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Chapter 4. Setting System Preferences > Selecting a Startup Disk

Selecting a Startup Disk

Instead of starting from your local hard disk, you can start your computer from a CD, a network volume, another disk or disk partition (a single hard disk separated into two distinct areas), or another operating system, such as Mac OS 9. Starting your computer with Mac OS 9 is useful when you want to use older applications that are not compatible with Mac OS X. When you start your computer in Mac OS 9, you need to use the Startup Disk Control Panel in the Apple menu to switch back to your Mac OS X startup disk. If Mac OS 9 is not available in the Startup Disk preference pane, your computer only starts in Mac OS X, which happens on some newer computers. However, you can still run most Mac OS 9 applications in the Classic environment, which you can start using the Classic preference pane in System Preferences.

Select a Startup Disk

Click the System Preferences icon in the Dock, and then click the Startup Disk icon.

Click the icon of the system folder you want to use as the startup disk.

Click Restart.

TIMESAVER Hold down the Option key while you restart your computer, select a startup disk, and then click Restart.


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