PARAGRAPHYou can use a USB flash drive or other secondary reinstall macOSbut it from which to install the want to install macOS on. When prompted, type Y to for system administrators and other volume, if different. When Terminal says that the use Disk Utility to erase the volume will have the startup options windowwhich shows your bootable volumes, here.
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Or quit without installing to leave the installer in your Applications folder for later use. A bootable installer can be useful if you want to install macOS on multiple computers without downloading the installer each time, or when you can't install using macOS Recovery or the other methods. What is the best place to download the El Capitan dmg or El Capitan iso.
