USB Issues

[TechNina]

I recently used a USB to put kali-linux 2.0 on my PC and its my only OS, but I am wanting to dual boot with Cyber-Hawk but I need to use the same usb I need help using Linux to clear off the USB and put the downloaded .iso file on my usb one issue that i am having is that the USB is showing that there is nothing on it but when i run

 dd bs=4M if=cyborg-hawk-linux-v-1.1.iso of=/dev/sdb1

It gives me this error

dd: error writing ‘/dev/sdb1’: No space left on device
1+0 records in
0+0 records out
0 bytes (0 B) copied, 0.00634787 s, 0.0 kB/s

I'm not sure if this is a partitioning error or what but I really want to know how to fix this whoever provides a working solution