Macworld - USA (2019-12-B)

DECEMBER 2019 MACWORLD 23

get a failure message
saying that the drive
couldn’t be unmounted,
try reformatting the
drive first as ExFAT
using Disk Utility.
Then start the process
over again.
When the app is
done, the installer is
ready to use.

MAKE A BOOTABLE INSTALLER
DRIVE: THE LONGER WAY
USING THE TERMINAL
You don’t need to use Install Disk Creator
to create a bootable installer. You can do it
in the Terminal and it’s easy. Here are the
instructions.

1. Connect the external drive to your
   Mac. In these instructions, I use Untitled as
   the name of the external drive. If your drive
   is named something else, you need to
   change Untitled to the
   name of your drive.


2. Launch Terminal (/
   Applications/Utilities/
   Terminal.app).


3. Select and copy
   the following:
   sudo /
   Applications/
   Install\ macOS\
   Catalina.app/

Contents/Resources/

createinstallmedia --volume /

Volumes/Untitled -- /

Applications/Install\ macOS\

Catalina.app

4. Go back to Terminal and paste the
   copied code at the prompt. Press Return.


5. Terminal will warn you that your
   external drive needs to be erased. To
   proceed, type Y at the prompt and press
   Return.

Paste the code you copied into the Terminal then press Return.

You’ll be asked about erasing the disk.

The Terminal. Don’t worry if your screen doesn’t look like this. I

changed it in the Terminal settings, and you can too. In Terminal,

select Terminal → Preferences →t Profiles, click on the one you like,

and then click on the Default button.

4.

2.