What Settings, Storage shows you, and the two things it hides
The built in storage screen is better than it gets credit for and it still cannot show you a folder. Where it helps and where it stops.
Before installing anything, open Settings, System, Storage. It is genuinely useful, it has improved a great deal, and knowing precisely where it stops saves you from concluding your drive is haunted.
What it is good at
- Temporary files, itemised. Update caches, previous installations, error reports and the Recycle Bin, each with a size and a tick box.
- Apps and features, sorted by size. The fastest way to find the game you installed once.
- Storage Sense. A schedule for the recurring part, which is the one setting worth turning on.
- Per drive. Every volume, not just C, which matters more on Windows than on a Mac.
Where it stops
| Question | The storage screen | What answers it |
|---|---|---|
| What is in Other? | A size, no way in | A tool that walks folders |
| Which folder is biggest? | Never shows folders | A disk map, or PowerShell |
| What is in System and reserved? | A rough breakdown | Understanding each part separately |
| Why did the number not drop? | No answer | Shadow copies and the Recycle Bin |
System and reserved, unpacked
The category people stare at is System and reserved, and it is not one thing. It is Windows itself, the hibernation file, the page file, System Restore and reserved storage, which Windows sets aside so updates always have room to install. Each has its own page here because each has a different answer.
Reserved storage specifically
DISM /Online /Get-ReservedStorageStateReserved storage is a few gigabytes Windows holds back so a feature update never fails for want of space. It can be turned off with DISM, and doing so means an update can fail for want of space, which is precisely the problem it exists to prevent. It is rarely the right trade.
The honest summary
Use it first. It finds temporary files, large apps and previous installations faster than anything else, and Storage Sense handles the recurring chore. Reach for something that shows folders when the answer is not in any of its categories, which on a full drive is more often than it should be.
Common questions
What is System and reserved in Windows storage?
Several different things counted together: Windows itself, the hibernation file, the page file, System Restore and reserved storage held back for updates. Each is a separate problem with a separate answer.
What is the Other category in Windows storage?
Everything that fits none of the named categories. There is no drill down, which is why a large Other figure sends people looking for a tool that shows folders.
Can I turn off reserved storage?
Yes, with DISM /Online /Set-ReservedStorageState, and it reclaims a few gigabytes. It also means a feature update can fail for want of space, which is exactly what it exists to prevent.
Is Storage Sense worth turning on?
Yes for temporary files and the Recycle Bin, which is the recurring part of keeping a drive clear. Be deliberate about the option that deletes Downloads by age.