As mentioned before, you can, one, set your computer to automatically use a startup disk using System Preferences, and two, temporarily override this choice at boot time using Startup Manager. It can also boot into Ubuntu or any other operating system supported by your Mac’s hardware. How to install Windows on your older Mac. How to install Windows on your newer Mac. Is your favorite MMORPG available only for Windows? Do you have all your financial data in a Windows-only accounting app? Need to test webpages in Windows? No problem-just install Windows on your Mac with Boot Camp. Select the startup disk that has the default operating system you want to use. If a User Account Control dialog appears, click Yes. However, choosing the default operating system will allow users to choose which operating system to boot upon start up without going through menus and restarts. Set the default operating system from Windows In Windows on your Mac, click in the right side of the taskbar, click the Boot Camp icon, then choose Boot Camp Control Panel.

Setting the default operating system in Windows using Boot Camp is significantly different from the directions in Mac OS X.

When you start up a Mac holding down the Option key, the boot volume menu appears on the screen - this shows all bootable volumes on the screen, making it simple to boot from any volume in your Mac.

Boot camp mac os default