what you do not use
Settings → Apps → Installed apps, sorted by size. Games and creative tools are usually the biggest entries by a wide margin.
Run component cleanup
The DISM command above, for the WinSxS folder. It takes a while and needs no supervision.
Then look at your own files
Downloads, Pictures, and video folders. This is where the remaining space is, and it is the part only you can judge.
Storage Sense, with one caveat
Storage Sense automates most of the above and is worth turning on — except for its Downloads rule, which deletes files you deliberately saved, permanently, without passing them through the Recycle Bin.
Set that specific dropdown to Never. The full explanation is here, including how to check whether it has already taken something.
When the answer is "your own files"
Very often the breakdown shows nothing dramatic — the drive is simply full of things you saved and never sorted. Duplicated photo imports, six copies of the same installer, a Downloads folder measured in gigabytes.
Part of a wider system for organizing files on Windows.
If Downloads turned out to be one of the culprits, the durable fix is not a one-off delete: changing the Downloads folder location moves the problem off the system drive, and organizing the folder stops it rebuilding.