Chiao-Ping Ku

6363777, Apr 2, 2002

Feb 3, 2000

09/497371

Alex Yu-Chih Tsay - Fremont CA
Chiao-Ping Ku - Fremont CA
Thomas R. Prentice - Luther CA

Seagate Technology LLC - Scotts Valley CA

G01B 528

73105

A glide test head assembly glide test head assembly in which the mounting orientation of the piezo element has been modified. The glide test head assembly mounts the piezo element with one of its major surfaces coincident with the surface of the laterally-extending wing on which it is mounted. The mounting orientation of the piezo element allows the piezo element to be mounted fully on the laterally-extending wing of the glide test head assembly, raising the resonant frequency of the piezo element, decreasing the glide test head assemblys sensitivity to excitation caused by air flow disturbances, and increasing the reliability of glide test results.

6557399, May 6, 2003

Oct 16, 2001

09/981533

Chiao-Ping Ku - Fremont CA
Bruno Jean Marchon - Palo Alto CA

Seagate Technology, LLC - Scotts Valley CA

G01B 734

73105, 29 2335

A disk surface asperities tester including a glidehead member having a piezoelectric sensor fabricated directly on the glidehead member. The piezoelectric sensors are useful in applications utilizing 70%, 50%, 30%, or smaller glideheads. The invention discloses a method for manufacturing sensors utilizing microchip fabrication techniques to form the piezoelectric sensors directly on glidehead surfaces, including standard Al O. TiC glideheads. The fabricated piezoelectric sensors are used in combination with signal processors to detect and analyze asperities in a disk drive surface.

6624966, Sep 23, 2003

May 31, 2001

09/872193

Jin Hui Ou-Yang - San Jose CA
Serge Hauert - San Jose CA
John R. Gustafson - Los Gatos CA
Chiao-Ping Ku - Fremont CA
Lin Yang - San Jose CA
Gary C. Griffin - Boulder Creek CA
Aaron D. Little - Campbell CA
Sudha Narayanan - San Jose CA

Western Digital Technologies, Inc. - Lake Forest CA

G11B 3314

360 9702

A disk drive including a disk drive base. The disk drive further includes at least one rotatable disk which includes a disk surface extending to an outer disk edge. The disk drive further includes a head stack assembly rotatably attached to the disk drive base in operable communication with the disk. The disk drive further includes an airflow suppressor comb coupled to the disk drive base and stationary relative to the disk drive base during operation of the disk drive. The comb includes a comb body disposed adjacent to the outer disk edge, and at least one tine extending from the comb body along the disk surface for mitigating disk rotation induced airflow upon the head stack assembly adjacent to the disk surface.

6663938, Dec 16, 2003

Dec 11, 1998

09/210018

Wei H. Yao - Fremont CA
Yuh-Jen Cheng - Cupertino CA
Li-Ping Wang - Fremont CA
David S. Kuo - Castro Valley CA
Chiao-Ping Ku - Fremont CA
Bruno Marchon - Palo Alto CA

Seagate Technology LLC - Scotts Valley CA

G11B 582

428141, 428 642, 428 653, 428426, 428694 SG, 360135

A magnetic data recording medium substrate has a contact zone and a data zone. The contact zone is textured by forming multiple texturing features, each having a bell-shaped profile resembling a Gaussian curve. The features preferably are formed by pulsed laser energy applied to a glass substrate, or to an aluminum nickel-phosphorous substrate coated with a glass layer. As compared to previous laser texturing approaches, the laser beam is less narrowly focused to provide a beam impingement area with a diameter of at least three microns, forming texturing features with diameters of at least three microns. The texturing features preferably are uniform in height and diameter, and may be symmetrical or have asymmetrical aspects, so long as bell-shaped profiles are present in the direction of travel of the recording medium, relative to transducing heads.

6965500, Nov 15, 2005

Feb 22, 2002

10/080786

Aaron J. Hanna - San Jose CA, US
Lin Yang - San Jose CA, US
Jin Hui Ou-Yang - San Jose CA, US
Chiao-Ping R. Ku - Fremont CA, US

Western Digital Technologies, Inc. - Lake Forest CA

G11B005/55

360245, 3602451, 3602453

A disk drive includes a head gimbal assembly that includes structure that decreases the pitch angle of the load beam, which decreases disk flutter induced track mis-registration. According to one embodiment, the disk drive includes a body portion including a bore defining a pivot axis; an actuator arm cantilevered from the body portion and a head gimbal assembly (HGA) supported at the actuator arm. The HGA includes a load beam having a first end and a second end, the first end being attached to the actuator arm, the load beam defining a load beam feature near the second end, at least a portion of the load beam feature defining an extension that is parallel to the pivot axis and that has a rectangular cross-section having a length to width aspect ratio that is greater than 1. A slider is coupled to a free end of the load beam extension, and a gimbal coupled to the second end of the load beam and to the slider.

7113371, Sep 26, 2006

Feb 22, 2002

10/080849

Aaron J. Hanna - San Jose CA, US
Lin Yang - San Jose CA, US
Jin Hui Ou-Yang - San Jose CA, US
Chiao-Ping R. Ku - Fremont CA, US

Western Digital Technologies, Inc. - Lake Forest CA

G11B 5/48
G11B 21/16

3602448, 3602442

Disk drives including suspensions and head gimbal assemblies in which the load beam pitch angle is reduced exhibit a reduced disk flutter induced track mis-registration (TMR) at the disk outer diameter. The reduction in the load beam pitch angle may be achieved through variations in the load beam, hinge and/or mount plate configurations, relative positions and/or thickness.

7212377, May 1, 2007

Mar 31, 2004

10/815507

Jin Hui Ou-Yang - San Jose CA, US
Lin Yang - San Jose CA, US
Chiao-Ping R. Ku - Fremont CA, US

Western Digital Technologies, Inc. - Lake Forest CA

G11B 17/038
G11B 25/04
G11B 33/14

360 9912, 360 9703, 360 9801, 360 9808

A disk drive includes a disk clamp for clamping a plurality of disks to a spindle motor, and a disk spacer positioned between first and second disks. The first disk has a plurality of first disk through apertures adjacent its inner diameter. The first disk through apertures are circumferentially spaced-apart and extend longitudinally through the first disk. The disk spacer has a plurality of spacer apertures that are circumferentially spaced-apart and extend longitudinally through a portion of a thickness of the disk spacer. The disk clamp is adjacent to the first disk and has a plurality of clamp through apertures adjacent an outer diameter of the disk clamp. The clamp through apertures are circumferentially spaced-apart and extend longitudinally through the disk clamp. The first disk through apertures, the spacer apertures, and the clamp through apertures are aligned for allowing airflow to pass through when the plurality of disks is rotating.

7224551, May 29, 2007

May 15, 2004

10/846041

Jin Hui Ou-Yang - San Jose CA, US
Lin Yang - San Jose CA, US
Chiao-Ping Ku - Fremont CA, US

Western Digital Technologies, Inc. - Lake Forest CA

G11B 17/02

360 9808, 360 9703

A disk drive includes a base, a spindle motor attached to the base, the spindle motor including a hub having hub apertures, a plurality of disks on the spindle motor and including a first and a second disk, a disk spacer between the first and second disks, and a disk clamp. The disk spacer has a plurality of spacer through apertures. Each of the spacer through apertures extend radially through the disk spacer. The disk clamp has clamp through apertures adjacent to an inner diameter of the disk clamp. Each of the clamp through apertures extend longitudinally through the disk clamp. The clamp through apertures, the hub apertures and the spacer through apertures are aligned for allowing airflow to pass through the apertures when the disks are rotating.