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This procedure will not work for your 2015 Mac. Step 6.2.5 states: "Run: clean". The next step (6.2.6) states: "Run: create partition primary". This indicates the external drive is using the Master Boot Record (MBR) partition scheme. The 2015 and later Macs can no longer boot operating systems using this scheme. The question you refer to involved a 2014 Mac. ...


With few exceptions, a Mac must run the OS X version that it shipped with as a minimum version. The minimum OS for your Mid-2014 MacBook Pro is at least 10.9.4, so you won't be able to run Snow Leopard on it.

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