a circuit for use in a mass data storage device has first second current driver circuits for providing write currents to the data transducer . the first and second current levels are different , the second current level being lower than the first . the first current driver circuit may be used to apply currents representing user data to the data transducer and the second current driver circuit may be used to apply currents representing servo information to the data transducer . in addition , the first and second current drivers circuits may be operated at different frequencies . the first and second current driver circuits additionally may share at least some circuit components , and may operate at different write speeds .