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Old Feb 18, 2012, 12:39 PM   #1
petrucci666
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Join Date: Apr 2009
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Installed Mountain Lion on ext. drive but doesn't show up on boot

I hold the Option key on boot but only Macintosh HD and Recovery HD show up, no external drives.

What am I doing wrong?
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Old Feb 18, 2012, 12:41 PM   #2
simsaladimbamba
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Does it show up in System Preferences > Startup Disk when booted from the OS on the internal HDD?
I guess, the external HDD is properly formatted?
How to format a new HDD/SSD to install Mac OS X or make a bootable copy onto
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