In the info window, expand the Sharing & Permissions: section.Mounting the USB flash drive on the desktop, right click and select 'Get Info'.The 'missing step', after ensuring the USB flash drive is formatted correctly, is to ignore ownership
For this reason, you will need to enable it before/after completing the process described by Apple, MacWorld and others using the 'createinstallmedia' command in the Terminal window. Complicating matters, the USB flash drive default may disable boot support. Most of the guides, including Apple's own support doc on how to create a bootable Mac OS installer on USB - as of this date - fail to mention the ownership step.įirst and foremost, the USB flash drive must support ownership functionality. It may be that boot-up from the USB flash drive is 'prohibited' because your USB flash drive requires adjustment to the 'ownership' settings.
