Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra.A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan.A USB flash drive or other secondary volume, formatted as Mac OS Extended, with at least 12GB of available storage.What you need to create a bootable installer Universal USB Installer is a simple application allowing us to create, in two simple steps, our own Linux installer to have in the pendrive.Your Mac will reboot from the USB instead of your default startup disk.
Set your bootable USB as your startup disk for the next boot in “Apple Menu - System Preferences - Startup Disk,” then click “Restart” to reboot your Mac. But running off a USB drive is invariably slower than running off an internal SSD.The macOS installer file is large with approximate size of 6 to 10GB depending upon the.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. These advanced steps are primarily for system administrators and others who are familiar with the command line.
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