Yep. Mhans311 is right. Actually, you can do this same thing for all the folders on your X ... no special apps needed.
Another thing, too -- when you hook up your X to your computer via USB Mass Storage Mode, you will get a request to install a Moto desktop program. DON'T DO IT! Just click cancel. It doesn't do anything but get in the way. You have to cancel out of it every time you plug in the USB. Annoying, but worth it. If it's already installed, don't use it OR uninstall it.