Just use a normal Windows 10 install USB without Boot Camp Boot Camp guides you through this but it’s easy to do manually with Disk Utility. Please note that if you’re using APFS you’ll need to use macOS or macOS Recovery to resize your macOS partition first. I’m going to include all of them, in an attempt to save you the hassle of it breaking things, if you’re trying this for yourself. I tried a lot of these before I found something that worked. I haven’t tried it, though, so don’t quote me on that. Please Note: Newer Intel Macs do actually have EFI 2/UEFI firmware, and install Windows in EFI mode, so this (hopefully!) isn’t a problem on them. This is all absolutely fine, but poses a problem when you then install Linux – the Mac will boot Linux in EFI mode, and then, when installing, Linux clobbers Windows’ bootloader, thinking that Windows is installed in EFI mode! GRUB (Linux Mint’s bootloader) is also unable to load Windows like this, so that’s a second problem to solve. Doing a standard Boot Camp setup with macOS and Windows works just fine, but the caveat is that this installs Windows in BIOS/CSM mode. However, this Mac uses EFI 1.1 firmware, instead of the much more ubiquitous and better-supported EFI 2.0/UEFI spec. You’d think the answer would be yes, and you’d be right for more modern Intel Macs (probably). Can’t you just use Boot Camp for tri-booting? This isn’t a specifically Linux-oriented post, but it does fit with the sort-of miscellaneous hopefully-interesting things I post about here.
At first I was going to make a howto, but the process ended up being so bizarre and confusing that instead I’m just going to write about the experience. A little while ago I decided to try tri-booting macOS Big Sur, Windows 10, and Linux Mint 20.3 on an older Late 2013 MacBook Pro in order to do some performance and battery life comparisons (coming soon!).
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