Mac OSX Boot from External Drive


Booting from an External Device on Restart

  • Connect the external drive or device to the Mac
  • Reboot the Mac and after the startup chime hold down the OPTION key during boot until you see the boot selection menu
  • Click the external volume to boot from it

Selecting a Different Boot Drive

  • Attach the boot drive to the Mac
  • Open System Preferences from the  Apple menu and choose “Startup Disk”
  • Select the newly connected boot volume from the list, then choose “Restart” or reboot the Mac as normal to start from that disk

 

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