To do this, head to the Startup Disk preference setting in Settings.Įvery time the Mac starts, you can also toggle between OS X and Windows by holding down the Option (Alt) key immediately upon startup. Step 6: Click the CD ROM drive icon, and select the Windows 10 disk. Once you have Windows installed, you can set the default OS that will start each time you boot your Mac. This will mount the Windows ISO so that you can use it to install Windows on the external SSD. Set the Default Startup OS or Toggle Between OS X and Windows The Mac will need to restart to complete the process and will automatically boot into Windows 10 when it's done. Run the set up and it will ask you for a location to unzip the files. Follow the prompts to finish installing Windows. To install Virtualbox in your removable drive, go to vbox and download the package (957 Kb).