Even if the rotor is held by magnetic fields, the centrifugal forces exerted on the rotor must be huge. I guess it is small enough, but I'm curious if it was a

Even if the rotor is held by magnetic fields, the centrifugal forces exerted on the rotor must be huge. I guess it is small enough, but I'm curious if it was a problem or not (CDs will crack if they spin too fast).