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Option-reboot doesn't show external drive

I have an external drive for regular backups (SuperDuper) and it's working fine as far as that goes - new files are there when I check, it shows up in Disk Utility, it's there as an option for Startup Disk in System Preferences etc. However, when I try booting from it on startup (pressing the Option key), it doesn't show up at all.

(I haven't actually tried setting it as the startup disk and seeing what happens because I'm nervous as to what the Mac would do if it couldn't find it then.)

Any suggestions? Thanks

iMac Line (2012 and Later)

Posted on Feb 10, 2019 3:27 PM

Best reply

John Galt

Level 10

141,308 points

Posted on Feb 13, 2019 4:55 PM

Contact its developer for support: Contact a third-party vendor - Apple Support.

Your Mac already includes Time Machine. To learn how to use it please read Back up your files with Time Machine on Mac.

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Option-reboot doesn't show external drive

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