Apple's BootCamp 4 FAQ seems to imply that booting from an external HDD is now possible. 11. Why doesn't my external FireWire, USB, or Thunderbolt disk appear in the Microsoft Windows Startup Disk ...

It's handy to have an external, bootable macOS Ventura installer, but you practically have to fight Apple to make one. Here's what you have to do. In Apple's ideal world, you let your Mac update ...