System: 2015 MBP, macOS 10.12.3, Filevault 2 disabled I am trying to decide if I should revert core storage. I do not understand why Apple has core storage enabled on all newer Macs. Is there any reason not to revert the core storage? If I revert core storage, what happens if I want to enable Filevault later? Here is information I have found during internet research: Core Storage is a logical volume management system on macOS originally important for creating fusion drives (available since 10.7). Core Storage should not be disabled if: File Vault 2 is enabled. Using a Fusion drive. How to disable (revert) core storage. Did I miss anything?: Run these 2 commands in terminal. diskutil cs list diskutil coreStorage revert lvUUID where lvUUID is the last lvUUID reported by the previous Terminal command.