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 should start up from the macOS installer CD/DVD media. How to start up your Mac from a bootable CD/DVDġ) Firstly, turn on your Mac, or restart it if it’s already on by choosing Restart in the Apple menu.Ģ) 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 Apple’s Super Drive or a USB thumb drive formatted with a GUID partition type and containing a macOS installer or a usable operating system.Īpple advises against booting from external storage containing a version of macOS earlier than the one your Mac shipped with.If you have multiple internal hard drives, you can select a different hard drive from the one running macOS and create a single partition on that drive to use solely for Windows.Starting up your Mac from an external disk requires the following: This process may take a long time to complete (you can click the Stop button to interrupt this process).Īt the Create a Partition for Windows step, specify a partition size by dragging the divider between the macOS and Windows partitions. The Windows files are copied to the USB drive. This process may take a long time to complete (you can click the Stop button to skip this process).Īt the Select Tasks step, select all the tasks, then click Continue.Īt the Create Bootable USB Drive for Windows Installation step, choose the Windows ISO image and the USB drive, then click Continue. Older Time Machine snapshots and cached iCloud files are removed to make space for Boot Camp.
The system is checked for total available disk space. On your Mac, open Boot Camp Assistant, located in /Applications/Utilities.Īt the introduction screen, click Continue.
Important: If you’re using a Mac notebook computer, connect it to a power source before continuing.Ĭonnect an external USB drive or insert a flash drive into the USB port on your Mac keep it connected or inserted while you install Windows and the Windows support software.
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