SBP Disc rotor ?

Not sure on the disks set-ups but on the drums the stud goes through the hub and drum and then is swagged to hold them together.

Trying to drive them out is a sure way to enlarge the hole in the hub and risk having the studs turn when you tighten or loosen them in the future.

The only way to get them apart and insure that you do not oversize the holes in the hub is to cut or grind off the head of the stud on the back side and drive them out from the back. When you put new studs in don't swag them and you will be able to separate the rotor and hub in the future.

This will be the perfect opportunity to get rid of the aggravating left hand threaded studs too.