Fusion Drives

[TODO]

Erasing

Catalina

Boot into testing drive.

Use Disk Utility to break Fusion, then secure erase each drive separately.

Use DeployStudio to create a new Fusion Drive and deploy.

Repairing

Full explanation here: https://support.apple.com/en-gb/HT207584

High Sierra and earlier

Boot into the newest Internet Recovery with Option + Command(⌘) + R (or: Command(⌘) + R) and open terminal.

diskutil cs create Macintosh\ HD disk0 disk1

diskutil cs list

Use the Logical Volume Group GUID in the following command

diskutil cs createVolume logicalvolumegroup jhfs+ Macintosh\ HD 100%

Mojave and later

Boot into the newest Internet Recovery with Option + Command(⌘) + R (or: Command(⌘) + R) and open terminal.

diskutil resetFusion