Good news, after half an hour on phone with Apple's support, it works. Not sure how to use it under the circumstances. If worse comes to worst, I have a Time Machine backup of the SSD prior to the Catalina upgrade. (The internal HDD was never partitioned throughout all previous OS X upgrades). This was probably created during the upgrade to Catalina. The external SSD is now displayed in Finder as two disks: Macintosh HD and Macintosh HD - data.
make iMac boot from the external Catalina SSD Is there any structured procedure (or another wild idea), to set it right? i.e. I made the above attempts following advices provided in various forums where success was reported on sporadic cases. This time the key combination commands seem to work, but even though I selected to boot from the SSD, which I reconnected, iMac simply booted from the internal HDD. I disconnected the SSD and tried again Recovery mode and NVRAM reset. The same happened when I tried NVRAM reset (opt+cmd+R+P) - the boot process form HDD continued regardless of that. This key combination worked fine when I cloned my HDD. I tried rebooting into Recovery mode (cmd+R+power) to get access to the disk utility - no effect! the boot process form HDD continued regardless of that. I used the Startup preferences to set the external 10.15 OS X SSD as boot disk - no effect! still booting from HDD. When completed the Mac booted to the old High Sierra OS from the internal HDD! I then performed another recommended security + Safari update. Today I performed a successful upgrade to Catalina.
Since then, program updates and content were added successfully to the SSD. Initially, the SSD was a clone of my internal High Sierra Macintosh HD. Nevertheless, its resolution is not clear and seems to be a matter of chance.įor clarity let me add the following background info:įor a couple of months I've been successfully running my 2013 iMac from an external SSD (for speed reasons). It seems a very similar problem has been reported.
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