These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Both Windows and Mac OS offer built-in disk formatting tool. For Windows, it offers quick format feature when you right-click the hard drive on the computer. If you are using a Mac, you can run the built-in Disk Utility to quickly format a hard drive or external hard drive under Mac OS. NO.1 USB drive formatting software for Mac – DoYourData Super Eraser. DoYourData Super Eraser.
The macOS installer file is large with approximate size of 6 to 10GB depending upon the. Three ways to format USB flash drive, external hard drive on macOS Catalina. There are many tools can help you format USB flash drive, portable hard drive, memory card or other storage device on macOS Catalina. Here, we will show you three ways to format USB.
Find the appropriate download link in the upgrade instructions for each macOS version:
macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.
MyVolume
in these commands with the name of your volume.Y
to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created. * If your Mac is using macOS Sierra or earlier, include the --applicationpath
argument, similar to the way this argument is used in the command for El Capitan.
After creating the bootable installer, follow these steps to use it:
For more information about the createinstallmedia
command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:
Catalina:
Mojave:
High Sierra:
El Capitan: