I want to post my experience.
It took me a while to understand how to create a live-usb with arch linux. The solution is simple. I just wrote:
$ dd if=/adress/of/iso-file of=/adress/of/usb-stick/sda/not/sdaY/don't/write/the/partition/number
I worked a lot with gnome disk utility and gparted. It's okay to clear the partition table of the USB-Stick.
One interesting fact is important. If dd ends with just 100-400 files, then something went wrong. Sometimes it took more time but I abborted because I didn't want to wait so long. Then I did once until it's finished. I'm sure it took about 20 minutes that time and suddely dd shows up with about 10000 files correctly transmitted. I booted the stick and everything works fine. I didn't know about the amount of files and I think if you do it the way I did (as you can see I didn't use the bs=part) and wait about 30 minutes, everything should be fine.
An USB 3.0 stick really can help you.