Jingbo Yu Phones & Addresses
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Fremont, CA
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Sunnyvale, CA
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San Jose, CA
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1146 Falcon Ridge Ct, San Jose, CA 95120
Business Records
Name / Title
Company / Classification
Phones & Addresses
President
LUCKYU INTERNATIONAL FOUNDATION
Civic/Social Association
Civic/Social Association
1146 Falcon Rdg Ct, San Jose, CA 95120
Publications
Us Patents
Method Of Determining Side Track Erasure In A Disk Drive
View pageUS Patent:
7170700, Jan 30, 2007
Filed:
Apr 18, 2002
Appl. No.:
10/125657
Inventors:
Gang H. Lin - San Jose CA, US
Erhard Schreck - San Jose CA, US
Kezhao Zhang - Fremont CA, US
Don Brunnett - Pleasanton CA, US
Duc Banh - San Jose CA, US
Kurt Rusnak - Pleasanton CA, US
Jingbo Yu - San Jose CA, US
Suet Teo - San Jose CA, US
Nick Warner - Livermore CA, US
John Vicars - Longmont CO, US
Erhard Schreck - San Jose CA, US
Kezhao Zhang - Fremont CA, US
Don Brunnett - Pleasanton CA, US
Duc Banh - San Jose CA, US
Kurt Rusnak - Pleasanton CA, US
Jingbo Yu - San Jose CA, US
Suet Teo - San Jose CA, US
Nick Warner - Livermore CA, US
John Vicars - Longmont CO, US
Assignee:
Maxtor Corporation - Longmont CO
International Classification:
G11B 27/36
G11B 5/03
G11B 5/03
US Classification:
360 31, 360 66
Abstract:
A method of determining side track erasure in a disk drive having a disk and a transducer. A target track and one or more side tracks proximate to the target track on the disk are selected, and recording parameters for recording signals on the target track and each side track with the transducer are selected. Thereafter, signals are recorded on each side track and then signals are recorded on the target track multiple times. A reduction in the integrity of the recorded signals on each side track due to recording signals on the target track multiple times is detected, and the detected reduction in the integrity of the recorded signals on each side track represents the amount of the erasure of the recorded signals on the side track. Recording parameters are changed based on the signal integrity reduction to minimize side track erasure.
Method And Apparatus For Performing A Spiral Self-Servo Write Operation In A Disk Drive Using An Auto Detection Scheme
View pageUS Patent:
7212369, May 1, 2007
Filed:
Aug 16, 2004
Appl. No.:
10/920717
Inventors:
Lloyd Levy - San Jose CA, US
Yu Sun - Fremont CA, US
Pang L. Tan - Fremont CA, US
Jingbo Yu - San Jose CA, US
Adrian Cerda - San Jose CA, US
Yu Sun - Fremont CA, US
Pang L. Tan - Fremont CA, US
Jingbo Yu - San Jose CA, US
Adrian Cerda - San Jose CA, US
Assignee:
Maxtor Corporation - Scotts Valley CA
International Classification:
G11B 21/02
US Classification:
360 75
Abstract:
A method and apparatus for providing a temporary utility zone in a disk drive. A disk surface has a write head associated therewith. The write head is used to write spiral servo information and a propagation state indicator onto the disk surface. The spiral servo information and propagation state indicator are used to perform a self-servo write operation on the disk surface.
System For Monitoring And Dynamically Adjusting Head-To-Disk Spacing In A Disk Drive
View pageUS Patent:
7310194, Dec 18, 2007
Filed:
Apr 7, 2005
Appl. No.:
11/101089
Inventors:
Bruce C. Schardt - Stacey CA, US
Erhard Schreck - San Jose CA, US
Jingbo Yu - San Jose CA, US
Michael Mallary - Sterling MA, US
Scott Hughes - Cupertino CA, US
Duc Banh - San Jose CA, US
Kazuhiro Saito - San Jose CA, US
Donald J Brunnett - Plesanton CA, US
Tim Glassburn - Milpitas CA, US
Chris Hawks - Saratoga CA, US
Thao Anh Nguyen - San Jose CA, US
Andrew LeFebvre - Campbell CA, US
Joerg Ferber - San Jose CA, US
Richard K. Oswald - San Jose CA, US
Brian Strom - Cupertino CA, US
Erhard Schreck - San Jose CA, US
Jingbo Yu - San Jose CA, US
Michael Mallary - Sterling MA, US
Scott Hughes - Cupertino CA, US
Duc Banh - San Jose CA, US
Kazuhiro Saito - San Jose CA, US
Donald J Brunnett - Plesanton CA, US
Tim Glassburn - Milpitas CA, US
Chris Hawks - Saratoga CA, US
Thao Anh Nguyen - San Jose CA, US
Andrew LeFebvre - Campbell CA, US
Joerg Ferber - San Jose CA, US
Richard K. Oswald - San Jose CA, US
Brian Strom - Cupertino CA, US
Assignee:
Maxtor Corporation - Longmont CO
International Classification:
G11B 21/02
US Classification:
360 75
Abstract:
A disk drive includes a drive housing, a storage disk, a slider and a drive circuitry. The slider magnetically interacts with the storage disk, and includes a read/write head that is positioned to have an actual head-to-disk spacing greater than zero nanometers during rotation of the storage disk. The drive circuitry can determine and/or monitor the actual head-to-disk spacing at any time during the operation of the disk drive based on an amplitude or a change in the amplitude of a signal such as a variable gain amplifier signal. In one embodiment, the slider includes a slider mover that receives current via the drive circuitry and causes a deformation of a portion of the slider to change the head-to-disk spacing based on the amplitude of the signal. In another embodiment, the read/write head moves during substantially consistent rotational velocity of the storage disk from a first actual head-to-disk spacing equal to approximately zero nanometers, to a second actual head-to-disk spacing that is greater than zero nanometers based on a desired amplitude of the signal.
Disk Drive That Positions A Head At Multiple Head-To-Disk Spacings
View pageUS Patent:
7324299, Jan 29, 2008
Filed:
Apr 7, 2005
Appl. No.:
11/101114
Inventors:
Erhard Schreck - San Jose CA, US
Donald J Brunnett - Pleasanton CA, US
Jingbo Yu - San Jose CA, US
Francis P. Crimi - San Jose CA, US
Scott Hughes - Cupertino CA, US
Duc Banh - San Jose CA, US
Anthony R. Hurtado - Cupertino CA, US
Kazuhiro Saito - San Jose CA, US
Andrew LeFebvre - Campbell CA, US
Chris Hawks - Saratoga CA, US
Thao Anh Nguyen - San Jose CA, US
Brian Strom - Cupertino CA, US
Bruce C. Schardt - Tracey CA, US
Donald J Brunnett - Pleasanton CA, US
Jingbo Yu - San Jose CA, US
Francis P. Crimi - San Jose CA, US
Scott Hughes - Cupertino CA, US
Duc Banh - San Jose CA, US
Anthony R. Hurtado - Cupertino CA, US
Kazuhiro Saito - San Jose CA, US
Andrew LeFebvre - Campbell CA, US
Chris Hawks - Saratoga CA, US
Thao Anh Nguyen - San Jose CA, US
Brian Strom - Cupertino CA, US
Bruce C. Schardt - Tracey CA, US
Assignee:
Maxtor Corporation - Longmont CO
International Classification:
G11B 21/02
G11B 5/596
G11B 5/58
G11B 5/596
G11B 5/58
US Classification:
360 75, 360 7804
Abstract:
A disk drive having a drive housing, a storage disk that is rotatably coupled to the drive housing, and a slider assembly that includes a head and a slider mover. The head reads data from the storage disk during a read operation and writes data to the storage disk during a write operation. The slider mover maintains the head at a read HtD spacing during the read operation, at a pre-write HtD spacing during the read operation prior to the write operation, at a write HtD spacing during the write operation, and at an idle HtD spacing when the drive is not performing the read operation or the write operation. The disk drive includes a drive circuitry that directs a read power level to the slider mover to maintain the head at the read HtD spacing, a pre-write power level to maintain the head at the pre-write HtD spacing, a write power level to maintain the head at the write HtD spacing, and a idle power level to maintains the head at the idle HtD spacing.
System For Detecting A Change In Head-To-Disk Contact Status In A Disk Drive
View pageUS Patent:
7362534, Apr 22, 2008
Filed:
Apr 7, 2005
Appl. No.:
11/101112
Inventors:
Erhard Schreck - San Jose CA, US
Francis P. Crimi - Los Altos CA, US
Jingbo Yu - San Jose CA, US
Michael Mallary - Sterling MA, US
Scott Hughes - Cupertino CA, US
Duc Bahn - San Jose CA, US
Mark Heimbaugh - Pleasanton CA, US
Kazuhiro Saito - San Jose CA, US
Andrew LeFebvre - Campbell CA, US
Joerg Ferber - San Jose CA, US
Xiaoping Hu - Milpitas CA, US
Douglas J. Krajnovich - Santa Clara CA, US
Chris Hawks - Saratoga CA, US
Donald J Brunnett - Pleasanton CA, US
Bruce C Schardt - Tracy CA, US
Francis P. Crimi - Los Altos CA, US
Jingbo Yu - San Jose CA, US
Michael Mallary - Sterling MA, US
Scott Hughes - Cupertino CA, US
Duc Bahn - San Jose CA, US
Mark Heimbaugh - Pleasanton CA, US
Kazuhiro Saito - San Jose CA, US
Andrew LeFebvre - Campbell CA, US
Joerg Ferber - San Jose CA, US
Xiaoping Hu - Milpitas CA, US
Douglas J. Krajnovich - Santa Clara CA, US
Chris Hawks - Saratoga CA, US
Donald J Brunnett - Pleasanton CA, US
Bruce C Schardt - Tracy CA, US
Assignee:
Maxtor Corporation - Longmont CO
International Classification:
G11B 21/02
G11B 5/596
G11B 5/58
G11B 5/596
G11B 5/58
US Classification:
360 75, 360 7804
Abstract:
A disk drive includes a rotatable storage disk, an actuator motor, a slider that magnetically interacts with the storage disk, and a drive circuitry. A portion of the slider moves between a first position wherein the slider does not contact the storage disk and a second position wherein the slider contacts the storage disk. The drive circuitry can detect when the position of the slider changes between these positions. In one embodiment, the drive circuitry monitors off-track movement of the slider to detect when the slider has moved between these positions. The drive circuitry can also current that is directed to the actuator motor that is used to compensate for off-track movement to detect when the slider moves between these positions. In yet another embodiment, the drive circuitry monitors a rotational velocity of the storage disk to detect approximately when the slider moves between these positions.
Monitoring Of Phenomena Indicative Of Ptp In A Magnetic Disk Drive
View pageUS Patent:
20040100255, May 27, 2004
Filed:
Feb 19, 2003
Appl. No.:
10/369179
Inventors:
Don Brunnett - Pleasanton CA, US
Duc Banh - San Jose CA, US
Jingbo Yu - San Jose CA, US
Mark Heimbaugh - Pleasanton CA, US
Suet Teo - San Jose CA, US
Erhard Schreck - San Jose CA, US
Duc Banh - San Jose CA, US
Jingbo Yu - San Jose CA, US
Mark Heimbaugh - Pleasanton CA, US
Suet Teo - San Jose CA, US
Erhard Schreck - San Jose CA, US
Assignee:
Maxtor Corporation
International Classification:
G01R033/12
US Classification:
324/210000, 324/228000
Abstract:
A PTP test subsystem of a magnetic disk drive identifies an undesired pole tip protrusion (PTP) condition, and takes steps to prevent problems associated with PTP. A PTP stressing mechanism stresses the disk drive during a PTP test mode to induce a PTP condition. A disk contact detection circuit detects when a head of the disk drive contacts the disk. A PTP write current determining circuit is also provided which comprises a write current level detector to ascertain a write current level at which the disk contact detection circuit detects when the head of the disk drive contacts the disk while the disk drive is stressed during the PTP test mode.
Closed Loop Fly Height Control
View pageUS Patent:
20070268615, Nov 22, 2007
Filed:
May 21, 2007
Appl. No.:
11/751135
Inventors:
James McFadyen - Redwood City CA, US
Kiem Nguyen - San Jose CA, US
Jingbo Yu - San Jose CA, US
Kiem Nguyen - San Jose CA, US
Jingbo Yu - San Jose CA, US
International Classification:
G11B 21/02
G11B 27/36
G11B 15/04
G11B 27/36
G11B 15/04
US Classification:
360 75, 360 60, 360 31
Abstract:
A distance between a head and a storage media is measured. An amount of power applied to a heater element in the head is adaptively adjusted based on a difference between the measured distance and a reference position indicating a desired distance between the head and the storage media. Related circuits and devices are also discussed.
Transducer Fly Height Distribution Range Reduction
View pageUS Patent:
20080030888, Feb 7, 2008
Filed:
May 22, 2007
Appl. No.:
11/751940
Inventors:
DON BRUNNETT - Pleasanton CA, US
Jingbo Yu - San Jose CA, US
Pang Tan - Fremont CA, US
Jingbo Yu - San Jose CA, US
Pang Tan - Fremont CA, US
Assignee:
Maxtor Corporate - Scotts Valley CA
International Classification:
G11B 21/21
US Classification:
360075000
Abstract:
Preferred embodiments of the present invention are generally directed to reducing variation in a distribution of transducer fly heights by selectively applying first and second fly height adjustment values to a plurality of transducers, the second fly height adjustment value being a multiple of the first fly height adjustment value.