Abstract: A compact disk drive useful with a laptop computer comprises at least one glass disk, thin film read/write heads and a head actuator preferably made of magnesium material. The drive motor hub and hub flange are made of steel and the magnet housing for the actuator is made from an integral steel unit. A flexible cable assembly, which is connected to the read/write head circuits and to external circuitry for data processing and for providing control signals, is formed with two flexible sections. Each section is attached to the head actuator and to stationary posts of the disk drive housing thereby balancing the forces applied to the actuator when it is moved for head accessing. A clamp for holding the disk to the motor hub is designed to minimize distortion and to prevent shifting and misalignment of the disk relative to the center of the motor hub.

Abstract: A servosystem for controlling position of a magnetic head relative to a magnetic storage disk in a disk drive includes first and second feedback loops which provide head position error signals. The first feedback loop includes a head position circuit that processes different recorded Gray coded binary expressions that identify the data tracks on the disk during a track seek mode. The second feedback loop includes a head position circuit which, during the seek and track following modes, processes recorded quadrature servo signals that are interleaved with the data tracks.

Abstract: Tooling for assembling a compact disk drive useful for laptop computers includes a ball swaging fixture for joining head flexures to a head arm/actuator subassembly; and a motor/disk platform and disk clamping means for joining a drive motor to magnetic disks. The ball swaging fixture comprises a ball staking fixture for securing the flexures to the head arm/actuator subassembly. The disk clamping means includes a torque gage for assembling a clamp to the drive motor and motor hub. The tooling allows assembly of a compact disk drive at a single station by a single operator.