I've been setting up My computer etc to be able to run Damn Small Linux from a USB.

I've gone through the steps very carefully and I have checked to make sure the files are in fact on the USB.
SO I reboot my computer and hit F12 for the boot menu, opt for hard ware or w.e and Sure enough there says : HDDB San disk cruzer ( or somthing darn close to that ;) )

I click to boot through that but then The screen says boot from CD: ....
Please insert CD and hit enter.

IIf anyone knows why it might be doing so please tell me :(

SSDF