#Usb drive mac os how to
#Usb drive mac os update

While holding the вЂњoptionвЂќ key down, turn on the Mac to display the Startup Manager.

Unfortunately, the вЂњStartup DiskвЂќ did not list my USB flash drive as a startup option, so I was not able to use this method. Then on restart, the Mac should boot from the USB flash drive.

#Usb drive mac os how to

Note: AppleвЂ™s How to create a bootable installer for macOS page suggest using the вЂњStartup DiskвЂќ configuration (under вЂњSystem PreferencesвЂќ) to select the USB flash drive as the startup drive. The above process took 20-30 minutes using my Kingston USB 2.0 flash drive. Install media now available at '/Volumes/Install macOS Catalina' To create a bootable USB macOS Catalina installer, run the вЂњTerminalвЂќ application and this command:Д®rasing disk: 0 %. (USB 2.0 and large capacity drives may take longer.) After the format completes, the partition will be mounted under вЂњ/Volumes/CatalinaвЂќ (or whatever name you selected above). The format operation may take several minutes to complete.Click the вЂњEraseвЂќ button in the warning popup dialog if you get one. Click the вЂњEraseвЂќ button at the bottom.If available, select вЂњMaster Boot RecordвЂќ for вЂњSchemeвЂќ.Select вЂњMac OS Extended (Journaled)вЂќ for вЂњFormatвЂќ.Input a name like вЂњCatalinaвЂќ (this name will be overwritten later).Click on the вЂњEraseвЂќ tab (or button at the top).On the left-hand pane, select the USB drive (not the partition under it, if any).Plug the USB flash drive into your Mac.If the USB flash drive is not already formatted as вЂњMac OS Extended (Journaled)вЂќ, format it like so: You donвЂ™t need to delete the existing content on the drive because we will blow it all away in a subsequent step. For example, you can move the вЂњInstall macOS CatalinaвЂќ application to the вЂњ~/DownloadsвЂќ directory and run it from there.Д«ecause macOS Catalina is 8.4GB in size, you will need a 16GB USB flash drive.

#Usb drive mac os update

Note: If you plan to run the installer first to update your current macOS version to Catalina, you will want to move the вЂњInstall macOS CatalinaвЂќ application out of the вЂњ/ApplicationsвЂќ directory otherwise, the installer will delete itself from the вЂњ/ApplicationsвЂќ directory when the upgrade completes. If the installer automatically launches, just close it. It will be saved to the вЂњ/Applications/Install macOS CatalinaвЂќ location. Go to the Mac App Store, search for вЂњmacOS CatalinaвЂќ, and download it. (The Mac mini came with macOS 10.14 Mojave so I used it to download Catalina.) You will need a Mac to download macOS Catalina you can download Catalina from The Mac Go. Note: The instructions below are the same for macOS 10.13 High Sierra and macOS 10.14 Mojave. I purchased a used 2018 Mac mini desktop and wanted to put a fresh installation of the latest macOS 10.15 Catalina on it.