Disk & Storage Guide
By Free up disk space on Windows in this order. Open Start, Settings, System, Storage and run Cleanup recommendations, then Temporary files. Turn on Storage Sense so it keeps running. Empty the Recycle Bin and clear old installers from Downloads. If you never hibernate, run powercfg /h off as administrator to drop a file the size of several gigabytes. Then scan the drive with a disk space analyzer to find the large folders Windows groups under Other, and move or delete those.
The low disk space warning shows up. You delete a few things and the bar barely moves. That is normal. The files you can see in File Explorer are rarely the ones filling the drive. Windows Update leftovers, a hidden hibernation file, an old backup folder and a bloated mail archive do more damage than a hundred documents.
This guide goes through the built-in tools first, because they are free and safe and they handle the easy half. Then it shows how to find the other half, the big folders that Settings lumps into Other without saying where they are.
Where Does Disk Space Go on Windows?
A Windows drive fills from five directions. Windows itself grows with every update, keeping old versions of system files until a cleanup removes them. Apps and games are the second, and a couple of modern games can take 100 GB each. Your own files are the third, with video, photos and mail archives at the top. Then come caches: browser data, thumbnails, Delivery Optimization and the Recycle Bin. Last are the hidden system files, above all hiberfil.sys for hibernation and pagefile.sys for virtual memory.
Settings can clear the first and the fourth. Uninstalling handles the second. The third is where people lose time, because Windows shows category totals rather than folder sizes, and that is what the last step fixes.
How Do I Free Up Disk Space on Windows?
Work down the list. Steps one to five use nothing but Windows and take about ten minutes together. Step six is for the space they leave behind.
Run Cleanup recommendations
Open Start > Settings > System > Storage and choose Cleanup recommendations. Windows groups what it can safely remove into temporary files, large or unused files, files already synced to the cloud and apps you have not opened in a while. Tick what you are happy to lose and press Clean up. On a machine that has never been cleaned this alone can return several gigabytes.
Clear Temporary files by hand
On the Storage page click Temporary files. You get a list with sizes: Windows Update Cleanup, Delivery Optimization files, Temporary Internet Files, thumbnails, the Recycle Bin and Downloads. Everything except Downloads is safe to remove. Untick Downloads unless you have already saved what you need from it, then click Remove files.
Turn on Storage Sense so it stays clean
Back on the Storage page, set Storage Sense to On, then open it to pick a schedule. It deletes temporary files when the drive runs low, empties the Recycle Bin after a set number of days and, if you allow it, clears old Downloads too. Microsoft notes it works on the system drive only and needs you signed in and online for more than ten minutes to run.
Empty the Recycle Bin and clear Downloads
Right-click the Recycle Bin on the desktop and choose Empty Recycle Bin. Files you deleted weeks ago are still counted against the drive until you do. Then open Downloads in File Explorer and sort by size. Delete the installers, ISO images and zip files you no longer need. Installers you have already run are the usual culprit.
Switch off hibernation if you never use it
Windows keeps a hidden hiberfil.sys on the C: drive sized to a large share of your memory, so on a 16 GB PC it can be 6 GB or more. If you shut down or sleep rather than hibernate, open Command Prompt as administrator and run powercfg /h off. The file disappears at once. Run powercfg /h on later if you want hibernation back.
Find the big folders Windows does not show
After the steps above, the drive may still be nearly full and Settings will only say Other or Apps. Run a disk space analyzer such as Univik Disk Usage Reporter on the C: drive. It lists every folder by size, draws a treemap and shows the largest files with their paths, so old video exports, a bloated Outlook data file or a forgotten backup folder stand out at once. Delete or move those and the space comes back.
What Is the Other Category in Windows Storage?
Open Settings, System, Storage and Windows draws a bar split into Apps & features, Temporary files, Documents, Pictures and a large grey block called Other. Other is everything Windows could not classify: folders outside your user profile, program data, virtual machine images, old backups, game libraries on the C: drive, mail data files and a great deal more. On a full drive it is often the biggest block, and clicking it tells you nothing.
That is the job a disk space analyzer does. Univik Disk Usage Reporter scans the whole drive rather than only your profile, ranks every folder by size, draws a treemap so the large blocks jump out and lists the biggest single files with their full paths. In our own test on a 952 GB drive holding 12.65 million files it finished in about 53 seconds. You see at once that Other was a 40 GB virtual machine folder or a forgotten Videos\Exports from 2021, and you decide what to do with it. The report can be saved as HTML or CSV, which helps when the drive belongs to someone else.
Nine times out of ten the drive is not full of small things. It is full of two or three folders nobody remembers making. The Windows tools cannot point at them. Once you can see them, the fix takes a minute.
Free Up Disk Space: What Each Step Clears
The same six steps as a table, with where to find each one and what it removes.
| Step | Where | What it clears | Time |
|---|---|---|---|
| Cleanup recommendations | Settings > System > Storage | Temporary files, unused apps, synced files | Two minutes |
| Temporary files | Settings > System > Storage | Update leftovers, caches, Recycle Bin | Two minutes |
| Storage Sense | Settings > System > Storage | Keeps the above cleared on a schedule | Set once |
| Empty Recycle Bin | Desktop | Files already deleted | Seconds |
| Clear Downloads | File Explorer | Old installers and archives | Five minutes |
| powercfg /h off | Admin Command Prompt | The hibernation file, often 6 GB or more | Seconds |
| Disk space analyzer | Univik Disk Usage Reporter | Big folders and files Windows lists as Other | Five minutes |
Univik Disk Usage Reporter looks over a drive or folder and ranks every folder by size, with a treemap and the largest files beside it. One click saves an HTML or CSV report. Free edition, no account, runs on your PC.
Windows 7 to 11 · nothing uploaded · a 1 TB drive scans in under a minute
The short version
- Settings, System, Storage: run Cleanup recommendations, then Temporary files, then switch on Storage Sense.
- Empty the Recycle Bin and clear old installers out of Downloads.
- If you never hibernate, powercfg /h off frees a file the size of several gigabytes.
- Windows shows categories, not folders. The Other block is where the missing space usually hides.
- A disk space analyzer such as Univik Disk Usage Reporter shows the big folders by name so you can move or delete them.
Scan your drive free with Univik Disk Usage Reporter
Disk Space Questions
About This GuideLeena Taylor Paul wrote this guide for Univik, which has developed Windows utilities since 2013. Every Settings path and the Storage Sense behaviour were checked against Microsoft Support in September 2026, and the scan timing comes from our own run on a 952 GB drive. Checked 22 September 2026. Drive still full after all six steps? Ask support through the link below.
Sources: Microsoft: free up drive space in Windows · Microsoft: manage drive space with Storage Sense · Univik Disk Usage Reporter