This video supplements the one on downgrading from macOS High Sierra and explains how to easily remove APFS from your drive with one Terminal command. PLEASE NOTE: You cannot erase a hard drive or SSD that you booted from. Please read the comments and answers below the video. Also, if you have a solid-state-drive and High Sierra or Mojave, you are stuck with APFS as your drive with auto-convert every time you install macOS.

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