1x 8GB USB (preferably USB 3.0).
1x Mac OSX Sierra Downloaded (But not installed).
Step 1: Go to ‘Utility’ via Applications (this may be hidden in the ‘Other’ folder.
Step 2: On the left side of the window select your USB under the ‘External’ tab.
Step 3: Select ‘Erase’ at the top of the window and ensure you rename the USB to ‘Untitled’ (this should be a default, but check anyways), select ‘OS X Extended (Journaled) for the ‘Format’ and finally select ‘GUID Partition Map’ (this map be called ‘GUID Partition Table’ depending on your version of OSX) for the Scheme. Once the above have been selected, hit ‘Erase’.
Step 4: Open ‘Terminal’ via Applications (this may be hidden in the ‘Other’ folder and paste the following exactly:
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction &&say Done
- Step 5: The following will take a few minutes depending on your computers specs and the USB used, Terminal should inform you when the process is done. Enjoy your bootable Sierra USB Drive!