  We calculate the orbital linear magnetic response of disordered metallic
rings to an Aharonov-Bohm flux using the BCS model for attractive
electron-electron interaction. The contribution of all levels including those
up to a high energy cutoff results in a much larger value than previously
obtained using the local interaction model. The possible relevance of our
results to the resolution of the discrepancy between the experimental and
theoretical values for the ensemble-averaged persistent currents in these
systems is discussed.
