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I have a clone of my internal SSD on an HFS+ partition of an external drive. I was wondering if there are issues with using such a disk as a startup disk with High Sierra.

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  • macOS High Sierra supports both HFS+ and APFS as the file system of a Startup Disk, so why would you think there's going to be any problem? – user3439894 Oct 21 '17 at 17:02
  • "I have a clone of my internal SSD on an HFS+ partition of an external drive" (which either means dd if=/dev/disk0 of=/dev/disk2s2 or dd if=/dev/disk0 of=/Volumes/External/disk.image) doesn't make much sense here. – klanomath Oct 21 '17 at 19:11
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    @klanomath it means Carbon Copy Cloner, source=internal SSD, Target=some partition on external volume. – A.G. Oct 21 '17 at 19:55
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    @user3439894 Appart from just "not knowing", part of my concern is that MacOS might have set preferences/config files on my SSD that tell the OS to expect an APFS disk and that cloning that onto an HFS+ and then using it a a startup disk might create problems. – A.G. Oct 22 '17 at 0:09
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Yes - High Sierra fully supports running / booting from HFS+ since it doesn’t even change any system over to APFS except for Apple SSD based systems. Fusion drives and spinning HDD hard drives all remain on HFS+ as do all external drives connected to your High Sierra system.

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