To set a size limit click on Size Options and fill in the Reserve (minimum) and Quota (maximum) options. You can set the storage limit if you want (but you don’t need to).You’ll need to give your volume a name, Beta would be a good idea if it’s the beta you are installing.We have a more detailed guide to this process, which we recommend you read if you have any problems here: How to partition a Mac hard drive or SSD, or create an APFS volume. Select the Home volume (or Untitled) and click on the + button to create a new volume.It’s likely you have one called Home or Macintosh HD. This will make sure you can see the volumes within your disk. Click the drop-down menu beside the View button in the toolbar and choose Show All Devices.Open Disk Utility (you can find it in the Utilities folder in Applications, or just press Command + Space and start typing Disk Utility).Back up your Mac (because it’s always wise to do that before you go on an adventure).If you are using an older version of macOS, or even Mac OS X, it’s a little more complicated. If you are running High Sierra on an SSD, or have any version since macOS Big Sur installed, this process is much easier because your Mac will be using the Apple File System APFS. Your method will depend on which version of macOS you are already running. So, you want to run two versions of the macOS operating system on your Mac. Make sure you can run the macOS versions you want: You won’t be able to run a version of macOS on a Mac that doesn’t support it, find out which version of macOS your Mac is compatible with.We show you how here: How to run macOS from an external hard drive. There are alternatives: If wiping your Mac sounds like too much hassle to you, you could try installing the alternate version of macOS on an external hard drive instead.Luckily you don’t have to wipe anything if you are just creating a volume.
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