David D Nguyen

US Patent:

6791785, Sep 14, 2004

Filed:

Feb 28, 2001

Appl. No.:

09/796920

Inventors:

Carl R. Messenger - Mission Viejo CA
David D. Nguyen - Fountain Valley CA

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 555

US Classification:

360 7804, 360 7809, 360 7807, 360 7806, 360 9702, 360 31, 318634, 318265, 318560, 318561

Abstract:

A controller for a disk drive that accesses a look up table having a plurality of thermally characterized values corresponding to a plurality of seek operations. For each seek operation, the corresponding value is added to a register. The controller decrements the register at a rate that is determined using servo interrupts occurring as a result of the rotation of the disk. When the value of the register exceeds a threshold, the controller adjusts the subsequent seek operation so as to inhibit damage to the voice coil as a result of overheating.

US Patent:

6885514, Apr 26, 2005

Filed:

Jul 31, 2001

Appl. No.:

09/920665

Inventors:

Raffi Codilian - Irvine CA, US
William D. Johns - Dana Point CA, US
Charles A. Park - Aromas CA, US
David D. Nguyen - Fountain Valley CA, US
Jack M Chue - Los Altos CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B027/36
G11B021/02

US Classification:

360 31, 360 75, 2960309

Abstract:

A method of manufacturing a disk drive and a disk drive made with such method where the width of the read element and the width of the write element are both measured at servo-writing time and the track pitch of the disk drive is set on the basis of those measurements. Disk drives with superior head width combinations are servo-written with a narrower track pitch in order to have a higher storage capacity. Disk drives with inferior head width combinations are detected before servo-writing so that the disk drive may be servo-written with wider track pitch rather than with a nominal track pitch that results in a subsequent drive failure during initial burn-in (IBI). The heads are used more efficiently in that heads that are more capable are used to their ability and less capable heads that would otherwise be disposed of are used at all. Fewer disk drives are required to be reworked and returned to the servo-writing process.

US Patent:

6967811, Nov 22, 2005

Filed:

Jul 2, 2004

Appl. No.:

10/884559

Inventors:

Raffi Codilian - Irvine CA, US
David D. Nguyen - Fountain Valley CA, US
Alexander Babinski - Aliso Viejo CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B005/596

US Classification:

360 7806

Abstract:

A disk drive comprising a first seek operating mode to move the actuator over a seek distance D in a seek time T, using a first seek profile for minimizing T, wherein for a first repetitive series of seeks over distance D a servo control system would require a delay time Tbetween seeks to control temperature rise in a VCM. A second seek operating mode to move the actuator over the seek distance D in a second seek time Tusing a second seek profile for limiting the temperature rise in the VCM, wherein for a second repetitive series of seeks over the seek distance D, a time average Tof the Tseek times is substantially less than T+T.

US Patent:

7035026, Apr 25, 2006

Filed:

Nov 1, 2004

Appl. No.:

10/978644

Inventors:

Raffi Codilian - Irvine CA, US
William D. Johns - Dana Point CA, US
Charles A. Park - Aromas CA, US
David D. Nguyen - Fountain Valley CA, US
Jack M. Chue - Los Altos CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 27/36
G11B 21/02

US Classification:

360 31, 360 75, 2960309

Abstract:

A method of manufacturing a disk drive and a disk drive where the width of the read element and the width of the write element are both measured at servo-writing time and the track pitch of the disk drive is set on the basis of those measurements. Disk drives with superior head width combinations are servo-written with a narrower track pitch in order to have a higher storage capacity. Disk drives with inferior head width combinations are detected before servo-writing so that the disk drive may be servo-written with wider track pitch rather than with a nominal track pitch that results in a subsequent drive failure during initial burn-in (IBI). The heads are used more efficiently in that heads that are more capable are used to their ability and less capable heads that would otherwise be disposed of are used at all.

US Patent:

7054098, May 30, 2006

Filed:

Jun 1, 2004

Appl. No.:

10/860339

Inventors:

Jie Yu - Irvine CA, US
David D. Nguyen - Fountain Valley CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 5/596

US Classification:

360 7806, 360 7804

Abstract:

A disk drive is disclosed comprising a disk, an actuator arm, a head connected to a distal end of the actuator arm, and a voice coil motor (VCM) for rotating the actuator arm about a pivot to actuate the head over the disk, wherein the VCM rotates the actuator arm into a latched positioned when the disk drive is idle. Disk drive control circuitry unlatches the actuator arm by applying a driving current to the VCM according to an open-loop current profile. The open-loop current profile comprises an acceleration pulse having an acceleration magnitude and an acceleration interval, and a deceleration pulse having a deceleration magnitude and a deceleration interval. The deceleration magnitude is substantially smaller than the acceleration magnitude, and the deceleration interval is substantially longer than the acceleration interval, to thereby attenuate acoustic noise when unlatching the actuator arm.

US Patent:

7064918, Jun 20, 2006

Filed:

Oct 31, 2003

Appl. No.:

10/698273

Inventors:

Raffi Codilian - Irvine CA, US
David D. Nguyen - Fountain Valley CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 21/02

US Classification:

360 75

Abstract:

A method for reducing a servo channel head gain calibration time comprising initiating a servo channel head gain calibration process for a head corresponding to the selected disk surface; obtaining a head gain calibration value for a pre-selected zone in the selected disk surface; comparing the obtained calibration value with a pre-stored calibration value for the pre-selected zone and generating a comparison result; and stopping the calibration process for the head if the comparison result does not exceed a threshold value.

US Patent:

7253582, Aug 7, 2007

Filed:

May 28, 2004

Appl. No.:

10/856320

Inventors:

Jianghong Ding - Lake Forest CA, US
Chuanwen Ji - Irvine CA, US
David D. Nguyen - Fountain Valley CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G05B 1/06

US Classification:

318652, 318273, 318259, 360 7303, 360 741

Abstract:

A disk drive is disclosed comprising a spindle motor having a plurality of windings including at least a first winding, a second winding, and a third winding. During a spin-up operation, a voltage is applied to the first winding and a first rise time is measured for current flowing through the first winding to reach a predetermined threshold. A voltage is applied to the second winding and a second rise time is measured for current flowing through the second winding to reach a predetermined threshold. A voltage is applied to the third winding and a third rise time is measured for current flowing through the third winding to reach a predetermined threshold. A difference is computed in response to the first rise time, the second rise time, and the third rise time, and an angular position of the spindle motor is estimated by computing an arctangent in response to the difference.

US Patent:

20020136214, Sep 26, 2002

Filed:

Aug 14, 2001

Appl. No.:

09/930886

Inventors:

Cuong Do - Anaheim Hills CA, US
David Nguyen - Buena Park CA, US
Lan Nguyen - San Diego CA, US
Nhut Ha - Los Angeles CA, US
Tudo Do - Reseda CA, US

Assignee:

Consumer Direct Link - Irvine CA

International Classification:

H04L012/28
H04L012/56

US Classification:

370/392000, 370/401000, 370/338000

Abstract:

A pervasive computing network is disclosed including a group of first access controllers connected together on a first local area network, with each of the first access controllers including a radio frequency transceiver constructed to transmit and receive radio frequency signals within a range less than about 100 meters and wherein at least two of the ranges of the first access controllers overlap one another and the first access controllers are constructed to communicate with a consumer touchpoint device. The pervasive computing network further includes a group of second access controllers connected together on a second local area network, each of the second access controllers including a radio frequency transceiver constructed to transmit and receive radio frequency signals within a range less than about 100 meters, with at least two of the ranges of the second access controllers overlapping one another and the second access controllers being constructed to communicate with the consumer touchpoint device. The pervasive computing device is further provided with both a first communication line connecting the first group of access controllers to a wide area network; a second communication line connecting the second group of access controllers to the wide area network; and a knowledge center connected to the wide area network in communication with the group of first access controllers and the group of second access controllers, the knowledge center being configured to communicate with the consumer touchpoint device by pushing unrequested data to the consumer touchpoint device when the consumer touchpoint device is within one of the ranges of the group of first access controllers and the group of second access controllers.

Address:

10605 Kemerton Rd, San Diego, CA 92126

VIN:

JTHBF5C26A2099591

Make:

LEXUS

Model:

IS 250

Year:

2010