Thus, if you are running virtual machines, transferring large files or testing a web app using Docker or Kubernetes, it’s best to create another “work” installation of macOS alongside your default “personal” installation of macOS. This work installation of macOS should not be encrypted to ensure that the T2 chip can give you fast storage performance.
Each time you boot your Mac, hold down the Option key on your keyboard to get a menu that allows you to choose which macOS installation you want to boot (work or personal).
Another reason to install macOS a second time is that your personal and work installations can have different Apple IDs attached to them. This allows you to easily separate your personal Apple ID from one used solely for developing software or as part of an Apple Developer Program for your organization.
To install macOS a second time, you must first create a new APFS logical volume:
Open Disk Utility (/Applications/Utilities/Disk Utility.app).
Click the drop-down menu beside the View button in the toolbar and choose Show All Devices.
Click the + button to create a new APFS volume.
Specify a name for your APFS volume (e.g., work) and optionally set a Reserve (minimum) or Quota (maximum) size if you want to guarantee or limit the space the new logical volume can consume from the underlying partition, respectively.
Next, you can open the App Store, search for macOS Catalina and choose to download it (approximately 8GB). When the download has finished, the installation will start automatically.
At the beginning of the installation, you’ll be prompted to select the volume on which to install macOS. Simply choose the new volume you created (e.g., work) and proceed through the rest of the installation normally.
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