This tells the computer to load from the disc rather than from the internal hard drive. The critical part is next: on system boot hold down the C key as the Mac boots up.

In order to boot your Mac from a disk in the CD / DVD drive, you’ll first want to insert disk into the drive, then you can either shut down the Mac, or reboot the Mac. 【Reliable Performance】This premium USB CD/DVD drive is equipped with a 100% new loader, which has powerful error correction, low impedance, and anti-interference capabilities to ensure stable operation without stuttering and flickering, and won't damage your discs.Be sure the disc to boot from is actually bootable, most system restore and installation discs are.(Please use appropriate software to complete it)n not supply sufficient power for this device. 【Multiple Functions】You can use this external CD/DVD +/-RW drive to play movies DVDs, burn/rip CDs, install software/system/DVD games, backup data to CDs/DVDs, and more.【No Power Shortage Issues Anymore】Although most PCs can power this portable CD/DVD player by the single data cable, we still prepare an extra power supply cable in case that some ultra-thin notebooks (such as Surface Pro) can not supply sufficient power for this device.【Compatible with Multiple-OS】 Compatible with Mac OS, Windows 11/ 10/ 8.1/ 7/ XP, and Linux OS, so you can use it on Apple MacBook Pro, MacBook Air, iMac, Mac Mini, Windows 10/8/7/XP & Linux laptops and desktop PCs (NOTE: DO NOT support Chromebook, TV, iPad, Truck, and Car).【Easy to Use】Just plug it into the USB 3.0, USB 2.0, or USB Type-C port, this external CD/DVD player will be recognized by your computer automatically, then you can use a media player or burning software to read or write your CD and DVD disc.

Apple mac dvd drive usb c