| 主权项 |
1. An apparatus comprising:
interface circuitry configured to communicate with a magnetic recording head, the magnetic recording head comprising:
a transducer configured to write to a magnetic recording medium during write operations; anda heater, a writer and a laser, wherein each of the heater, writer and laser are configured to affect a protrusion of the transducer; and logic circuitry coupled to the interface circuitry and configured to:
apply a pre-write heater power to the heater before a write operation starts to obtain a target pre-write clearance for the write operation, the pre-write clearance compensating for a protrusion time constant of the heater, the writer, and the laser and is obtained through use of a clearance-heater power curve, wherein the curve is generated by measuring a clearance between the transducer and the medium as the heater is increased from zero power to a contact power; andapply a reduced write power to the heater after the write operation starts, the reduced write power compensating for protrusion of the laser and the writer during the write operation. |
