![]() I got to the point where I could select the drive, and it gave me the circle with a line (do not enter) symbol for about 30 seconds and then just shut off. So I tried to use it to reboot the old Mac. So I went back to finder and tried to eject. I left it like that for 45 minutes and it kept flashing. It erased the disk (thumb drive), copied the file to the drive, and gave some sort of message about completion sucess, but the thumb drive kept flashing like something was going on. I then ran the sudo command as directed, and everything SEEMED to work until the last step. (Side note, the download tried to install too, which scared the hell out of me, but the install seemed to abort before going far enough to do any damage, I downloaded the Catalina app to the applications folder on a second Mac running Big Sur. I am trying to do this for an old (circa 2012 ) Mac that is running OS X Catalina. THis seems like what I need, but it is not working quite right. Were you successful in making a MacOS Catalina bootable install drive? Did you use another method? Let us know in the comments whatever your experience has been. You can also access the regular bootable installer utilities, including Disk Utility for formatting and partitioning drives, and Time Machine recovery tools for restoring from backups. The MacOS Catalina boot disk will allow you to install MacOS Catalina as an upgrade, and also to perform clean installations of macOS Catalina if desired. Choose the macOS Catalina installer volume to boot from.Hold down the OPTION key upon system boot, and continue holding Option until you see the Mac boot menu.Connect the macOS Catalina install drive to the target Mac.To boot from the MacOS Catalina boot disk, connect it to a Mac, then reboot the computer and hold down the OPTION key to boot into the boot menu, where you will be able to choose the MacOS Catalina installer drive as a boot option. How to Boot with macOS Catalina USB Install Drive * If you see a “command not found” error message in the terminal, it’s likely because there was a typo or syntax error, or because the “Install macOS Catalina.app” application file was not found in the /Applications/ folder where it is expected to be. The MacOS Catalina boot disk can be used with any MacOS Catalina compatible Mac. At this point it can be used like any other boot disk or installation disk. Let the creation process build the boot installer disk and complete, it may take a little whileĪfter the MacOS Catalina 10.15 USB boot installer drive has been created, it will be mounted on the Mac.If the syntax is correct, hit the Enter/Return key and authenticate with the admin password as necessitated by sudo.Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/UNTITLED Enter the following command at the Terminal command line, assuming “UNTITLED” is the name of the USB flash drive you want to make into the Mac Catalina installer boot disk:.Open the “Terminal” application, it’s found in the Utilities folder and you can also launch it from hitting Command Spacebar typing Terminal and hitting return.Connect the USB flash drive to the Mac if you haven’t done so already, name the drive “UNTITLED”.Mistakes with syntax can lead to permanent data loss, or the erasure and formatting of the wrong disk, so proceed at your own risk. This process requires using the command line, if you are not comfortable using the Terminal than it is better to avoid this process. How to Make a Bootable macOS Catalina 10.15 Beta USB Installer Drive The Mac will also need to be online so that it can download the MacOS Catalina installer, if that hasn’t already be accomplished. Knowledge and understanding of the command line and Terminal.A complete “Install macOS Catalina.app” installer application residing in the /Applications/ folder on the Mac (you can download full macOS installers from Terminal with these instructions on newer MacOS releases, otherwise use the MacOS Catalina download link via App Store).USB flash drive (16GB or larger) – this will become the boot install driver for MacOS Catalina, it will be formatted so any data on this drive will be erased to become the boot installer.The following prerequisites are necessary to make a bootable installer drive for macOS Catalina: Requirements to Create a Bootable macOS Catalina USB Install Drive We’ll walk through how to create a boot USB install drive for MacOS Catalina 10.15. Bootable USB installers offer an easy way to upgrade multiple Macs to macOS Catalina, to perform clean installs of MacOS Catalina, to perform maintenance from a boot disk like formatting disks, modifying disk partitions, and performing restorations, and much more.
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