Disks?

To my knowledge there is no such thing as a disk brake system for road bikes. I've sometimes wondered if they will appear some day but so far.... no. When you think about it having a caliper squeeze the rim is a bit primitive but I guess the rim is already there for the squeezing as opposed to a disk which has to be added, thereby heavier, more stuff, wider, less aero. Naw, let the gorrillas on the MTBs keep there disks.