Instructions on how to make a linux boot disk from and ISO
Release : 3.3
if using Rufus take the iso image an convert it to img use the dd command
ex: dd if=/path/to/<file bane>.iso of=/path/to/<file name>.img
Then use Rufus 2.18 select DD image the select the file.img
Alternatively, you can use netbootin to make the image from ISO
1) Select Disk Image
2) Select ISO from the drop down
3) identify the ISO to burn to the USB drive