The easiest way to 'burn' iso to USB disk.

The easiest way to 'burn' iso to USB disk is by using dd command. Let's say you don't want to burn your newly downloaded iso to CD/DVD but want to use USB disk instead, you can run this command :

dd if=/path/to/file.iso of=/dev/sdb

This assumes your USB disk is /dev/sdb. You can use mount command to check what device your USB disk is using. Now you can install your new distro using USB disk.

Note: You can burn iso this way if the iso is of type hybrid. Read here for more information.

Have fun!