on my rx300 i just banged them off with a soft hammer. they were rusted so there was some resistance that i had to break through. keep on it, just dont hit it too hard, sometimes placing a piece of wood on rotor then hitting the wood with a hammer can protect it.
good luck. also, make sure there is not a small screw holding the disk in place. also, use some wd-40 to loosen the grip of rust. not too much now.
Tom
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