You can use to verify the startup disk and the structure of its system files

OnyX for Mac

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Download OnyX 2.7.1

  -  22.4 MB  -  Freeware

What's new in this version:

- Bug corrected in the Utilities > Applications pane
- Keyboard Viewer in the Utilities > Applications pane
- The opt folder can be shown/hidden now from the Utilities > Visibility
- New replacement icon

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