For a complete burning techniques, refer Fedora: How to Create and Use Live USB
Startup disk creatoronly works for Ubuntu ISOs.
Disk Utility to get know of where your usb is mounted. In my case, it is
/dev/sdc, and the name of downloaded Fedora iso file is there in the command line.
sudo dd bs=4M if=Fedora-Live-Desktop-x86_64-19-1.iso of=/dev/sdc
dd is in
bs mode, which means it write in BYTES at a time.
Aside (From USB img to HD)
dd can also copy iso image from USB to your hard disk:
sudo dd if=/dev/sdb of=usb-image.iso