Install older OS X onto an external drive. The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Start your Mac holding down Command + R. Prepare a clean external drive (at least 10 GB of storage). Within OS X Utilities, choose Reinstall OS X. Select external drive as a source. That one game mac os. Enter your Apple ID. I just got the new MBA M1, to replace my 2011 MBP (which is Mac OS Journaled). My current external drive I use for my Time Machine backup is the same, with a partition also for FAT 32 (in case I had to put files onto Windows). I have a new 2 TB external drive. What's the best way to partition.
Having a running OS off of an external drive is not usually recommended, so I strongly advice against it.
You can solve the absence of having an OS on your Mac by following the following steps.
Ensure your MacBook Pro is connected to a reliable wifi source that can hold up for about an hour.
Power off your MacBook Pro and then power it on.
As soon as the MacBook Pro is on and the background sound is heard, hold down the Command (⌘) – Option (⌥) – R combination of keys.
This will get you into internet recovery mode, which should be a grey logo of a globe.
After the internet recovery mode is all loaded up, click on the reinstall macOS High Sierra.
Clicking this should take you to a screen where you chose the disk you would like to install macOS High Sierra on. click on Macintosh HD at this point.
After completing the basic formalities of agreeing to the terms and conditions, installation of macOS High Sierra will begin.
The installation of macOS High Sierra is highly dependant on your internet speed. With 150 Mbps of internet speed mine took about half an hour.
When I reinstalled macOS, I got an error saying 'Couldn't create preboot volume for APFS' if you encounter a similar error you can reply to this post.
Having a running OS off of an external drive is not usually recommended, so I strongly advice against it.
You can solve the absence of having an OS on your Mac by following the following steps.
Ensure your MacBook Pro is connected to a reliable wifi source that can hold up for about an hour.
Power off your MacBook Pro and then power it on.
As soon as the MacBook Pro is on and the background sound is heard, hold down the Command (⌘) – Option (⌥) – R combination of keys.
This will get you into internet recovery mode, which should be a grey logo of a globe.
After the internet recovery mode is all loaded up, click on the reinstall macOS High Sierra.
Clicking this should take you to a screen where you chose the disk you would like to install macOS High Sierra on. click on Macintosh HD at this point.
After completing the basic formalities of agreeing to the terms and conditions, installation of macOS High Sierra will begin.
The installation of macOS High Sierra is highly dependant on your internet speed. With 150 Mbps of internet speed mine took about half an hour.
When I reinstalled macOS, I got an error saying 'Couldn't create preboot volume for APFS' if you encounter a similar error you can reply to this post.