External Booting on 2014 Mac Mini

mactectom

macrumors newbie
Original poster
Nov 17, 2017
3
0
For a while now, when attempting to boot from an external drive, my 2014 Mac mini keeps booting from the internal drive. Iv discovered that if I unplug the other USB drives from the Mac (time machine and media drive), it will boot from the external ssd. But, I have to do that every time I start up my machine. I think this started with the Mojave update, but not sure. Any fix for this?
 

Fishrrman

macrumors P6
Feb 20, 2009
17,425
5,646
Don't want to insult you, but have you tried:

Booting with the option key held down continuously until the startup manager appears?
and then...
...Going to the startup disk preference pane and designating the external drive to be the boot drive?

By the way...
Are all the external drives "bus powered"? (i.e., not using their own power supplies).
With several drives connected, perhaps the USB bus power isn't enough to get that boot SSD "up and running" before the Mini "looks elsewhere" and "finds" the internal drive...
 
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keysofanxiety

macrumors G3
Nov 23, 2011
9,519
24,628
As Fishr said, hold Alt on startup to select all disks. Navigate to the boot drive you want to be default by using your arrow keys and then hold CTRL. The icon will change (making it the default boot drive) and then press Enter to boot into it.

Any better from there?
 

Boyd01

Moderator
Staff member
Feb 21, 2012
4,204
1,876
New Jersey Pine Barrens