A circuit is adapted to activate a writer head of a data storage media
drive during both the boost periods as well as the steady state periods.
The current supplied to the writer head during the boost periods exceeds
the steady state current and flows between positive and negative voltage
supplies so as to provide the required magnetic flux change in the
inductor disposed in the write head. During the steady state periods, a
switch circuit is turned on to provide a second current path across the
writer head. During the steady state periods, the current flows between
the positive voltage supply and the ground to reduce power consumption.
The switch circuit is turned off during the boost periods.