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Dec 17, 2015 3:54 AM in response to Dwyerfenby Nubz N.,★HelpfulHowdy Dwyerfen,
I'm glad the Mac is so easy to boot to multiple versions of the OS on different volumes. Installing the OS on an external hard drive is similar to installing it on the internal drive.
How to install OS X on an external drive connected to your Mac - Apple Support
Note you want to insure it is properly formatted first, then follow the appropriate section of the article which applies to how you are installing the OS.
Take care.
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