How to Partition A Hard Drive on macOS (macOS High Sierra or Earlier)

Posted by Abby Poole to DVD to Hard Drive, Mac Tips | Last uplodated on Dec 3, 2018

You have a massive pile of DVDs and want to copy DVDs to Mac for backup and much easier management, you may need to partition a hard drive on your Macbook or iMac. If you plan to run another separate operating system, Windows or macOS High Sierra, you should create a partition on your Mac. There may be time when you want to partition a hard drive on Mac without losing data for different purposes. If you don't know how to do so, follow the steps below.

Reasons to Partition Your Mac

We can benefit a lot from partitioning your Mac's hard drive. Look at our list of advantages of creating different volumes on Mac.

Disadvantages of partitioning a hard drive on Mac

Dividing Mac hard drive into different partitions is not always a good thing. You'd better check out these disadvantages you are facing before you decide to create a new partition on your Mac's hard drive.

How to Partition A Hard Drive on MacBook Air/Pro/iMac with Disk Utility

Now, I bet you've made a well-informed decision. Follow these steps to learn how to add an additional partition using Mac built-in tool Disk Utility. If you can't partition your hard drive on macOS, scroll down to find some possible fixes.

Step 1: Open Finder and click Applications, open the Utilities folder and double click Disk Utility.
Step 2: Select the hard drive on the left pane. Internal storage drives are under the Internal section, external drives under the External section.
Step 3: Click Partition button on the top of the window.
Step 4: Click Add icon to start to partition a hard drive on Mac without losing data. Click separate volumes, enter the name and size or drag the controls to set the size you prefer, and select a format for the partitions. If you start up hard drive partition to copy DVDs to hard drive or store other data, check out the output DVD file size or data size and then determine the volume size you want.

Tips: what format to choose for separate volumes
Mac OS Extended (Journaled): HFS+ is used for Mac, and the Encrypted requires a password to encrypt the partition. Mac OS Extended (Case-sensitive, Journaled) is case sensitive to file folder and names, FAT is used for Windows volumes that are less than 32 GB, ExFAT is used for Windows that are above 32GB.

Step 5: When the partitions info is set, click "Apply" button.
Step 6: Click "Done" when the partitioning hard drive on Mac is finished. Learn how to format Mac hard drive before using.

how to partition a mac hard drive

Why Can't I Partition My Hard Drive Mac (Errors & Fixes)

Disk Utility partition greyed out Mac
Can't partition (option greyed out) External HDD on macOS Sierra. Hi guys,Scoured the net for an existing solution to this problem, but to no avail. I'm attempting to partition a 500gb external HDD for Mac to run bootcamp, but whenever I go into Disk Utility, the option to partition the drive is greyed out.
Solutions: Try to format the external hard drive on Mac again and use the GUID Partition Table. If you don't see the option first time, disconnect and connect your hard drive to computer again. The hard drive should be formatted for HFS+ correctly.

Cannot partition external hard drive Mac
Trying to partition Mac hard drive and install Windows with Boot Camp Assistant on my Mac, but get error message saying "your disk could not be partitioned, an error occurred while partitioning the disk. Any ideas about how to solve this error?"

Try the following steps to solve "cannot partition a hard drive on Mac" error:
1. Restart your Mac and hold down Command +s to enter Single User Mode.
2. Enter /sbin/fsck-fy into the command prompt interface.
3. Press Enter, and then type in reboot.
4. Press Enter and you computer will restart. Now, try Boot Camp Assistant again.

Fast Copy DVD to Mac Hard Drive Partitions

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