Lastly it makes that drive bootable.ĭepending on the speed and age of both your Mac and your hard drives - both the spare and the one you're currently booted from - this could take anywhere up to 20 minutes.Īfter that, type exit into Terminal and when it says Process Completed then choose File, Quit. Then when that's done, it automatically copies the installer files - the Install macOS Mojave downloader from Apple - onto the drive. Apple did not make things easy with AppleScript and using external disks with the last release of macOS, and I’ve been unable to fix the bugs that prevent DiskMaker X to create a Catalina disk when already running Catalina (though it works quite well when running on Mojave). First it erases the drive and you'll see it report "10% 20%" as it goes. Disk Maker X6 says: 'erasing drive /Volumes/UNTITLED. Terminal and createinstallmedia will remind you that this means erasing the drive and if you enter Y then it will start the process. Try ejecting the destination disk and reinserting it, it probably couldnt be unmounted to erase it. Try ejecting the destination disk and reinserting it, it probably couldnt be unmounted to erase it. It's an Apple program: they've created it for us all, they just haven't mentioned it much. When you enter that, Terminal starts running a program called createinstallmedia. Hit return and you'll be asked for your Mac admin password. Sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/macinstall With Apple's installer safely copied somewhere and the drive you want to make into a bootable installer ready and mounted, now you open Terminal. Copy it to another folder or drive just so that you know you never have to schlep through this downloading again - at least until next year. It'll be in your Applications folder with the name Install macOS Mojave. Click on the Install macOS Mojave menu and choose Quit Install macOS. When Apple's macOS Mojave installation app is downloaded, launch it but don't let it start the installation process. That drive can be called anything you like but so that you can just copy and paste our Terminal instructions, rename it macinstall. Mount the drive or the volume that you want to do this on. If that's an SSD one then you'll be glad: the speed of the installation depends hugely on how fast your drive is. It will end up erased and with only the Mojave installer on it so really pick one you can spare. While that download is happening, pick a drive - USB or Thunderbolt-connected - that you can use as a Mojave install disk. Most of us will get it from the Mac App Store but if you have a developer account, you can elect to get the latest beta from instead. Get Apple's macOS Mojave installer and start downloading it. Then, too, this is ultimately about installing a major macOS update onto all your Macs so that thought you had a moment ago about backups is spot on. A stray typo isn't likely to cause you problems, it's more likely to just not work, but it can. The program is compatible with many macOS, including macOS Catalina Install App, and requires macOS 10.10 or later to run. This is one of the easiest uses of the Terminal program on Macs - but it still needs you to take care - and in this case to specifically copy and paste the instructions into it. DiskMaker X, formally known as Lion DiskMaker, is free software developed using AppleScript that helps you to create bootable USBs. Then type some commands in Terminal to extract Mojave, and put the installer on an external drive so you can re-use it without having to download it every time. Rather than working through Apple's installer, you download that once and stop it before it begins working. Select Restart from the drop-down menu.Given that we have lives as well as multiple Macs, we need to do something about this.Click on the Apple icon in the upper left corner of the screen.Connect your Mac to the internet via Wi-Fi or Ethernet.Remember, back up your Mac before performing this step. You'll need to erase your hard drive before re-installing Catalina. 2.) Open Finder and go to your Applications folder. Drag the Mountain Lion on a rock to the Applications folder that the arrow is pointing to. If you don't feel comfortable making changes to your Mac with Terminal, you can create a bootable disk using the DiskMaker X program. Open the DiskMaker X disk image (.dmg) file and you will get a window with the application and a shortcut to the Applications folder. Note: Making a bootable installer requires the use of Terminal. How to make a bootable macOS Catalina installer drive in case you want to downgrade from macOS Big Sur.You'll need a copy of macOS Catalina on an external hard drive for the easiest, fastest way to install the downgrade.įollow the steps linked below to make a bootable installer drive for macOS Catalina Step 2: Create a bootable drive of macOS Catalinaīefore you downgrade your Mac and erase Big Sur from your computer, download macOS Catalina (opens in new tab) from the Mac App Store.
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