Reformat Macbook Air
my external flash drive is detected on my macbook air, and i can read the files, copy and paste, but it is not seen startup boot tab...
since i want to format my macbook, there is no way i can boot from the external flash drive.
any script that i should jot in the terminal. knowing that my flash drive is detected on the desktop but not on the startup boot section or tab.
please advise.
MacBook Air, macOS Sierra (10.12.4)