Installing new Mojave OS on a new internal SSD

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Level 1

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Installing new Mojave OS on a new internal SSD

I have removed my original internal drive (named imacOrignalHD) and I am currently using it as a USB bootable drive to install Mojave on my new internal SSD (named iMac SSD HD). I am currently booted up via USB on the imacOrignalHD.

I wanted to use terminal command line to install Mojave on the internal SSD called iMac SSD HD.

sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume/imacOriginalHD

The instructions in this help area say that it will ask me to erase "my Volume" which is the original HD. I don't want to do that - -I only want to erase the internal SSD. Help me understand before I make a mistake.

Posted on Jan 21, 2021 7:22 AM

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Answer 1

Jan 21, 2021 10:06 AM in response to ralphedo

It sounds like you are trying to "How to create a bootable installer for macOS" :

https://support.apple.com/en-us/HT201372

For Mojave the command to copy the Mojave installer to a USB flash drive in that document is:

sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

I.e. you are booted normally and have "Install macOS Mojave.app" installer in your /Applications folder and a USB flash drive (or a "real" drive) named "MyVolume" mounted on the Desktop. The command erases and then copies that Mojave Installer to the flash drive that you can Option-boot and then (if necessary first format as APFS, GUID) install Mojave to the desired disk.

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Answer 2

Limnos

Level 10

419,893 points

Jan 21, 2021 7:24 AM in response to ralphedo

Why aren't you just installing it from the Applications folder on your boot drive the normal way? I just did that with exactly your configuration.

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Answer 3

ralphedo Author

Level 1

5 points

Feb 3, 2021 6:42 AM in response to Limnos

Thanks. I tried that initially but it would not let me do it - All of my Drives were not available. But after trying it again it worked. I am not sure what I did differently, but thanks.

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Installing new Mojave OS on a new internal SSD

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