Step 2: Select the hard drive on the left pane. Step 1: Open Finder and click Applications, open the Utilities folder and double click Disk Utility. If you can't partition your hard drive on macOS, scroll down to find some possible fixes. Follow these steps to learn how to add an additional partition using Mac built-in tool Disk Utility. Now, I bet you've made a well-informed decision. How to Partition A Hard Drive on MacBook Air/Pro/iMac with Disk Utility Partitioning doesn't make much sense if the hard drive has small capacity.It will take longer time to copy data from one partition to another.
However, this is not a big problem as storage is cheaper today. It's common that you do have free space on the hard drive, but there's no enough space left on these partitions.
Some space gets lost if you have more than one partition.
