先至freebsd網站 https://download.freebsd.org/releases/ISO-IMAGES/

下載合適的memstick.img檔.

如:要下載12.4,找到FreeBSD-12.4-RELEASE-amd64-memstick.img
先按MOUSE右鍵複製連結網址

如上面可以取得https://download.freebsd.org/releases/ISO-IMAGES/12.4/FreeBSD-12.4-RELEASE-amd64-memstick.img

先在一台freebsd的主機用wget https://download.freebsd.org/releases/ISO-IMAGES/12.4/FreeBSD-12.4-RELEASE-amd64-memstick.img

將檔案下載至FreeBSD目錄，插入要製作的USB,查/dev下da開頭的DEVICE

如看到/dev/下有da0或da1

#dd if=FreeBSD-12.4-RELEASE-amd64-memstick.img of=/dev/da0 bs=1m conv=sync
跑一段時間後再回到#就可以使用了。