How do I boot off of an external hard drive in Windows 10 64 bit?

[Ldxrunner]

Greetings to all,

How do I boot off an external drive in Windows 10 64 bit ?

How do I capture the computer image ?

What else do I need to know to do this correctly ?

Thank you.

[Matrix]

Create a bootable external hard drive.

[RolandJS]

While I am a Windows 7 person, I think you can boot off of an external platter-driven hard-drive. If the ext HDD's boot partition(s) been marked Primary and Active, if the ext HDD's Windows partition is Primary -- that just might boot. However, I'm aware that "Windows 10's UEFI" is not at all the same as my "Windows 7's BIOS" -- so quite possibly, all bets are either off or going to be quite difficult.