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vansmith

 
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Member Since: Oct 19, 2008
Location: Toronto
Posts: 18,225
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Mac Specs: 2012 13" MBP (2.5 i5, 8GB)

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AFAIK, not all Macs (especially older ones) can boot from USB drives (I'll let someone chime in here who is more knowledgeable than I about this). Your model may be one that can only boot from FireWire devices. What model of MacBook are you using (Apple logo > About this Mac > More Info... > Hardware Overview > Model Identifier)?

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