How To Partition Mac Harddrive For Os High Sierra
Time required: < 10 minutes
Formatting a drive so you can install and boot macOS requires the GUID partition map. Unfortunately, Disk Utility in macOS High Sierra doesn’t make that option easy to find. Read on to see where. Oct 07, 2019 Mac mini introduced in mid 2010 or later iMac introduced in late 2009 or later Mac Pro introduced in mid 2010 or later. To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu. If your Mac isn't compatible with macOS High Sierra, the installer will let you know. High Sierra's recovery partition is inside the container: 3: APFS Volume Recovery 506.6 MB disk1s3 The command diskutil apfs resizeContainer disk0s2 1g jhfs+ Media 0b tries to resize disk0s2 containing all subsequent APFS Volumes to 1 GB and reclaim all freed-up space (150.4 GB - 1 GB = 149.4 GB) for another HFS+ partition Media ). Go to the Mac App Store and redownload the 'Install MacOS High Sierra' application. It should be about 5.2GB large. Run the installer, and use it to install High Sierra on the internal drive. Remember, everything's running off the external drive with the OEM SSD. You now have High Sierra on both drives. Use the Migration Assistant to restore. Launch Disk Utility. Select the disk, not the volume, in the left-hand lists of disks. Click the Partitions button. You can now delete other partitions (select and click the - button), and type in. Click on “Create or remove a Windows partition” option and hit “Continue” button. Then select a hard drive on your Mac for disk partition. Next, confirm the size of the partition for running Windows OS. At last, hit the Partition button and that is done. Now you're ready, without need for worrying about data loss, continue reading to know how to resize partition on Mac by using the Disk Utility. Resize Partition on Mac with Disk Utility. Mac Disk Utility is a powerful built-in application in Mac OS that has undergone a series of changes with every major OS update.
To partition USB drive macOS High Sierra can be a useful way to organize your data on an external hard drive. Problem is, most USB keys and external hard drives come formatted for Microsoft Windows and have what’s called a Master Boot Record. By default, you can’t view the options to enable you to change this in macOS’s Disk Utility to be able to change it to the standard GUID partition: this is what allows you to create partitions on a USB drive or external hard drive.
Typically the Partition button will be greyed out, and on hover the following message will be displayed: “Disks with master boot record cannot be partitioned.”

Fear not, however, for we have found the solution:
In Disk Utility, Select View and tick Show All Devices. This unhides the containers where you can select to Erase (format) a drive with a GUID Partition table. Follow along for the full guide on how to partition a USB drive in macOS High Sierra.
Partition USB Drive macOS High Sierra
Things you will need:
- A Macintosh computer running macOS High Sierra (10.13) or higher.
- A USB key (any size GB is fine) OR
- an external hard drive (USB or otherwise, any size GB will work).
WARNING: This process will have you format the USB drive or external hard drive, which means you’ll lose all existing information on that drive. Triple-check that there’s no data on the drive that you want to save, if there is, you will have to move it somewhere else before you continue. You’ve been warned.
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Part 1: Prepare USB Drive
If your drive is already formatted as GUID Partition Map and you can see containers in the sidebar, you can skip to Part 2: Partition USB Drive.
- Plug in your USB key or external drive to your computer.
- Launch Disk Utility. Press
CMD + Spacebarto search for it or go to Applications > Utilities > Disk Utility in Finder. - In the upper left corner of Disk Utility, select View (A) and tick the option Show All Volumes. Your sidebar should now show a parent field for your USB drive or external hard drive. Select this parent (see screenshot).
- With your USB drive or external hard drive selected (B), click Erase in the toolbar (C).
- In the window that pops up, for Scheme select GUID Partition Map (D).
- Name: You may give your drive a new name (this is how it will be shown in your computer later on.
- Format: if you need the drive to work on both Macs and PCs, select ExFAT. Otherwise Mac OS Extended (Journaled) is your best option.
- Click Erase (E) to begin reformatting. Depending on your drives size this may take a few minutes.
- Click Done when complete. Now your drive is ready to be partitioned, see Part 2 below.
Part 2: Partition USB drive macOS High Sierra
If your USB drive is formatted as GUID Partition Map, the Partition button should now no longer be greyed out.
- Select your drive in the sidebar (A) and click Partition (B).
- In the window that opens, use the
+and-buttons in the lower left corner (C) to add and remove partitions. Give each partition you want to add a name (D) and set its size in GB (Gigabytes) (E). You can also drag the dots around the circle representing your drive to change the size of each partition. - When you’re happy, click Apply (F) and then Partition in the popup window. Your partitions will be created, this may take a few minutes.
- Click Done when complete.
- That’s it! Your new partitions will be mounted on your desktop and appear as separate drives in macOS High Sierra.
Were you able to partition USB drive macOS High Sierra?