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A full system drive slows down Windows in ways you notice every day: updates fail to install, games refuse to patch, and even opening File Explorer starts to feel sluggish. The good news is that most PCs are carrying tens of gigabytes of files nobody needs — temporary data, leftover update files, and forgotten downloads that can be cleared out safely in under an hour.
This guide walks through freeing up disk space in Windows 11 and Windows 10 step by step, using only built-in tools plus a couple of smart file moves. Nothing here touches your documents, photos, or installed programs unless you explicitly choose to remove them.
Step 1: See What Is Actually Using Your Space
Guessing wastes time. Windows has a built-in storage breakdown that shows exactly where your gigabytes went.
- Open Settings, go to System, then select Storage.
- Wait a few seconds while Windows scans the drive, then review the category list (Apps, Temporary files, Documents, and so on).
- Click Show more categories to see the full breakdown, including System and Other.
- Note the two or three largest categories — those are where cleanup will actually make a difference.
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Step 2: Clear Temporary Files with Storage Sense and Disk Cleanup
According to Microsoft’s documentation, temporary files — update leftovers, delivery optimization files, and old Recycle Bin contents — are safe to remove and often recover 10–30 GB in one pass.
- In Settings > System > Storage, click Temporary files.
- Tick the categories you want to clear. Windows Update Cleanup and Delivery Optimization Files are usually the largest. Leave Downloads unticked unless you have checked that folder first.
- Click Remove files and let the process finish.
- Back on the Storage page, turn on Storage Sense so Windows repeats this cleanup automatically on a schedule.
- For older Windows 10 builds, search the Start menu for Disk Cleanup, select your C: drive, and click Clean up system files for the same result.
Step 3: Uninstall Unused Apps and Relocate Big Games
Games are the single biggest space consumers on most home PCs, with modern titles regularly exceeding 100 GB each.
- Go to Settings > Apps > Installed apps and sort the list by size.
- Uninstall anything you have not opened in months — you can always reinstall later.
- For games you want to keep, move them to a secondary drive instead of deleting them. Steam has a built-in transfer feature, covered in our guide on how to move Steam games to another drive without redownloading.
- If your PC has a spare M.2 slot, adding a dedicated game drive is a clean fix — see our roundup of the best 4TB NVMe SSDs for high-capacity options.
Step 4: Move Photos, Videos and Archives Off the System Drive
Personal media does not need to live on your fastest drive. Moving it frees space without deleting a single memory.
- Open File Explorer and check the size of your Pictures, Videos, and Downloads folders (right-click, then Properties).
- Connect an external drive and copy large folders across — our walkthrough on how to back up your PC to an external hard drive covers a safe, verifiable process.
- Only delete the originals after confirming the copies open correctly on the external drive.
- If you do not own a suitable drive yet, the best external backup drives guide compares reliable high-capacity options.
Common Mistakes That Make Things Worse
Deleting files from the Windows or Program Files folders. Manually removing system files can break applications or Windows itself. Stick to the built-in cleanup tools, which know what is safe.
Using aggressive registry cleaners. Third-party PC booster utilities rarely free meaningful space and can cause instability. The Storage settings page does everything most users need.
Filling an SSD to 100 percent. Solid-state drives need spare room for background maintenance. If your drive lives permanently above 90 percent full, it is also worth confirming the hardware itself is fine — our guide on how to check SSD health in Windows and macOS shows how in two minutes.
Moving installed programs by dragging their folders. Installed software has registry entries pointing to its original location. Uninstall and reinstall on the new drive, or use the app’s own move feature.
Frequently asked questions
Is it safe to delete everything in the Temp folder?
Yes. Windows recreates temporary files as needed, and both Disk Cleanup and Storage Sense only remove files that are safe to delete. If a temp file is currently in use, Windows simply skips it, so you cannot break anything by running the built-in cleanup tools.
How much free space should I keep on my SSD?
A good rule of thumb is to keep around 10 to 15 percent of the drive free. SSD controllers use spare space for wear leveling and background maintenance, and manufacturer documentation notes that performance can drop noticeably when a drive is nearly full.
Does Storage Sense delete personal files?
No. Storage Sense targets temporary files, the Recycle Bin, and optionally old files in your Downloads folder. It never touches documents, photos, or program files elsewhere on the drive. If you are worried about Downloads, leave that option set to Never in the Storage Sense settings.
What if my drive is still full after cleanup?
If you have cleaned temporary files, uninstalled unused apps, and moved large media off the drive but still run low, the drive is simply too small for your library. Upgrading to a larger SSD and cloning your existing installation over is usually the most practical long-term fix.
