yep...usually on the inboard side of the rotors.
have seen it on ford and nissan and gm too...

apparently as the car companies try to lighten or save money or what not, some say to eliminate brake noise since no more asbestos pad material, the rotor material has changed. construction tto, as you can now find cast iron and steel and other alloys on 1 rotor (hub is different material than rotor surface).

I suppose these odd alloys etc are the cause of all this premature rusting - how bad is it? well, besides pitting, you will find what i call 'rust creep ' the non-swept ares of the rotors (outer and inner edges where the pads don;t touch) get rusty, and then that rust grows into the pad swept area. ihave seen this rust go nearly 1/2 inch, chews up the pads of course and reduces braking.

i have not been able to figure out how a surface that is rubbed by the brake pad multiple times a day can rust away like that!

Go to any nissan car lat and look at most any car that has been sitting a week - you will see rusty rotors. i mean RUSTY rotors.