When you look at the rotor you will see one large hole through the rotor
that lets you see the axle flange. Find a tool like this:
http://tinyurl.com/ovflt
Hold the poited end in your right hand and place the chisel tip end in
the bottom of the hole. Strike the heel of the tool sharply with a 20 oz
ball pein hammer. The rotor will leap off the axle. If it sticks part
way just pry against the axle flange with the tool. If it's still stuck
then grab the rotor on either side and give a healthy jerk. The worst
one I've ever encountered took maybe 20 secs. to remove.
Bob