The Apple script doesn’t provide for this (it kinda does, but you might as well follow these steps). This option is useful in case we do not want a USb stick or drive – for example for a Virtual Machine, we’d rather have a DMG, as it’s much faster when installing macOS on your Virtual Machine. Option 2 – Manually – Creating macOS Install Media as a DMGĪs with option 1, we of course first will need to download the right file from the Apple App Store. Sudo /Applications /Install\ OS\ X\ El\ Capitan.app /Contents /Resources /createinstallmedia -volume /Volumes /MyUSBDrive -applicationpath /Applications /Install\ OS\ X\ El\ Capitan.app Note: Here I describe how to create macOS install media, either as a bootable USB stick to do a fully clean macOS install for your Mac, or a DMG file, for example to setup a virtual machine. a DMG or ISO file) so you can install another version of macOS. This comes with challenges though, since Apple, in their infinite wisdom, does not simply provide macOS install media (eg. Some of my favorite tools simply no longer work, and as a developer this makes me nervous when considering switching to the latest and greatest.įor this purpose I always create a virtual machine in VMWare Fusion, running the macOS version that I ran before the update. For some it’s nothing, for other it’s a disaster.Ĭatalina is one of the latter, a disaster for quite few amongst us, due to changed security rules and the lack of support of 32 bit applications. Click OK.In this article, I’ll show you the steps to create macOS install Media …Īs most Mac users will know each new macOS version comes with a few challenges. Once the formatting completes, an Info window will appear congratulating you for a successful install.The app will open another Warning window confirming if you want to reformat the drive.
A Warning window will pop up, asking you if you want to continue.Once you're ready to format your USB drive, click on Install.This action digitally signs your boot drive so modern, more secure systems will read your boot drive as valid. You can also look for the lock icon on the left of the Ventoy In Package version number to ensure that secure boot support is activated. Click on the Option menu and ensure that Secure Boot Support is checked.Important: Ensure the drive you chose is empty because Ventoy will erase its contents and format it. In the Ventoy2Disk window, under the Device dropdown menu, select the correct removable drive where you want to install your multiboot USB.
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