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Helpful answers
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Jul 7, 2015 4:30 PM in response to SAMMISTby Loner T,If the OSX Setup is a Mac application, just copy it to the USB and plug the USB and use the Alt Key to boot. If it is a .dmg file, use Disk Utility to restore it on the USB and test.
Please also see OS X: Installing OS X on an external volume - Apple Support.
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