Warning
Create a Time Machine backup before major updates, disk operations, or security changes on macOS.
What you will achieve
Repair common disk and permission issues from macOS or Recovery.
1) Run First Aid from normal boot or Recovery
- Open Disk Utility and choose View → Show All Devices.
- Run First Aid on container, then volume, then startup disk.
2) If startup disk is in use
Boot into Recovery and run First Aid again for a deeper repair attempt.
3) Escalate if errors persist
Persistent APFS corruption may require data backup and erase/reinstall.