Does a Mac running 10.13.3 have to be partitioned

WD External Drives External Drives for Mac
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Does a Mac running 10.13.3 have to be partitioned?

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What HDD or SSD configuration your Mac 10.13.3 have? Is it APFS or HFS formatted? Partitioning a hard drive isn’t mandatory until you choose to install Windows via Bootcamp or you prefer to segregate OS data from personal data.