Will you be using the disk with another Mac?.Are you preparing a Time Machine backup disk or bootable installer?Ĭhoose Mac OS Extended (Journaled) for any disk that you plan to use with Time Machine or for a bootable installer.During installation, the macOS installer decides whether to automatically convert to APFS-without erasing your files. If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). Are you about to install macOS High Sierra or later on the disk?.If the built-in disk came APFS-formatted, don't change it to Mac OS Extended. Are you formatting the disk that came built into your Mac?.If you want to change the format, answer these questions: If it can't, it chooses Mac OS Extended, which works with all versions of macOS. ExFAT: Windows compatible general storage.ĭisk Utility tries to detect the type of storage and show the appropriate format in the Format menu.Mac OS Extended (Journaled or HFS+): Mac format.APFS (Apple File System): Latest Mac format for macOS High Sierra or later (10.13+).

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