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Install macOS Mojave by converting / formatting a partition from HFS + to APFS in a multiboot system

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Hi All,
I would like to replace macOS Sierra with macOS Mojave in a Sierra / High Sierra multiboot system in the same ssd (Asus P5G41T-M LX mb - Intel Core2Duo E8600 cpu - legacy-bios mode with Clover bootloader).
Unfortunately both existing partitions are HFS + and I read that installing MacOS Mojave requires an APFS partition.
Is it possible to format/convert, for example, the existing macOS Sierra partition from HFS+ to APFS without deleting the other existing macOS High Sierra partition?

Thanks in advance for Your help

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Mojave does not require APFS.  APFS is only installed by default if you have an SSD drive.  My experience is that if you format your disk to HFS+ before install, the Mojave installer will leave it as such during the install.

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