Step 3: Click Partition button on the top of the window. Internal storage drives are under the Internal section, external drives under the External section. 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. Boot Camp's role is to automate that selection so you don't have to worry about partition tables. If you have both Mac and Windows, though, you need some way to select between those partitions. Your Mac looks for its operating system on that partition. When it boots, how does the Mac know which partition to target? The partition table has an indicator of which partition to use when booting. Boot Camp could also help in partitioning a separate hard drive if you had multiple hard drives in your Mac. Boot Camp will resize your existing macOS partition and create and format a new partition for Windows. Boot Camp, though, takes care of this partitioning for you. You could use any disk utility to create and format new partitions. However, if you want to install multiple different operating systems on the same hard drive, you have to create different partitions for them. This is sufficient for most users, and it makes it easy to track your total available hard drive space. When your Mac is fresh out of the box, it recognizes all the available storage space on your hard drive as one single partition. From there, the partition table indicates which partition has the operating system and other data needed to finish booting the Mac. Those first bytes point to the partition table. When you boot your Mac, part of the boot process includes accessing the first few bytes of data of the hard drive.

Why partition disk mac