Disc drive deflected disc clamp lapping process

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS A disc drive 100 constructed in accordance with a preferred embodiment of the present invention is shown in FIG.
1.
The disc drive 100 includes a base 102 to which various components of the disc drive 100 are mounted.
A top cover 104, shown partially cut away, cooperates with the base 102 to form an internal, sealed environment for the disc drive in a conventional manner.
This assembly is called a head disc assembly (HDA).
The components include a spin motor 106 which rotates one or more discs 108 at a constant high speed.
Information is written to and read from tracks on the discs 108 through the use of an actuator assembly 110, which rotates about a bearing shaft assembly 112 positioned adjacent the discs 108.
The actuator assembly 110 includes a plurality of actuator arms 114 which extend over the surfaces of the discs 108, with one or more flexures 116 extending from each of the actuator arms 114.
Mounted at the distal end of each of the flexures 116 is a head 118 which includes an air bearing slider enabling the head 118 to fly in close proximity above the corresponding surface of the associated disc 108.
The spin motor 106 is typically de-energized when the disc drive 100 is not in use for extended periods of time.
The heads 118 are moved over park zones 120 near the inner diameter of the discs 108 when the drive motor is de-energized.
The heads 118 are secured over the park zones 120 through the use of an actuator latch arrangement 122, which prevents inadvertent rotation of the actuator arms 114 when the heads are parked.
The radial position of the heads 118 is controlled through the use of a voice coil motor (VCM) 124, which typically includes a coil 126 attached to the actuator assembly 110, as well as one or more permanent magnets and return plates 128 which are spaced apart and establish a vertical magnetic field between them in which the coil 126 is immersed.
The controlled application of current to the coil 126 causes magnetic interaction between the permanent magnets 128 and the coil 126 so that the coil 126 moves in accordance with the well known Lorentz relationship