Another type of rotor is a part of wheel mounting unit which is directly mounted to the axle with ball bearing. This type is more likely to be stucked with the axle. To loose it, you need to remove the bearing nuts, and then loosen it by using a special tool whick is attached to the wheel mounting tread with nuts, but a center moving hammer allows you to yank it outwards. If you need it, check the Autozoon to see if you can loan one for free.
Good luck.