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Open your Mac or restart the device if you were already using it.Ģ. If you want to boot your MacBook/Air/Pro/iMac from an optical media like CD or DVD you need to follow the steps below:ġ. Apple is against booting Mac from an external storage device, because you may install an older version of OS X than the one you were using. Second, the CD or DVD you are using to boot must contain Apple’s Super Drive or if you are using a USB drive then it should be formatted with GUID Partition, and you are also required to install OS X installer.

First, you have to have an Intel-Based Mac.Part 1: How to Boot Mac from USB Drive/CD/DVDĪctually, it is possible to boot Mac from external drive or a hard drive, but there are a few specific requirements needed for your Mac to become eligible for that process. Apple Cannot Check It for Malicious Software.Software Update Is Required to Connect to Your iPhone Error.Fix Backup and Sync Has Encountered a Fatal Error.Change The Login Screen Wallpaper in Catalina.