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Booting from the recovery partition on an exter...

I've cloned my boot volume (Carbon Copy) to an external USB disk and have verified I can boot from the clone.

Mainly as a point of curiosity - is it possible to also boot from the recovery partition on the external disk? In other words, press Option to select the external drive for boot and then once selected press Command-R to boot the recovery partition FROM THAT EXTERNAL DRIVE?

Does this change at all if the bootable external partition is APFS with High Sierra?

Reason I ask is I have a bootable High Sierra system on an external drive (APFS) and booting from it works fine. When I (again as a point of curiosity) try the Option key and then Command-R to try to boot recovery from the External drive - the system instead boots the full High Sierra. It leaves me to speculate that the Option and later Command-R sequence either does not work or that my external APFS drive lacks a recovery partition.

Thanks

We cannot talk about High Sierra until it is released next week.

When you boot with the option key, the bootable drives, and their corresponding Recovery partitions appear for selection. I would expect this to include your connected, bootable, external HFS+ drive and its recovery partition too. Have you tested this?

if your External Drive does have a Recovery Partition, then it should show

up when you hold the Option Key, during the initial start.

At least that is the way it works for me.

If you have made the clone with the option of having a Recovery HD, it

will be bootable and visible in the "boot manager". 

As far as High Sierra on an external drive, as stated until it is released,

can't say much about it, even if we knew.

最後更新：2017-09-23 23:34:10

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