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

OnyX for Mac

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Download OnyX 3.9.4

  -  3.25 MB  -  Freeware

What's new in this version:

- Option to turn on/turn off the startup sound deleted (already present in System Preferences > Sound > Sound Effects)
- Option to change the image background of the login window deleted
- Minor modifications made
- Help updated and reindexed

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