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Fusion data structures are invalid - 3TB Fusion Drive on macOS Catalina

I failed to update macOS 10.15.1 to macOS 10.15.2 on my late 2012 iMac i7 with a 3TB Fusion Drive. The issue persists after I restored my Mac from Time Machine. When I run First Aid to repair my Fusion Drive, it says, "Fusion data structures are invalid. The volume /dev/rdisk3s5 could not be verified completely. File system check exit code is 8. Restoring the original state found as mounted. File system verify or repair failed. : (-69845)." Note that my Fusion Drive is still complete. Any help is appreciated!

Best Answered by

iBoysoft author Jenny Zeng

Jenny Zeng

Answered on Monday, February 19, 2024

The error "Fusion data structures are invalid" indicates a file system issue with the fusion data structure. To fix it, split your Fusion Drive and recreate it. Ensure you back up your Mac before proceeding, as the process below will remove all data on your drives.

Here are the steps:

  1. Close all apps running on your Mac.
  2. Open Terminal.
  3. Run the command below to display information about your Fusion Drive.diskutil cs list
  4. Look for the Logical Volume Group UUID and the Logical Volume UUID.
  5. Delete the Logical Volume Group with its UUID. (e.g., diskutil cs delete E03B3F30-6A1B-4DCD-9E14-5E927BC3F5DC)diskutil cs delete LVG_UUID
  6. Delete the Logical Volume with its UUID.diskutil cs deleteVolume LV_UUID
  7. Wait for Terminal to complete its job.

After your Fusion Drive is split, follow Apple's guide to recreate a Fusion Drive again.




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