Gang H Lin

US Patent:

6452735, Sep 17, 2002

Filed:

Jul 19, 1999

Appl. No.:

09/357094

Inventors:

Curtis Egan - Thornton CO
Gang Herbert Lin - San Jose CA

Assignee:

Maxtor Corporation - Longmont CO

International Classification:

G11B 2736

US Classification:

360 31, 360 25, 360 75, 360 53, 360 60

Abstract:

A disk drive that monitors changes in flying height is disclosed. In one embodiment, the disk drive includes a disk for storing information and an air bearing slider with a transducer that includes a write element for writing information to the disk during a write operation and a magneto-resistive (MR) read element for reading information from the disk during a read operation. The MR read element generates a readback signal during the write operation that includes a thermally induced signal caused by thermal changes in the MR read element and a magnetically induced signal caused by magnetic flux applied by the write element to the MR read element. The thermally induced signal has a relatively low frequency content and the magnetically induced signal has a relatively high frequency content. The disk drive also includes a low pass filter for receiving the readback signal and isolating the thermally induced signal from the magnetically induced signal, a threshold detector for receiving the thermally induced signal from the filter and generating a high fly write detection signal when the thermally induced signal exceeds a threshold value, and a controller for modifying the write operation in response to the high fly write detection signal.

US Patent:

6808783, Oct 26, 2004

Filed:

Jan 17, 2002

Appl. No.:

10/052621

Inventors:

Gang Herbert Lin - San Jose CA
Thao Nguyen - San Jose CA

Assignee:

Maxtor Corporation - Longmont CO

International Classification:

G11B 566

US Classification:

428 653, 428 657, 428156, 428212, 428215, 428336, 428409, 428694 T, 428694 TS, 428694 TM, 428694 B, 428694 BS, 428694 BM

Abstract:

The present invention is directed to a writable or recordable disk that has radially varying recording properties. In one configuration, the magnetic moment, magnetic remanence, and/or information layer thickness decreases from the disk inner diameter to the disk outer diameter. In one configuration, the writing property or coercivity of the disk decreases from the disk inner diameter to the disk outer diameter. The variation in writing property may be accomplished by varying the thickness of an underlayer to the information layer.

US Patent:

7092193, Aug 15, 2006

Filed:

Aug 2, 2002

Appl. No.:

10/211671

Inventors:

Robert McKenzie - Longmont CO, US
Thao Nguyen - San Jose CA, US
Xiaokun Chew - San Jose CA, US
Gang Herbert Lin - San Jose CA, US
Jack Tsai - Milpitas CA, US
Bruce Schardt - Tracy CA, US
Steven Marshall - Northboro MA, US

Assignee:

Maxtor Corporation - Longmont CO

International Classification:

G11B 21/02

US Classification:

360 75

Abstract:

A disk drive includes a slider assembly and a controller that directs current to the slider assembly to dynamically adjust the head-to-disk spacing. In one embodiment, the slider assembly includes a write element having a first end, a second end and an intermediate section, a conductor that is connected to the intermediate section. In this embodiment, the controller directs electrical current through the conductor to heat the write element without writing data to a storage disk. The electrical current can be directed through the conductor at any time prior to data transfer or during data transfer. Heating the write element causes a deformation of the slider assembly to decrease the head-to-disk spacing. In another embodiment, the slider assembly includes a separate slider deformer. Electrical current is selectively directed to the slider deformer to cause a deformation of the slider assembly to obtain a desired head-to-disk spacing.

US 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

Assignee:

Maxtor Corporation - Longmont CO

International Classification:

G11B 27/36
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.

US Patent:

7388726, Jun 17, 2008

Filed:

Aug 10, 2006

Appl. No.:

11/503354

Inventors:

Robert McKenzie - Longmont CO, US
Thao Nguyen - San Jose CA, US
Xiaokun Chew - San Jose CA, US
Gang Herbert Lin - San Jose CA, US
Jack Tsai - Milpitas CA, US
Bruce Schardt - Tracy CA, US
Steven Marshall - Northboro MA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 21/02

US Classification:

360 75, 360 7807

Abstract:

A disk drive includes a slider assembly and a controller that directs current to the slider assembly to dynamically adjust the head-to-disk spacing. In one embodiment, the slider assembly includes a write element having a first end, a second end and an intermediate section, a conductor that is connected to the intermediate section. In this embodiment, the controller directs electrical current through the conductor to heat the write element without writing data to a storage disk. The electrical current can be directed through the conductor at any time prior to data transfer or during data transfer. Heating the write element causes a deformation of the slider assembly to decrease the head-to-disk spacing. In another embodiment, the slider assembly includes a separate slider deformer. Electrical current is selectively directed to the slider deformer to cause a deformation of the slider assembly to obtain a desired head-to-disk spacing.

US Patent:

7532434, May 12, 2009

Filed:

Sep 6, 2002

Appl. No.:

10/237252

Inventors:

Erhard T. Schreck - San Jose CA, US
Gang Herbert Lin - San Jose CA, US

International Classification:

G11B 5/127

US Classification:

3601253

Abstract:

A disk drive having a head with a recessed write pole for perpendicular recording to a disk. The head also includes a read element, a first shield and a second shield that share a common plane, and the write pole is recessed relative to the plane, thereby reducing pole tip protrusion.

US Patent:

7692895, Apr 6, 2010

Filed:

Apr 10, 2006

Appl. No.:

11/401208

Inventors:

Yan Wu - Cupertino CA, US
Gang Herbert Lin - San Jose CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5/147

US Classification:

36012508

Abstract:

A magnetic head for perpendicular recording includes a main pole having a first end and a second end. Coils are positioned with respect to the main pole. A return pole forms first and second return paths for magnetic flux extending from the second end of the main pole. The main pole includes an anti-ferromagnetic layer to pin a remnant magnetic moment in the horizontal direction.

US Patent:

7705588, Apr 27, 2010

Filed:

Oct 5, 2005

Appl. No.:

11/245250

Inventors:

Robert Eaton - San Jose CA, US
Gang Herbert Lin - San Jose CA, US
Tao Lin - Santa Clara CA, US
Amir Ali Companieh - San Francisco CA, US
Rob Milby - Santa Cruz CA, US
Ron Carroll - San Jose CA, US
Robert Kimball - San Jose CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G01R 33/12

US Classification:

324210, 324262

Abstract:

An apparatus and method for testing a component of a magnetic disk drive in which one or more drive-based components is used in the testing process. Each of the drive-based components is based on a corresponding one of the components of the magnetic disk drive. During testing, the component to be tested and at least one of the drive-based components are selectively engaged.