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 Catalina — 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.
What is a disk partition?
Nov 11, 2012 Though we rarely reboot our Macs around here, rebooting a Mac will almost always free up a fair amount of disk space, simply because it flushes system caches, some app caches, installs system updates, and perhaps more significantly, the virtual memory swap files and sleep image files. The latter two can grow quite large if you rarely reboot a Mac. Often time comes, when one starts finding Mac partition too small or big that he/she either want to add some more space or trim the extra unused space for increasing the storage efficiency. Identically, sometimes it becomes essential for the Mac users to deleted unused partition data and create new partitions in the Mac drive. Jun 13, 2009 Restore the.dmg to the bottom partition and boot from it. Installed snow leopard to the top Partition and to clean up i erased the install partition and expand the snow leopard startup disk to fill the unused space. It all fit onto a 20GB Xbox 360 Hard drive with 9GB of space to spare. Mar 28, 2017 Here are the steps to resize the boot camp partition of your Mac drive: (1) First select the Mac drive, the software ask you to create a bootable DVD. (2) The software will create an image of OS X startup disk.
Insert the flash drive into the USB port of a Mac computer that has the DMG file you need. Launch Finder. After a couple of seconds the drive appears in the left menu of the Finder menu. If Mac OS X doesn't recognize the flash drive, it prompts you to format it and the Disk Utility app opens. Nov 11, 2019 First, make sure you have a current backup of all the data on both Stuff and More Stuff. Launch Disk Utility. From the right-hand sidebar, select the drive that contains both the Stuff and More Stuff volumes. Click the Partition button. Select the More Stuff volume from the pie chart.
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 Mojave and Catalina).
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.
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
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.
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 macOS Mojave before upgrading to macOS Catalina.
How To Partition More Space Onto Dmg File Mac FreeHow to download macOS Catalina
If macOS Mojave doesn't automatically install on your partitioned hard drive (if it installs macOS High Sierra instead, for example), you can install it from your System Preferences in About this Mac. Older versions of openvpn client dmg.
After you have macOS Mojave installed, you can follow the instructions to download and install macOS Catalina.
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 September 2019: Updated for macOS Catalina.
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