How to Boot Your Computer From a Disc or USB Drive
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Amazon.com: UHNDY External DVD Drive, USB 3.0 CD DVD Burner for Laptop, Type-C CD/DVD ROM +/-RW Optical Disk Drive with 4 USB Ports and 2 SD Card Slots, Ultra Slim, for Mac,
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BIOS/UEFI Setup Guide: Boot from a CD, DVD, USB Drive or SD Card
Booting from a CD or DVD
BootCamp won´t boot from External DVD - NON BOOTABLE DEVICE | MacRumors Forums