For Linux – Detailed guide

If you are unsure which device that is your USB, do the following

A) Remove USB

B) Redo 'df -h' 

C) Plug USB back in

D) df -h

E) Compare the two above and see which line is new, it will be similar to:

/dev/sda1     15G     991M     14G     7%     /media/orcus/My-USB

It is important that you find the exact location of your USB, because you will need it in the next step.

5. Execute <dd> to create bootable USB

$ sudo dd if=/home/orcus/eosio-live-02.iso of=/dev/sdc1 bs=4M && sync

if=<point to ISO file> 
of=<point to USB, i.ex. /dev/sdc1>

Wait until you receive a final message, may take a while. (depending on version, numbers may differ)

398+1 records in
398+1 records out
1671553024 bytes (1,7 GB, 1,6 GiB) copied, 164,661 s, 10,2 MB/s

You have now created your USB and can unplug or turn off computer.