Hoping someone can help out with a suggestion as I expected this to go much smoother like my MacBook Pro upgrade went lol. I am using a 500GB Samsung T5 by the way.
I am assuming that as soon as I plug this SSD in some background process starts up and starts using it for some reason but have no idea what it is. When I went to eject the SSD after resetting the boot drive to the MacBook internal SSD(I rebooted after doing this) I got message saying the drive could not be ejected because some applications may be using it. I connected my SSD to my MacBook Air set it as the boot tried to run the installer and still got the same error. I tried something to try and further isolate the issue. Unmounted the internal drive HDD before running the installer. Uninstalled the installer and downloaded fresh. Unable to unmount volume for repair”įirst time upgrading with the external SSD so I assume this is user error but not sure how to go about fixing this issue. “MacOS could not be installed on your computer.
You can also unmount an external drive by dragging the icon into Trash. Choose the drive on the left of the Finder window and then right-click and choose Eject. To eject any external drive, you can use Finder. Had no issues installing Sierra but now when I try to install High Sierra it gives the following error: Open Disk Utility, choose the needed drive, and click on Unmount to unmount a disk. I have a 21.5 iMac late 2013 that boots from an external SSD.
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