DiskMaker X 9 for macOS Catalina
DiskMaker X 9 for macOS Catalina is a macOS utility that creates a bootable installer drive for macOS Catalina from Apple's installer app.
What is DiskMaker X 9 for macOS Catalina?
DiskMaker X 9 for macOS Catalina is a macOS utility for building a bootable external installer for macOS Catalina. It helps users turn Apple's macOS Catalina installer app into a USB installer disk that can be used to reinstall macOS, prepare multiple Macs, or keep a reusable recovery installer on hand. The app is designed for straightforward guided use rather than manual Terminal work, making installer creation easier for people who want a simple desktop workflow. DiskMaker X is published by Guillaume Gète and targets Catalina installer media specifically in this version. It requires an external drive that will be erased during creation, and the Catalina release notes note a 16 GB minimum thumb drive size. This app is most useful for Mac users, technicians, and support workflows that need offline or repeatable macOS installation media.
Key features
- Create a bootable macOS Catalina installer drive from Apple's installer app
- Find the macOS installer on your Mac and guide you through disk creation
- Prepare external USB media for reinstalling macOS on compatible Macs
- Help set up repeatable installer media for multiple Mac deployments
- Provide a simpler graphical workflow than building installer media manually in Terminal
- Use notarized Catalina-era builds intended to run on macOS 10.10 or later
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Safety overview
Status: Mostly safe
DiskMaker X 9 is a legitimate disk-creation utility whose behavior matches its purpose, but it performs a destructive task by fully erasing the selected external drive while building installer media. Use it only with a drive you intend to wipe, confirm the target disk carefully before proceeding, and download it from the official DiskMaker X site. The Catalina version was notarized for macOS Catalina, which is consistent with normal distribution for this kind of Mac utility.
Recommendation: Keep DiskMaker X 9 if you create macOS Catalina installer media or maintain older Mac deployment and recovery tools. If you no longer build bootable Catalina installers, you can remove it without affecting macOS itself; just make sure you no longer need any installer USB drives or related workflow notes before deleting the app.
Common paths
/Applications/DiskMaker X 9.app
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