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The Mac may restart again during the installation process. The install will prepare to install, restart your Mac, and perform the installation. To continue, you must enter your username and password. But if you have multiple storage devices and/or multiple partitions, you can select the one you want by clicking the Show All Disks button.

If you have one storage device with one partition, you’ll see it in the installer window. The next screen will ask you to select the disk for the El Capitan installation. (If the installer isn’t running, go to your Applications folder and double click the Install OS X El Capitan app.) You’ll be asked to agree and then confirm that you agree to the license agreement.

OK, now you can click that Continue button in the installer window. If you don’t hold down Option, you’ll create an alias, not a copy. To copy the installer, you need to hold down the Option key as you drag the Install OS X El Capitan app in your Applications folder to the copy destination. Learn how to make a bootable OS X 10.11 El Capitan installer drive I often have to perform OS installations, so I make a bootable flash drive that I can use it’s a lot faster than waiting for the download. But I like to make a copy of the installer. You can now quit Terminal and eject the volume.If you ever need the installer again, you can get it in the App Store. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Sonoma.After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume.Terminal shows the progress as the volume is erased. When prompted, type Y to confirm that you want to erase the volume, then press Return.Terminal doesn't show any characters as you type. When prompted, type your administrator password.If the volume has a different name, replace MyVolume in the command with the name of your volume.

Each command assumes that the installer is in your Applications folder, and that MyVolume is the name of the USB flash drive or other volume that you're using. Type or paste one of the commands below into Terminal, then press Return to enter the command.Open Terminal, which is in the Utilities folder of your Applications folder.