How to make usb bootable installer with FreeNAS

How to make usb bootable installer with FreeNAS

Used OS: Mac OS X 10.10

Mac OS X make boot instaler with FreeNAS
https://doc.freenas.org/9.3/freenas_install.html

Download FreeNAS image installer from here:
http://download.freenas.org

I'm using "FreeNAS-9.3-STABLE-201602031011.iso"
http://download.freenas.org/9.3.1/STABLE/201602031011/x64/FreeNAS-9.3-STABLE-201602031011.iso

Put your flash on usb port

Open terminal and type commads:

View unmount of your flash all volumes on disk1 was successful
$ diskutil unmountDisk /dev/disk1

Make usb boot installer
$ sudo dd if=FreeNAS-9.3-RELEASE-x64.iso of=/dev/rdisk1 bs=64k