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How Do I Select A Startup Disk Before Booting?

Question:

I have two operating systems installed on my Mac. Is there an easy way to choose which startup disk to use when I'm booting up the computer?
- Asked by Linda E. March 4th, 2011

Answer:

To select a startup disk while booting in Mac OS X just hold the option key during startup. You will be presented with a list of bootable options.

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