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.
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.