Patent ID: 7027251

Claim:
A disk drive apparatus comprising: at least a first rotatable disk; at least a first arm, having a tip with a write head, positionable adjacent selectable locations of said first disk, wherein said write head is provided with a current varying in a pattern configured to produce desired data recording at said disk; circuitry configured to vary at least a first electrical parameter of said write head of said first arm, different from said pattern, during a substantially continuous data write operation, so as to achieve data writing despite changes in spacing between said tip and said first disk, wherein said circuitry configured to vary a first electrical parameter of said write head of said first arm includes circuitry configured to provide a first current to said write head during a first time period and a second, smaller, current to said write head during a second, later time period, said first current having a magnitude so as to substantially achieve writing of data to a first portion of said disk, said second current having a magnitude so as to both: substantially achieve writing of data to a second portion of said disk; and substantially avoid heating said tip to a degree that would cause contact with said second portion of said disk.