If the macOS installer says this volume is not a supported Core Storage configuration

You may get this message after replacing the hard drive component of your Fusion Drive with an SSD.

This article has been archived and is no longer updated by Apple.

Fusion Drive combines a hard drive and flash storage in a single volume for improved performance and storage capacity. If the hard drive component of your Fusion Drive was removed and replaced with an SSD (solid-state drive), your Mac is no longer using a supported Core Storage configuration.

To return to a supported configuration for Fusion Drive, replace the SSD with a conventional hard disk drive, then follow the steps to fix a split Fusion Drive. You can then install macOS on the Fusion Drive.

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