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

OnyX for Mac

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Download OnyX 3.6.6

  -  5.5 MB  -  Freeware

What's new in this version:

- To use OnyX, you must allow it to access data using the Full Disk Access feature
- Reading parameters improved
- New option: Turn on/Turn off the Info menu in the login window
- Restart routine improved
- Info pane improved

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