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How to Create a Bootable Installer of macOS Sierra. Creating the bootable installer requires that the bootable media (a flash drive or external drive) be formatted Make sure the macOS Sierra installer file you downloaded from the Mac App Store is present in the /Applications folder on your Mac. Download a macOS installer, such as macOS Mojave or macOS High Sierra. To download macOS Mojave or High Sierra for this purpose, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6.
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First I should point out that this is a very geeky thing and a dvd will boot much slower than a usb. So if you want a faster boot it would be better to make a bootable usb instead for which instructions are here: Nevertheless some people want to have a bootable dvd too.
Click to expand.As I said before this thread is for instructions for a Sierra dvd ONLY. Not for other systems.
Others have tried to extend this over to High Sierra without success, e.g. In this thread: I personally have wasted several DVDs and blurays trying to make a bootable disk for High Sierra with several methods to no avail. I'm not sure it is possible for High Sierra. We may have come to the end of the road as far as this sort of thing is concerned. I'm just glad I was able to make bootable dvds for Lion, Mountain Lion, Mavericks, Yosemite, El Capitan and Sierra.
It has progressively become more and more difficult to do so though with each release, especially after Mountain Lion. Maybe I'm wrong and someone can come up with a working solution for High Sierra. If so then it would be more appropriate to post the solution into br0adband's thread, rather than this one because that thread is specifically for a bootable iso for High Sierra. Several other methods are also suggested on github, but these don't work either yet to make a bootable dvd or bluray for High Sierra (including the one posted there today, which although gives a bootable iso, it doesn’t boot a dvd - for computers formatted as apfs - although it did boot for computers formatted as hfs+).