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Choose the Default Startup Volume in Mac OS

if you have a Mac, and it has multiple hard disks or partitions containing operating systems, including Windows installations in BootCamp partitions, you can set any of them as the default 'Startup Disk'

Step Number: 
1
Action: 

Open the System Preferences app from the Apple Menu, or from the Dock.

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Step Number: 
2
Action: 

In System Preferences, double-click the 'Startup Disk' preference pane.

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Step Number: 
3
Action: 

In the Startup Disk preference pane, click the lock in the lower left to enable changes, and then click the volume that you want to make the 'default' start-up volume. In the example, the Windows Bootcamp volume is selected.

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Step Number: 
4
Action: 

Click the 'Restart' button to start up from the selected volume, and thereby the selected operating system. Remember, this setting changes the default operating system, so if the machine is restarted, and no action is taken to select another startup volume, it will choose the one selected here. To change this setting from Windows on a BootCamp-equipped Mac, see .

For additional help, please contact the LTS Help Desk at 610-758-4357 or helpdesk@lehigh.edu