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For various reasons, I wanted to install Big Sur 11.7.3 on HFS+, but I could not do it. The install would always try to force-reformat my drive, so I eventually gave up and went with the APFS. Now I find out that an HFS+ volume can be installed as a separate volume on an APFS formatted drive. But could that HFS+ volume run Big Sur? Or are both these options a no-go? I haven't been able to find a specific answer to this. The target Mac is a 15" MacBook Pro Mid 2015 with a half-terrabyte SSD and 16GB ram. I know Carbon Copy Cloner won't do it, but is it even possible? At this point, my guess is "no", but I would sleep better, knowing. Thanks!

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No. BigSur filesystem is setup to require/rely on features of APFS. Interestingly enough though, bootable Bigsur system installers work formatted as HFS Extended Journaled.

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  • So even though an HFS+ volume can exist on an APFS formatted disk/SSD and contain and run a Big Sur installer, Big Sur OS cannot itself operate from HFS+. Got it, thanks!
    – user375909
    Feb 1, 2023 at 15:33

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