Hello,
Ive been testing my new Patriot 32gb Autobahn usb flash drive in my radio for a month now without any problems at all.
Package says its made for cars . Smaller than a quarter. It is very low profile. Slides in all the way up to the barrel and has a great quality body. Plus it dose not get hot while playing music like other brands Ive used.

There are other sizes too. 8gb 16gb

Picked mine up a frys.

 

Nice looking device. Also on amazon for $16, but $30 in the Canadian version of amazon. List price = $20.

 

Glad it works , enjoy those tunes!

 

Forgive my ignorance, but where does it go?

 

A USB Flash drive goes into the USB port on the cars radio. (if you have a USB port equipped radio )
Me personally, I just use that port for charging up my cell phone.

 

Aha! I didn't realize there were usb port equipped radios. I'm just going to start researching audio equipment. I know I want something loud and want to really feel the bass. But I don't want to take up room in the back so I might be limited.