The whole APFS fire drill has been such a cluster*k. According to experts <https://blog.macsales.com/43043-using-apfs-on-hdds-and-why-you-might-not-want-to?APC=XLR8YourMac13>, you're only supposed to use APFS on internal SSD drives, and nothing else.
That having been said, I have no idea why your external won't boot. I have an HFS+/GUID partitioned rotating external (one historical OS version per partition) and High Sierra boots from it just fine. I sympathize with your plight, but I can't say I'm surprised by it. I avoided upgrading to Sierra until High Sierra came out, and I may repeat that pattern with High Sierra. > On Feb 28, 2018, at 9:12 AM, Michael Brian Bentley <[email protected]> > wrote: > > I've had a heck of a time getting the Ts crossed and the eyes poked (ow!) > installing High Sierra on an internal OWD SSD and all the external backup > drives such that they all boot. i'm almost done. It's taken several days. > APFS has been a chore. > > I have a 4TB external hard drive that has High Sierra installed, is an > HFS+/GUID drive. It shows up in Preferences>Startup Disk as bootable. It does > not show up in the restart options menu, and the MBP doesn't boot from that > drive when selected via Startup Disk. > > Anyone know what's going on with this? Regrooving a 4TB drive is tedious. > > Mike > > _______________________________________________ > MacOSX-talk mailing list > [email protected] > http://www.omnigroup.com/mailman/listinfo/macosx-talk
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