Hi folks!
Last week I accidentally upgraded my macOS to Catalina and it forced me to use Macintosh HD disk to run it. I ran previous OS on my SSD and all my files are on there. Now that all my files are in the SSD including the OS software. I tried to connect the SSD to my PC to see if I can take all the files out, but no hope. Would love to know how do I run my macOS on the SSD again? Please help!!! Thank you!!
Macs can Install on and boot from any appropriate disk, internal or external. If you did a software upgrade, it upgrades ONLY the disk you told it to install on. All others are left untouched.
If you installed on a different disk, it's pretty simple to go back to the Old MacOS and the old disk.
System Preferences > startup disk ...
select the disk you want to boot from
Click restart.
it will come up on whatever disk you decided to choose, running whatever MacOS you last installed on that specific disk.
If the SSD does not show upon Disk Utility when View By DEVICE is selected, showing its immutable device-name and a reasonable non-zero size/capacity, it cannot be used, repaired or initialized. if it is powered correctly and its data connection is sound, it has died.
.
So turned off my mac and turned on again, but this time I held the option key and 2 disks showed up for me. I chose the SSD and got it running normal again. Everything still in there. Thanks for your help!
Hey thanks for the reply. Unfortunately, the SSD disk doesn't show up on my mac!! You have any other ideas?
Glad you got that one sorted out.
What is the date of your most recent backup? if your Mac had not come back to life...
accidentally upgraded to macOS Catalina
