#Ultimate boot cd for mac how to#

Release the key after Startup Manager appears.

If your USB thumb drive,В USB external disk or flash storage contains a usable operating system or a macOS installer, you can select it at boot time usingВ macOSвЂ™ built-in feature called Startup Manager, which can be invoked via a simple keystroke.Дў)В Press and hold the OptionВ key immediately upon hearing the startup chime.

#Ultimate boot cd for mac how to#

How to start up your Mac from an external USB storage device Tip: You can easily burn a bootable image of macOS to a DVD using Disk Utility. You can also press the left mouse button on a wired mouse during startup to open the disc tray. Your Mac shouldВ start up from the macOS installer CD/DVD media. How to start up your Mac from a bootable CD/DVDДЎ) Firstly, turn on your Mac,В or restart it if itвЂ™s already on by choosing Restart in the Apple menu.Дў)В Secondly, press and hold the C key on your keyboard immediately upon hearing the startup chime. Bootable optical media (CD or DVD) on Macs equipped with AppleвЂ™s Super Drive or a USB thumb drive formatted with a GUID partition type and containing a macOS installer or a usable operating system.ДЄpple advises against bootingВ from external storage containing a version of macOS earlier than the oneВ your Mac shipped with.Starting up your Mac from an external disk requires the following: