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I can switch between OSX, Windows and a network drive, but I cannot seem to find this option anywhere.

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rEFIt is a boot menu and maintenance toolkit for EFI-based machines like the Intel Macs. You can use it to boot multiple operating systems easily, including triple-boot setups with Boot Camp. It also provides an easy way to enter and explore the EFI pre-boot environment.

  • rEFIt allows you to sync partition tables
  • customize:

    • set default to boot from
    • define wait time before a boot option is selected
    • configure the rEFIt boot screen

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You can use rEFIt, which will automatically present you with all boot options when you install it to the OS X Volume (see this article for more detail).

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There's a System Preference pane called Startup Disk (Apple > System Preferences > Startup Disk) that allows you to choose which disk to start up from.

Does that help any?

Startup Disk Preference Pane

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This will not work in a multi-boot setup with linux operating systems. – gentmatt Jan 23 '12 at 18:35
This lets me select an OS, but not the option screen to choose what OS I want when the computer is switched on. – danixd Jan 23 '12 at 19:24

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