Booting from an external DVD drive using Firewire Target Disk Mode

This is documented by Apple but I had never realized it: if you put a Mac in Firewire Target Disk Mode, its DVD drive is also available, and it can be used to boot, for example, a machine that does not have a DVD drive (hold down Option while turning the machine on to access the Startup manager). Very useful! Somehow I had always assumed only the machine’s hard drive was visible in TDM.

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