How to create a macOS Catalina bootable USB installer. The storage device is automatically reformatted when you start to create a boot drive. Now that you are aware of the prerequisites, let’s go through the steps to create a macOS Catalina bootable USB installer: Launch the Finder and choose the Applications option on the left sidebar.
I have followed all tutorials available to make bootable Catalina USB. I used following command to create bootable USB. I have also shared a complete video tutorial on How To Create macOS Catalina Bootable USB on Windows: Step by Step, you can find the video at the end of this post. Step 1: Download the required files to Create macOS Catalina Bootable USB on Windows. MacOSCatalina10.1519A583 by techrechard (Google Drive + MediaFire).
Macos Catalina Create Boot Usb
How to make a bootable ISO of macOS Catalina
Mac Os Catalina Create Bootable Usb Windows 10
NEW INSTRUCTIONS: JUST FOLLOW APPLE!!
I’m not kidding, forget about the mess below. Apple has updated and documented this across several macOS versions. Find it at support.apple.com’s article “How to create a bootable installer for macOS“
Ignore everything below!!!
I previously wrote up my version of creating a macOS Mojave and Sierra HERE and HERE.
I’m updating it for macOS Catalina 10.15
First, navigate to the macOS Download page in the App Store and choose “GET”. Depending on whethere there’s a local copy or not, you may have to choose “Download” if you are offered it, and wait to download the whole installation app.
When you are done, the Installer will open. Quit the installer (via menu or via command-Q). This will leave the “Install macOS Catalina” installer in your /Applications folder.
Then copy this code and save it as a shell script named “CatalinaUSB.sh”
After creating the shell script, you can make it executable (“chmod +x CatalinaUSB.sh”) or just run it like “sh CatalinaUSB.sh”. If you aren’t proficient in running scripts, you probably shouldn’t be messing with this in the first place!
You want to be sure to run this code in a directory that has enough space to hold a few copies of the ~10GB ISO simultaneously. Ideally it’s on fast media as well. And also not part of your cloud storage (iCloud Desktop, Dropbox, etc.). Often your home directory is just fine.
Bootable USB?
Want a bootable USB? Simply use dd to copy the ISO directly to your USB drive. I am not going to give you a real command to copy to do that… dd can be dangerous. But it’s as simple as something like this:
sudo dd if=Catalina.iso of=/dev/rdisk### bs=4m
Create Catalina Boot Usb Drive
Good luck!