And then you can turn on encryption with: diskutil list # Figure out the device name of the "Backup" volume. You can then convert to APFS using the item in the "Edit" menu of the Disk Utility. # - Use a GUID partition table.ĭiskutil eraseDisk JHFS+ Backup GPT disk2 Unfortunately, Disk Utility in macOS High Sierra doesn’t make that option easy to find. Instead, you must format it from the command-line: # - Format as Journaled HFS+. Formatting a drive so you can install and boot macOS requires the GUID partition map. However, the Disk Utility in macOS High Sierra provides no way to change the partition map scheme, even when you erase the disk. Turns out that was wrong and it is a legacy scheme the GUID partition map is the one you want. I had an external drive that I had formatted with the Apple Partition Map, mistakenly thinking it was the "best" format because the name suggested it was the one tailored to macOS. Disk Utility supports the following schemes: GUID Partition Map:Choose this option for all Intel-based and Apple Silicon Mac computers. Click the Erase button when you are done and the Disk Utility will format your disk with the. Partition schemes available in Disk Utility on Mac When you erase and format a storage device in Disk Utility on Mac, you’re asked to choose a scheme to use. These are notes made while trying to set up APFS-to-APFS backups with SuperDuper!. Then select the default GUID Partition Map (GPT) scheme.
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