Is it possible to add a disc brake to a wheel that has inserts for a rotor?

I'm fairly new to mountain biking and friend told me i should get disc brakes instead of the rim brakes that came with my bike. My front fork and back both have spots for a disc brake caliper however my wheel does not have a place to screw in the rotors. is there some type of adapter or something that can... show more I'm fairly new to mountain biking and friend told me i should get disc brakes instead of the rim brakes that came with my bike. My front fork and back both have spots for a disc brake caliper however my wheel does not have a place to screw in the rotors. is there some type of adapter or something that can attach the rotors to my existing wheel or do i need to get a new wheel that has a place for the rotors? thanks!
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