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Sep 2, 2016 7:32 AM in response to mopedmollyby lllaass,With the external disk connected, I would boot to Recovery
About OS X Recovery - Apple Support
Using Disk Utility in Recovery Erase the external disk.
Then partition the disk with Mac OS Extended (Journaled)
http://pondini.org/OSX/DU1.html
Then instal OSX on the external disk via Recovery.
During initial setup you can Migrate information from the internal disk