Why are the scorch marks...?

Does anyone know what I have to do to fix this......there are black marks right on the center about one inch wide all around the rotors......I see also that there are small little dots that are etched into the rotor........Could it be that something is rubbing, and what could this be?

Did someone say Scotch? Don't mind if I do... :cheers:

where'd you get the bush?

A friend sent it to me... it's a clip taken from an interview with him while they were on commercial break. I wish he could actually do it on tv for real, tho.