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1. #FORMAT FLASHDRIVE FOR DMG MAC OS#
2. #FORMAT FLASHDRIVE FOR DMG INSTALL#
3. #FORMAT FLASHDRIVE FOR DMG UPDATE#
4. #FORMAT FLASHDRIVE FOR DMG FULL#

If you would like to create an install drive for a macOS version other than Catalina, just tweak the paths above to refer to Mojave or High Sierra instead. Give it some time, and your volume will soon be loaded up with not just the macOS installer but also an external recovery partition that may come in handy if your hard drive dies and you're away from an Internet connection. The command will erase the disk and copy the install files over. Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled

#FORMAT FLASHDRIVE FOR DMG MAC OS#

Assuming that you have the macOS Catalina installer in your Applications folder and you have a Mac OS Extended (Journaled)-formatted USB drive (which is to say, HFS+ and notAPFS) named "Untitled" mounted on the system, you can create a Catalina install drive using the following command. The Install Disk Creator is just a wrapper for the terminal command to create macOS install disks, so if you’re comfortable formatting your USB drive yourself and opening a Terminal window, it’s almost as easy to do it this way. This should only take a few minutes on a USB 3.0 flash drive in a modern Mac, though using USB 2.0 will slow things down. A progress bar across the bottom of the app will tell you how far you have to go, and a pop-up notification will let you know when the process is done. Once you're ready to go, click "Create Installer" and wait. You can navigate to a different installer if you want, and you can also pick from all the storage devices and volumes currently connected to your Mac through the drop-down menu at the top of the window.

Install Disk Creator will automatically detect macOS installers on your drive and suggest one for you, displaying its icon along with its path.

Apple rolls support for newer hardware into new macOS point releases as they come out, so this will help keep your install drive as universal and versatile as possible. If you want to use this USB installer with newer Macs as they are released, you'll want to periodically re-download new Catalina installers and make new install drives. There are other apps out there that do this, but this one is quick and simple.

#FORMAT FLASHDRIVE FOR DMG UPDATE#

The macOS 10.15 Catalina installer from the Mac App Store (in High Sierra or older macOS versions) or the Software Update preference pane in Mojave.A USB 3.0 drive will make things significantly faster, but an older USB 2.0 drive will work in a pinch 8GB drives worked for Mojave and older versions of macOS, but the Catalina installer is just a little too large to fit. A 16GB or larger USB flash drive or a 16GB or larger partition on some other kind of external drive.We've created a USB stick from both Mojave and Catalina, but your experience with other versions may vary. A Mac that you have administrator access to.Luckily, it's not hard to make one-either with a handy graphical user interface or some light Terminal use.

#FORMAT FLASHDRIVE FOR DMG FULL#

Further Reading macOS 10.15 Catalina: The Ars Technica reviewĪpple hasn’t shipped operating systems on physical media in a full decade, but there are still good reasons to want a reliable old USB stick for macOS Catalina.