Mac – Enabling external booting on a fusion drive Mac

fusion-drivemacrecovery

I am trying to change the secure boot settings so that I can allow booting from an external disk. Normally to do this you would go into recovery mode with command + r and then change the settings. When I try to do this, however, my mac decides to boot up using recovery mode with internet, in which I cannot change the secure boot settings from. After doing a little research, this seems to be because my Mac has a fusion drive, which is causing the regular recovery mode to not start up. My question is: how do I get into regular recovery mode on a fusion drive Mac? If I can’t, how do I change the secure boot settings without going into recovery mode?

Best Answer

Option 1)

Wait for Internet recovery to finish loading, proceed with normal steps.

P.S. this shouldn't be necessary unless you've enabled the option to disallow booting from external media. If that is the case, see this article for instructions: https://support.apple.com/en-us/HT208198#open

Option 2)

If you're impatient like me, go to System Preferences > Startup Disk.

Click on the drive you wish to boot from, click Restart.

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