https://forums.freebsd.org/threads/making-dos-bootable-usb-hard-disks.19336/
Making DOS bootable USB hard disks | The FreeBSD Forums
There are a number of guides online that show one how to create DOS bootable USB floppy disks, but these all follow the same theme: Obtain preformatted...
usb hard disksmakingdosbootablefreebsd