I appreciate the quick response.
However, I've already done the obvious stuff like soak it in penetrating oil on both sides and I hit the heck out of it with a hammer. I even applied some heat with a torch but I stopped because the penetrating oil started to catch on fire.
It's only after I tried all this and looked at pictures of two different rotor types that I asked my question. One oicture looked like the replacement I bought and the other has the middle hole attached to a collar of some type. Therefore I am worried that the middle collar is actually part of the rotor. Either way I need to know how to get it off without ruining anything else.