Clone doesn't show up as startup disk

[OSN]

I've booted from my external drive before, but now it doesn't show up as a startup disk after apparently making a successful bootable copy.

Is there anything I could try?

[dnanian]

Sure. It's likely mispartitioned - see the Frequently Asked Questions section of the SuperDuper forum, top question.

[OSN]

Thanks for the quick reply. The drive showed up and booted successfully when I restarted and hit option.

I assume that means it must be partitioned correctly?

[dnanian]

Definitely not. It means it's not partitioned right (but still works for EFI, but not System Preferences). It should be repartitioned properly as explained in the FAQ.

[OSN]

OK thanks.

[OSN]

Got everything working properly by following those instructions, thanks again.

[dnanian]

Glad to hear things worked as expected.