If you own a Mac with an M1, M2, or M3 chip, this is not possible. Apple Silicon Macs do not support Boot Camp. They require virtualization software (like Parallels Desktop or UTM) to run Windows on ARM. This guide is specifically for those holding onto older Intel MacBooks and iMacs who need a portable Windows solution.
Before diving into the "how," we must address the "if." install bootcamp on external drive
Ensure that you have backed up any important data on the external drive, as the process will erase all data on the drive. If you own a Mac with an M1,
Connect your external SSD to your Mac. Open Disk Utility , select the drive, and erase it. Use the "ExFAT" or "MS-DOS (FAT)" format scheme to ensure it is clean. Ideally, use the GUID Partition Map scheme. This guide is specifically for those holding onto