


Next, click the + (plus) button underneath the pie graphic to create a new partition.On the next screen, click the Format box and switch it to APFS.At the top of the screen, click the Partition button.Select your external hard drive on the left margin.Double-click Disk Utility when it pops up. Open Finder and type Disk Utility into the search bar.You can use other formats, but it gets a little wonky. Connect the drive you want to partition.
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Also, if you do intend on using your external hard drive to boot Windows, Apple strongly recommends using Boot Camp to partition the drive instead of the Disk Utility feature.
