does anyone know if the OEM rotors are directional or not meaning they have "cuts" or groves" that make the left side different then the right side?

reason I am asking is the rotor on my front right has an arrow that is pointing < way (backwards) not -> forward.

 

Yes they are directional but I think mainly because of the way the are made, since the hubs turn in slightly. I don't think mounting them backwards that way would affect a whole lot.