Patent ID: 7271973

Claim:
A hard disk drive, comprising: a disk that has a radial crown and a radial camber across a surface; a spindle motor that spins said disk and creates a flow of air; a head coupled to said surface of said disk, said head having an air bearing surface that creates an air bearing with a flying height, said air bearing surface compensates an effect of said radial crown and said radial camber of said disk to maintain said flying height of said head across said disk surface, said air bearing surface creates a flying height across a flat disk surface in accordance with the following equation: h ⁡ ( r ) = h - α crown ⁢ L 2 8 ⁢ 1 r ⁢ ∂ z ⁡ ( r ) ∂ r - α comber ⁢ W 2 8 ⁢ ∂ 2 ⁢ z ⁡ ( r ) ∂ r 2 , for UP head Where: h=the original flying height; h(r)=the new flying height; ∂ crown =the head crown sensitivity due to the crown of the disk; ∂ camber =the head camber sensitivity due to the camber of the disk: L=the length of the head; W=the width of the head; z(r)=the radial position of the head on the disk; r=radius of the disk; an actuator arm coupled to said head; a voice coil motor coupled to said actuator arm; and, a controller coupled to said head.