Dual Boot macOS Sierra & El Capitan from an External SSD

How To Dual Boot macOS Sierra and El Capitan from an External SSD.

Dual Booting macOS Sierra and El Capitan Using an External USB 3.0 SSD.

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Install and Run macOS Sierra From An External SSD:

https://youtu.be/hOQwjht4kcE

How To Create macOS Sierra 10.12 USB Boot Disk:

https://youtu.be/3WkUp1lK_sY

TRANSCRIPT:

We’ve already shown on the previous episode, how to install and run macOS Sierra on an external SSD.

We’re now going to create an additional partition on the external SSD, in order to dual boot macOS Sierra and El Capitan.

Soooooo, Let's Get Started.

As usual, since we'll be using Disk Utility, make sure you have or made a backup of your system hard drive or drives before proceeding.

Continuing on, after inserting the SSD in an available USB socket, open Disk Utility.

Now, click on the SSD header in the sidebar, then click the Partition button shown here.

To create an additional partition, click the plus sign button shown here and then name the  Partition to whatever you like and make sure that the default format is OS X Extended (Journaled), alternatively, to delete the partition simply click the minus button.

Once satisfied with your choice, click the Apply button to create the new partition.

Now, close Disk Utility and simply launch the macOS El Capitan installer and choose to install on the newly created partition, which, in my case,  is named macOS El Capitan SSD.

The remaining installation process, is exactly the same, as was shown in the previous episode.

In summary, after the installation process has finished, El Capitan boots to the Desktop, where, you can optionally set the default startup disk, to that of your Mac system drive after turning on your Mac

Once that’s taken care of, anytime you want to run macOS Sierra or El Capitan from the SSD, simply shutdown the Mac and proceed with the power and Option key combination, to boot to the Startup Manager and click the macOS, on the SSD, that you want to boot to.

And that’s all there is to it.

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