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Bootable installer

Before I install Catalina I want to make a bootable installer on a USB drive. I have a 32 GB drive with High Sierra and Mojave installers. The drive is about equally split between the two installers, although each one is about 6 or 7 GB in size. So there is plenty of room for the third installer. The terminal command to make the installer will erase the drive. Can I use Disk Utility to partition the drive into thirds, without erasing either of the bootable installers? And then will the terminal command point to the empty partition?


sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled -- /Applications/Install\ macOS\ Catalina.app


Or should Untitled be named something else?

Posted on Oct 17, 2019 4:42 PM

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Posted on Oct 17, 2019 5:58 PM

This is not my preferred area of expertise, but I can pretty much assure you that it will not work the way it shows because the Catalina installer is more then 8 GB. and you can only resize/add/change the last partition at the end (i think) which means you cannot connect the two empty partitions without having to erase the whole thing. Better get some confirmation on that.

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Question marked as Top-ranking reply

Oct 17, 2019 5:58 PM in response to DesertRatR

This is not my preferred area of expertise, but I can pretty much assure you that it will not work the way it shows because the Catalina installer is more then 8 GB. and you can only resize/add/change the last partition at the end (i think) which means you cannot connect the two empty partitions without having to erase the whole thing. Better get some confirmation on that.

Bootable installer

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