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

OnyX for Mac

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Download OnyX 4.0.0

  -  4.93 MB  -  Freeware

What's new in this version:

- Code optimized
- Deleting the applications caches improved
- Info > Security pane (formerly Protection) improved
- Deleting the diagnostic reports improved
- Issue corrected that occurred when deleting the Recent Items in the Apple menu
- Miscellaneous improvements made
- Help updated, improved, and reindexed

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