Patent ID: 9275656
Filing Date: 2016-03-01
CPC Classification: G11B

Claim Text:
1. A disk drive comprising: a disk with thin film magnetic material on a surface; an inductive write head for selectively magnetizing portions of the magnetic material on the surface of the disk and creating magnetic transitions to record data bits; a channel system that analyzes a set of data bits to be written on the disk to determine the set of magnetic transitions required to record the set data bits and generates for each transition a corresponding overshoot control signal that selects an overshoot amplitude level from a set of overshoot amplitude values that includes two or more predetermined values, the overshoot amplitude level being selected depending on detection of predetermined patterns of data bits following each magnetic transition with a preprogrammed delay between the write data and the overshoot control signal; and a write driver preamplifier that receives one or more signals from the channel system signal that encode the magnetic transitions for the set of data bits and the corresponding overshoot control signal, and the write driver preamplifier generating an output signal for the inductive write head that applies the overshoot amplitude level based on the overshoot control signal.