For a HDD which will have both HFS+ and APFS volumes, is it better to format the disk itself in Disk Utility (on High Sierra) as APFS or HFS+?

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    This is not how disks work. You will first need to partition the disk, and these partitions can be of different types. As the person in your other question already described. You cannot format a partition that is HFS+ with as APFS, that would make the partition an APFS portion instead. (a volume is basically a formatted partition that is mounted) – Gert-Jan Roeleveld Jan 7 at 18:23
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    This is using Disk Utility, which I should have stated and have just clarified by editing my question. When erasing a disk in Disk Utility, before partitioning, one must choose the format. – paxromana Jan 7 at 18:32

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