I'm sure I'll upset the apple cart a bit.... but I beg to differ.
Unless there is but one casting for that rotor, it
is rotating the the wrong direction. There was a time when GM produced rotors of directional castings for the Vette which were one sided but used on both sides of the vehicle. I think they finally retooled for that one and made proper dedicated parts....owners didn't take kindly to one side being correct, the other not.
Both show an internal vane structure for Counter Clockwise rotation, not clockwise.
Vented rotors draw air from the center of the rotor and expell it at the outer edge. The rotor does not "bite into" the air flow by way of the outer edge. They work as an air pump flowing outward. Rotor finishes such as slots, holes, both, hooks etc. etc. have no bearing on the rotation- that is dictated by the casting structure only.
Here is an example of proper LEFT rotor or COUNTER CLOCKWISE rotation for correct air flow:
For the average user this is not really going to pose much of an issue. However for harder open track day use air flow is reduced and the rotor will not cool properly. How one chooses to run it is entirely up to you- it won't hurt being backwards.