Can we use startosinstall option on a USB as a bootable. createinstallmedia helped us create an bootable installer.

New Contributor II

Is there a way where we can use the startosinstall on a USB and boot from it. I was looking for a result would be similar to NetRestore.


New Contributor III

Although i think its not "best practice", it is possible:

#create the USB Installer
-Download the OS X High Sierra installer via the App Store, it will be installed into the /Applications directory
-If it opens automatically, close it
-Insert a USB stick (8GB+)
-Run the following command where MyVolume is the name of the USB volume:
sudo /Applications/Install macOS High --volume /Volumes/MyVolume

# boot the USB installer
-Boot the computer holding the Option key
-Select the USB installer as the startup disk
-Open Utilities > Disk Utility and make sure that the internal SSD/HDD is properly formatted (e.g. in HFS+ or APFS), named (Macintosh HD) and erased -Close the Disk Utility and -Open Utilities > Terminal and type the following: "/Volumes/Image Volume/Install macOS High" --volume “/Volumes/Macintosh HD” --converttoapfs NO --agreetolicense

-By use of that command the machine will restart and install macOS High Sierra without APFS conversion. (for APFS conversion you can simply use "--converttoapfs YES" or don't use that command

This method was tested on 10.13.5 and 10.13.6.