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Step 2: Now we need to create a bootable USB drive. We have a guide for that, so make sure you follow it and move on to the next step: Create macOS Catalina Bootable USB Flash Drive Installer, Here’s How. Step 3: When you have your USB drive, turn your Mac off and insert it. Turn the Mac back on while holding the Option key. I have a Catalina.dmg on my PC and want to know how can I make a bootable install usb on Windows 10 PC? More Less Posted on Jun 8, 2020 7:08 PM. Similar to Mojave, if you can get it to install and boot, sure, there is no reason you can't -run- Catalina from an external USB-C drive. Given the hiccups involved w/Mojave, however, I'd not bother. If you need to include an external, try parking your Home folder on it, instead, and use FUS to get in.
How to make a bootable ISO of macOS Catalina
NEW INSTRUCTIONS: JUST FOLLOW APPLE!!
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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.
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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:
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sudo dd if=Catalina.iso of=/dev/rdisk### bs=4m
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Good luck!