Your Mac has a native application called Disk Utility to create a or partition. A disk image is a file that emulates a drive or volume whose image it contains. Also, the disk image file stores other files & folders just like a virtual drive and can be mounted as a volume within Finder. Generally, the native disk image format of macOS has the .dmg file extension.
If your Mac still refuses to boot off your USB stick you may find it easier to boot and install off an Ubuntu DVD instead. See our How to burn a DVD on macOS for further details. Alternatively, if you feel confident using the macOS command line, see the community documentation on How to install Ubuntu on MacBook using USB Stick for a more. I’ve come up with three ways you can create a bootable OS X install drive for the Yosemite: using the installer’s built-in createinstallmedia tool; using Disk Utility; or performing the Disk.
In this blog, we’ll share the Disk Utility method to create a disk image file of your Mac startup disk. We’ll also share how to restore your startup disk by using the already created image file.
The need for Creating Disk Image of Mac Startup Disk
You can create a disk image of your Mac startup disk:
·To burn the startup disk’s data to CDs or DVDs
·To back up your startup disk’s apps and settings
·To restore your Mac from the recovery image file
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·To compress the startup disk’s data for archival purpose
·To protect startup disk’s files and folders through encryption
·To transfer startup disk’s files and folders between Macs
·To store the startup disk’s data in NAS or a different volume
Prerequisite
To create a disk image of your Mac startup drive, you need any one of the following save locations with sufficient space:
·Additional volume on your Mac
·Mounted external storage drive
·Connected network storage drive
Methods to Create Disk Image of Startup Disk
First Method
First off, quit or stop any apps and services to minimize writing on to the startup drive during the image creation process. Subsequently, perform the following steps to create a disk image of your Mac startup disk:
1.Go to Applications > Utilities > Disk Utility.
2.On the Menu bar, select File > New Image > Image from Folder.
3.On the dialog window, select your startup disk (Macintosh HD) then click Open.
4.Provide a name for the disk image, add tags if needed, and specify a save location.
5.If you wish to encrypt the disk image, then click the Encryption pop-up menu and choose an encryption option.
6.Click the Image Format pop-up menu, then specify an image format. You can choose from Read-only, Compressed, Read/write, DVD/CD master, Hybrid image (HFS+/ISO/UDF)
7.Click Save then Done.
Second Method
Boot your Mac from a different startup drive, say macOS Recovery to create a disk image of your Mac startup disk. Steps are as follows:
1.Start or restart your Mac then immediately press and hold Command + R keys together.
2.Release the keys once you see the Apple logo. Mac starts in macOS Recovery mode.
3.From the macOS Utilities window, select Disk Utility then click Continue.
4.After Disk Utility opens, perform the steps listed in the first method.
Third Method
You can create and manage your disk image file through terminal commands. Steps to create a disk image file of your Mac startup disk by using Terminal are as described below:
2.Type hdiutil create –volname N –srcfolder P –ov N.dmgthen press Return.
Note: Here replace N with the name of the disk image file and P with the path of the source volume.
3.Quit Terminal.
Steps to Restore a Startup Disk Image
You can restore your startup disk image file to your startup disk. But, first off, save any important files and folders present on your startup disk to another volume or storage drive to avoid data loss that will ensue due to disk erasure.
Steps to restore startup disk image file to startup disk are as follows:
1.Open Disk Utility on your Mac from macOS Recovery mode.
2.From the sidebar, select the startup disk (Macintosh HD) then click the Restore button. Note: Your startup disk will be erased and will become the replica of the image file.
3.Click the Image button then navigate to the startup disk image file.
4.Click Open then click Restore.
Conclusion
We hope this blog helped you to understand the nitty-gritty of how you can create a disk image of your Mac startup disk on your macOS Mojave. The best and safest method is to use Disk Utility—a GUI app that simplifies the image file creation process. Advanced users may try the Terminal method to create a startup disk image and manage it from there. The blog also shared the technique on how to restore a startup disk image to a startup disk by using Disk Utility.
It is a must that you back up your Mac before performing any critical troubleshooting process; for instance, when you restore from the image file to the startup drive. The wrong choice of the source and the destination drive could result in data loss. In such a dire situation, a Mac data recovery software can be your savior. The software can salvage your precious data that got lost due to accidental erasure or other logical data loss scenarios.
If you've always wanted to partition your Mac's hard drive so you can run a separate operating system — including the launch of macOS Big Sur — in tandem with your current one, it's surprisingly easy to do so thanks to Apple's built-in disk utility program. Here's how to partition your Mac.
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What is a disk partition?
Partitioning your Mac is basically splitting your hard drive into separate, usable systems. It makes it possible to run two separate operating systems on one device, like Windows and macOS, or two versions of macOS (like Catalina and Big Sur).
Note: If you want to run Windows on your Mac, Apple's Boot Camp assistant will automatically make a partition for you. Here's how to install Windows.
It is important to note that partitioning your hard drive also splits up your available hard drive space. Each partition will take up a portion of your usable storage. So, if you are running low on storage capacity on your hard drive, we don't recommend partitioning.
Before you start
The most important thing to do before making any changes to your hard drive is to back it up. Seriously. Back it up. Please. Time Machine is the easiest way to back up your data if you don't already have another system in place.
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Second, make sure you have enough free disk space to properly run a secondary operating system. Shoot for at least 30GB free, though I recommend closer to 50GB if you have it available.
How to create a partition on your Mac
Open Finder from your dock.
Select Applications.
Scroll down and open the Utilities folder.
Double-click to open Disk Utility.
Select your hard drive in the Disk Utility window. It will be the first drive on the list. It might be named 'Fusion,' or 'Macintosh HD.'
Click on the Partition tab. You will be prompted to either add an APFS volume or a Partition.
Click Partition.
Click the Add partition button it looks like a plus (+) symbol.
Change the size of the partition you wish to use by dragging the resize controls. The used space is represented in blue.
Name the new partition.
Specify which file system format you want to use. If you're running macOS 10.13 or higher, you'll want APFS. If you are running macOS 10.12 or older, you'll want Mac OS Extended.
Click apply.
Disk Utility will check the disk and make changes. This will take several minutes.
How to switch partitions
You can switch to the new partition, install the current macOS, and then download and install macOS Catalina from there.
Click the Apple icon in the upper-left corner of your screen.
Select System Preferences from the drop-down menu.
Select Startup Disk.
Click the Lock in the lower left corner of the window to unlock and make changes.
Enter your system admin password.
Click OK.
Select your partition drive.
Click Restart.
You can also restart your Mac and press the Option Key when you hear the startup chime. This will take you to the Startup Manager and you can select your drive from there.
You will then be asked to install macOS. This will install the latest available macOS onto the partitioned hard drive. You may have to install an older version of macOS before updating it to the more recent version you want to run.
If you are testing a beta version of macOS, you'll first install whatever the current version is. Then, you can then install the macOS beta.
How to download the developer beta of macOS Big Sur
Once you've updated your partitioned Mac with macOS Catalina, you can download and install the developer beta of macOS Big Sur. You need a developer account and probably some patience. Developer betas are often a bit complicated to install. We've got a guide to help you out.
Any questions?
Do you have any questions about installing a partition or downloading a new operating system onto a partitioned drive? Let us know in the comments. If you're having trouble partitioning your hard drive, be sure to check out our forums for help!
Updated June 2020: Updated for the developer beta of macOS Big Sur.
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