# Is NotchStar Disk cleanup safe?

> Disk only moves things to the Trash, only inside your home folder and app bundles in /Applications. It refuses the home folder itself and system paths.

Canonical: https://www.notchstar.com/help/is-notchstar-disk-cleanup-safe/
Last updated: 2026-11-04

Published 2026-11-04.

Yes, within limits. The Disk tab only ever moves things to the Trash, never deletes them for good, and every move passes through one check that refuses anything but your own files. Safe here means recoverable, not that every item is worth removing.

## What the check allows

- Things inside your home folder, at least two levels down. Your home folder itself, and top level folders such as Documents and Desktop, are refused.
- Inside `Library`, only what is inside folders such as Caches or Preferences, never those folders themselves.
- App bundles directly inside `/Applications`.

Everything else is refused, including system paths. The check is in one small file, `DiskSafety.swift`, with tests.

## What is safe to clear, by group

| Group | Verdict | What happens if wrong |
|---|---|---|
| App caches | Generally safe | The app is slower once while it rebuilds |
| Logs | Safe | Nothing, unless you wanted an old log |
| Xcode build data | Safe | The next build is a full build |
| Old downloads | Look first | You download it again, if it is still online |
| Duplicates | Safe if you want the oldest kept | The oldest copy stays |
| Apps and leftovers | Your call | Settings and data for that app go to the Trash |

Old downloads and app data are your files, so read the list before you tick it.

## Habits that keep it safe

Quit an app before clearing its cache. Do not empty the Trash for a day, in case something misbehaves. [The Trash step](https://www.notchstar.com/help/notchstar-disk-trash-not-permanent-delete/) explains why that works. For the places on a Mac that no tool should touch, read [the full guide](https://www.notchstar.com/blog/free-up-space-on-your-mac-without-a-cleaner/), and for the whole tool see the [Disk feature page](https://www.notchstar.com/features/disk/).

## Quick answers.

### Can Disk touch system files?

No. Every move to the Trash passes through one check, and anything outside your home folder or an app bundle in /Applications is refused.

### Is clearing app caches safe?

Generally yes. Apps rebuild caches, so they may start a little slower the first time afterwards. Quit the app first if you can.

## Keep reading.

- [Disk space, duplicates, apps and cleanup](https://www.notchstar.com/features/disk/): See free space, find big folders, duplicates and app leftovers, compress media and clean caches from your Mac notch. Everything goes to the Trash.
- [How the NotchStar Disk Trash step works](https://www.notchstar.com/help/notchstar-disk-trash-not-permanent-delete/): Disk moves items to the Trash and never deletes for good. Space only comes back when you empty the Trash yourself in Finder.
- [What the NotchStar Disk scan finds](https://www.notchstar.com/help/what-notchstar-disk-scan-finds/): The Overview scan finds app caches, logs, Xcode build data and downloads untouched for 90 days. It lists them and removes nothing until you choose.
- [How to find what is filling your Mac, and free space safely](https://www.notchstar.com/blog/free-up-space-on-your-mac-without-a-cleaner/): Find what fills your Mac with Finder and Terminal, learn which folders are safe to clear, and what to leave alone. Commands tested, with a 20 minute routine.

## More in Disk and storage.

- [What the NotchStar Disk scan finds](https://www.notchstar.com/help/what-notchstar-disk-scan-finds/): The Overview scan finds app caches, logs, Xcode build data and downloads untouched for 90 days. It lists them and removes nothing until you choose.
- [How the NotchStar Disk Trash step works](https://www.notchstar.com/help/notchstar-disk-trash-not-permanent-delete/): Disk moves items to the Trash and never deletes for good. Space only comes back when you empty the Trash yourself in Finder.
- [How NotchStar finds duplicate files](https://www.notchstar.com/help/find-duplicate-files-notchstar/): Duplicates compares file contents, not names, across six folders. It skips files under 1 MB and hard links, and keeps the oldest copy of each set.
- [How to remove an app and its leftovers in NotchStar](https://www.notchstar.com/help/remove-app-leftovers-notchstar/): The Apps section lists apps with the caches, preferences and logs they leave in Library. Remove sends the app and those files to the Trash.
- [How to compress large videos with NotchStar](https://www.notchstar.com/help/compress-large-videos-notchstar/): Compress finds photos over 2 MB and videos over 50 MB, recompresses them, and keeps the result only if it is under 90 percent of the original size.
- [Why a NotchStar Disk scan can be slow](https://www.notchstar.com/help/why-notchstar-disk-scan-is-slow/): Scans read real files: sizing folders, hashing duplicates and recompressing media all take time on big libraries. Here is what each one does.