Patent ID: 7253989

Claim:
A disk drive comprising: an actuator including a head; a disk having an outer diameter (OD) and an inner diameter (ID) and a plurality of tracks therebetween, the disk being divided into a plurality of track zones each having a plurality of tracks; and a processor for controlling operations in the disk drive including a seek operation from a first track to a second track in which the head is moved between the first track and the second track by movement of the actuator, the processor being connected to the actuator by a flex circuit cable, the processor under the control of a program to: apply a control signal for the seek operation to command the actuator to move the head from the first track to the second track; apply a bias signal to the control signal to approximate the bias imparted by the flex circuit cable, the bias being determined from a data structure, the data structure storing: bias values for each of the track zones representative of a first bias curve to approximate a bias imparted by the flex circuit cable upon the actuator as the actuator moves the head from the OD to the ID; and bias values for each of the track zones representative of a second bias curve to approximate a bias imparted by the flex circuit cable upon the actuator as the actuator moves the head from the ID to the OD; wherein the bias values representative of the first and second bias curves are determined based upon a non-linear apportionment of track zones.