Seagate Technology Incorporated

Victor Chi Siang Choo

Poh Lye Lim

Niroot Jierapipatanakul

Beng Wee Quak

PohLye Lim

Michael Joo Chiang Toh

Kwee Teck Say

Chee Suan Low

Boon Seng Ong

Yu Nang Zai

Niroot Jicrapipalanakul

An apparatus and method for balancing a disc stack assembly of a disc drive where a clamp is used as a counter-balance as well as for securing a disc to the disc stack assembly. The clamp and spindle motor are configured for positive engagement and alignment with the use of a minimal number of parts. The clamp includes a cavity through which a protrusion or a shaft of the spindle motor hub may extend. The clamp may be further secured in a desired orientation by the use of a single fastener.

Disk clamp balancing in a disc stack assembly

A disc fixing apparatus and associated methodology for fixing a data storage disc in rotation with the hub of a motor that is rotatable around a motor axis of rotation. The disc fixing apparatus comprises a clamp engaging the hub and comprising a reference surface associated with the clamp axis of rotation. A fastener comprising a registration feature cooperates with the reference surface, registering the clamp with the fastener. The fastener is attached to the motor hub fixing the disc and hub in rotation and registering the clamp to the motor axis of rotation. An associated method is provided for fixing a disc in balanced rotation with a rotatable hub of a motor around a motor axis of rotation. The method comprises providing the clamp member comprising the reference surface associated with the clamp axis of rotation; registering the clamp member with the longitudinal axis of the fastener; aligning the fastener and clamp together with the hub; and attaching the fastener to the hub so as to register the clamp member with the motor axis of rotation.

Disc fixing apparatus and associated method fixing a disc and motor in balanced rotation

A method for minimizing unbalance in the disc pack of a disc drive where the unbalance of the spindle motor is quantified and incorporated into the biasing assembly of the disc pack. In the assembly process, the discs are biased in a manner such that the unbalance of the spindle motor is considered.

Disc biasing scheme to minimize single plane unbalance for hard disc drives

The present invention provides a magnetic shield that would reduced the magnetic flux leakage from the base of the spindle motor to the printed circuit board assembly (PCBA) in a disc drive. The magnetic shield integrated in the disc drive as part of the spindle motor without increasing costs to assembly of the disc drive. The magnetic shield is made of layers of different materials to provide effective shielding. The magnetic shield is designed such that shielding effect is not affected during temperature changes in the disc drive.

Magnetic shield for flux leakage reduction from spindle motor

The present invention provides a disc clamp for use with a disc stack assembly where the disc stack assembly is designed for rotation about an axis. The disc clamp includes a set of openings defined by a body, such that each opening has line symmetry about a line of reflection that intersects the axis. The disc clamp also includes a set of flanges, each which extends from the body into one of the openings. The disc clamp is made such that the set of openings has rotational symmetry about the axis and the set of flanges is rotationally asymmetrical about the axis.

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Singapore, Singapore

Victor Chi Siang Choo