What does macOS need?
To understand where these sections come from, you need to understand what macOS is looking for in a disk drive for it to install "properly". macOS put some restrictions on the size and the possibility to even format a partition as HFS+ if some requirements are not fulfilled.
macOS looks for:
    a GPT formatted disk
    a EFI partition:
      FAT32 formatted (not that it matters for it)
      flagged as EFI System Partition (hex: EF00 in gdisk)
      is 200MB at least
      in the same disk where macOS should be installed.
    60GB of free space
If any of these are in your target disk, you're good to go, if not, that's the point of this guide.
Last modified 2yr ago
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