I need to make fresh installation on my iMac 2012 of macOS Sierra. I already upgraded to that one, but I want to make a fresh install. I found several articles, but I am not sure if they right, because I think they have an additional drive to make an installation on (they talk about non-bootable USB).
As far I do the following:
- USB flash drive formatted to HFS+ Journaled + GUID
- Install on it Sierra files using:
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction
- Reboot + using
Command + Rkey to show menu.
I need to delete my HDD from Disk Manager, but I am not sure that my USB is boot-able and I can start installation from USB drive. Also I am not sure that I will not delete some important part from my HDD!
Can someone advise me how to do that?
Remark: I have only this Apple computer at my disposal.