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I prefer keeping Lion on a USB keychain so that I can add files to the USB drive to customize the installation but if you’re just looking for a bootable copy to troubleshoot your hardware, feel free to go with the DVD option and save yourself a little cash. (If you happen to own a Mac with a disc drive, consider creating a DVD backup of Lion. Create a macOS Catalina USB installer on Windows 10 via the UltraDMG app Method 2. Format your USB drive as Mac OS Extended (Journaled) and choose the GUID Partition Map scheme. The app will give you the option of creating a bootable drive out of either a DVD or a USB keychain. How to Create a bootable USB installer for macOS Catalina on Windows 10 PC Method 1. First, right-click the USB drive in Disk Utility and click Erase. Start the Lion DiscMaker app with your USB flash drive plugged in and with the Lion install file sitting inside your application folder. Lion DiscMaker makes this part of the process a snap. You have been warned! Creating Your Bootable Drive Now, before you start formatting your drive, back up anything currently on your flash drive that you’d like to keep–because this process will completely erase the contents of the USB drive and rewrite it with a copy of Lion. Downloading a third-party app just to handle this process is a bit of a bother, but Lion Discmaker enormously simplifies the process of installing Lion on a USB keychain. To streamline the process, download the free Lion DiscMaker app. If you already own a copy of OS X Lion, you should be able to download a fresh copy at any time from the Purchases tab of the Mac App Store.