I am looking for a tool that can make a FreeBSD bootable USB flash drive.
Unfortunately YUMI doesn't have this option.
I prefer a free sofware working in Windows, but Linux and paid solution can also be my 2nd option.
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UNetbootin allows you to create bootable Live USB drives for Ubuntu and other Linux distributions without burning a CD.
It runs on Windows, Linux and Mac OS X. It's licensed under the GNU General Public License (GPL) Version 2 or above, the source code can be found on GitHub.
Here's a screenshot of the program taken from its website:
As you can see, FreeBSD appears in the list of the available distributions.
You might want to give Rufus a try.
It is reported to support FreeBSD and it has (like UnetBootIn) an option which not only lists USB sticks but external hard disks too:
I was in the same situation some time ago and found only 2 solutions, one for Windows one for Linux (Etcher supports 3 major platforms though, I tried only on Linux):
Rufus and Etcher
Flash OS images to SD cards & USB drives, safely and easily.
Etcher is a powerful OS image flasher built with web technologies to ensure flashing an SDCard or USB drive is a pleasant and safe experience. It protects you from accidentally writing to your hard-drives, ensures every byte of data was written correctly and much more.
Source: Etcher Github repository
Etcher homepage: Homepage of Etcher bootable USB creator
From Rufus homepage
Rufus is a utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc.
It can be especially useful for cases where:
you need to create USB installation media from bootable ISOs (Windows, Linux, UEFI, etc.)
you need to work on a system that doesn't have an OS installed
you need to flash a BIOS or other firmware from DOS
you want to run a low-level utility
I like Etcher very much maybe because it was hard for me to find something which does the job in Linux, maybe because of its nice interface. Hope this helps.
EDIT: Unetbootin and the others have never worked for me.
EDIT 2: I just saw you're trying to install from external hdd. Then you might try LILI or Universal USB Installer, as mentioned at this page.