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1. #Create a bootable external hard drive for mac high sierra how to
2. #Create a bootable external hard drive for mac high sierra full version
3. #Create a bootable external hard drive for mac high sierra install
4. #Create a bootable external hard drive for mac high sierra full

Select your startup volume in the left sidebar.Go to Applications>Utilities and double-click Disk Utility to launch it.It uses containers, each of which can host multiple volumes. This makes it easy, because APFS doesn’t require you to create a new partition. If you’re running Mojave, your startup disk will be formatted as APFS.

#Create a bootable external hard drive for mac high sierra full

If it’s still in developer beta, you’ll need to wait until the full public beta is available in July, unless you’re a registered Apple developer.īefore you download macOS Catalina, you’ll need to create a volume on which it can be installed.

#Create a bootable external hard drive for mac high sierra install

Download and install macOS Catalinaĭepending on when you read this, macOS Catalina will either be in developer beta, public beta, or full release. Then, when you install Catalina, below, choose it, rather than the second volume, as the location for the install. In this case, instead of using Disk Utility to create another volume on your startup disk as shown below, you should grab a USB stick or external hard drive with at least 16GB capacity and use Disk Utility to erase it and reformat it. If your start-up disk is not formatted as APFS, your best option is to install Catalina on external drive.

You can check the format of your startup drive by clicking Launchpad > Disk Utility. The exception is hard disks or Fusion drives running High Sierra. If your Mac is running High Sierra or Mojave, its startup disk is probably formatted as APFS. A Mac that’s capable of running Catalina.

#Create a bootable external hard drive for mac high sierra full version

In October, the full version will be available on the Mac App Store. Then there will be a public beta available. It’s only available to Apple developers until July. You can download it here, so I recommend giving it a try, you might find that it frees up tens of gigabytes of space. You can either let it scan your whole Mac, or focus on specifics like iTunes, Photos cache files, Launch agents, or large and old files you no longer need to access regularly.

And it makes it easy to remove junk files, too. It makes it really easy to identify what’s taking up all your disk space, thanks to its System Junk tool. It’s not often that I recommend specific applications, but for this purpose, I’m a big fan of CleanMyMac X. We’re going to install Catalina on your main startup disk (yes, you don’t need an external disk!), so the more space you have available, the better. The other thing you should do is clear out the junk on your Mac. It will slow your Mac down, but will force Catalina to ask for permission before it access encrypted files and folders. You should also consider turning on FileVault. Just make sure you have a backup of your entire Mac before you download macOS Catalina. You can use Time Machine or any other backup tool. Once installed, macOS Catalina will have access to all your files and folders, so back up your Mac just in case it damages them.

#Create a bootable external hard drive for mac high sierra how to

Here’s how to dual boot macOS Mojave and macOS Catalina. One way you can do that is to create a dual boot system so you can still boot into Mojave, or whatever macOS you’re currently running, when you need to. However, as it’s beta software, it comes with a health warning and you should take precautions when testing it. If you’re excited at the launch of macOS Catalina and want to try out all the new features for yourself, you can download the public beta from July and give it a go. But to help you do it all by yourself, we’ve gathered our best ideas and solutions below.įeatures described in this article refer to the MacPaw site version of CleanMyMac X. So here's a tip for you: Download CleanMyMac to quickly solve some of the issues mentioned in this article.