Mac Won’t Boot from Bootable Install Disk? This Might Be Why

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Trying to start a Mac from a boot disk but it’s not working? And you’re sure you created the boot drive properly? There may be a few different reasons for this.


Some of the later model Intel Macs have a security chip that offers the prevention of external boot media to be used to startup a Mac. If this setting is enabled on a Mac, the computer will not boot when a USB boot disk or other boot media is used.

Additionally, booting an M1 Mac from external boot disks is different from Intel Macs.

If you’re finding the ability to boot a Mac from an external boot…

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