A write driver circuit for a magnetic storage medium includes a first
write driver sub-circuit that has an output that communicates with a
first node of a write head. The first write driver circuit includes a
first driver circuit and a first feedback path between the input and the
output of the first driver circuit. A second write driver sub-circuit has
an output that communicates with a second node of the write head. The
second write driver sub-circuit includes a second driver circuit and a
second feedback path between the input and the output of the second
driver circuit. The write driver circuit has a substantially constant
output impedance during operation, balanced differential and common mode
resistances, and a substantially constant common mode voltage across the
write head during operation.