Install macOS a Second Time

You can easily (and safely) install macOS multiple times on the same system because Apple now uses the APFS filesystem, which supports multiple logical volumes on the same underlying partition.

Modern Macs come with a small ARM processor (called the T2 chip) that acts as the SSD storage controller, sound controller, touch bar controller, Trusted Platform Module (TPM) and more.

When you get a new Mac, the filesystem on the SSD is encrypted by default, and this encryption is performed entirely by the T2 chip. While this is generally a good thing for personal files, it causes havoc if you perform many small writes to the filesystem because the multipurpose T2 chip just can’t handle the load like other dedicated storage controllers can.

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).


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