View Full Version : Installed Mountain Lion on ext. drive but doesn't show up on boot

Feb 18, 2012, 12:39 PM
I hold the Option key on boot but only Macintosh HD and Recovery HD show up, no external drives.

What am I doing wrong?

Feb 18, 2012, 12:41 PM
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 (http://forums.macrumors.com/showpost.php?p=12483448&postcount=22)