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Chapter 23.  Emergency Startup Measures  > Changing the Startup Disk

Changing the Startup Disk

If you have Mac OS X Version 10.2 and Mac OS 9.2 (or an earlier version) installed on separate disks or disk partitions, you can choose the disk or partition from which you want the system to boot. Of course, booting from an OS 9.x disk starts your Mac with the OS 9.x operating system and booting from the Mac OS X Version 10.2 disk starts your system with the Mac OS X Version 10.2 operating system. This section covers how to reboot from disk to disk and system to system.

NOTE

As of this writing, Apple had announced that it intended to discontinue the ability to boot into older operating systems on Macs shipping with Mac OS X Version 10.2 Jaguar during 2003. So whether or not you will be able to boot to a startup disk with an older operating system will depend on the age of your Mac and how you installed Mac OS X Version 10.2.


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