Patent ID: 6738215
Filing Date: 2004-05-18
Classification: G11B

Abstract:
Magnetic disk drive apparatus, comprising:a disk medium having a first and a second surface, each including a plurality of recording tracks having a certain track width, and at least one of the first and second surfaces of the disk medium including a plurality of preliminarily recorded reference servo data; a first pair of head elements facing close to the first surface of the disk medium for writing a first servo data and/or reading the reference servo data; a second pair of head elements being located symmetrically to the first head element facing close to the second surface of the disk medium for writing a second servo data and/or reading the reference servo data; a head positioner for alternately determining a first and second head position for data writing on the respective surfaces by calculating a first relative position between the second head element and the second surface, based on the reference servo data or the second servo data read by the second head element, and by calculating a second relative position between the first head element and the first surface based on the reference servo data or the first servo data read by the first head element; a head mover for alternately carrying the first or second head element to the data writing position on respective surfaces of the disk medium determined by the head positioner; and a servo data writing controller for controlling the respective servo data writing on the respective data writing positions on the respective surfaces of the disk medium by the respective head element.