LIN GUO, O.D., PH.D.
Optometry at Barber Ln, Milpitas, CA

6445545, Sep 3, 2002

Mar 21, 2000

09/532057

Lin Guo - Milpitas CA
Dennis Chen - Milpitas CA
Matthew OHara - Oakland CA

Maxtor Corporation - Longmont CO

G11B 2116

3602451

A slider support structure is disclosed for minimizing off-rack due to disk flutter. In one embodiment, the slider support structure includes a gimbal assembly ( ). The assembly ( ) includes an outer ring ( ) and an inner ring ( ). The outer ring ( ) is connected to the inner ring ( ) via narrow strips ( and ) adjacent to the front ( ) and back ( ) surfaces of the slider body ( ). The inner ring ( ) is attached to the left ( ) and right ( ) surfaces of the slider body ( ) via narrow strips ( and ). The strips ( and ) interconnecting the inner ring ( ) and outer ring ( ) define a flexible hinge that allows the slider body ( ) to pivot relative to the assembly ( ) about an axis ( ) which, in this case, is the roll axis. Similarly, the strips ( and ) define a flexible hinge which allows the slider to pivot relative to the assembly ( ) about another axis ( ) which, in this case, is the pitch axis. The axes ( and ) are disposed close to the lower surface of the slider so that head off-track associated with such pivotal is minimized.

6687091, Feb 3, 2004

Jan 13, 2003

10/341929

Lin Guo - Milpitas CA

Maxtor Corporation - Longmont CO

G11B 2116

3602448

A suspension load beam for an actuator assembly of a disk drive includes a bend radius portion with a spring rate that is less than 18 Newtons per meter, a first bending mode that is greater than 3,500 Hertz, and a first torsion mode that is greater than 5,300 Hertz. The method of making this suspension load beam includes cutting a sheet of material to form a flat suspension load beam including a bend radius portion, removing material in the bend radius portion from full thickness, inspecting the bend radius portion to determine its thickness, and removing material from the bend radius portion and/or from the main body of the suspension load beam to compromise the performance difference due to thickness variation in bend radius portion.

6493176, Dec 10, 2002

Apr 24, 2000

09/556709

Youping Deng - Sunnyvale CA
Lin Guo - Milpitas CA

Maxtor Corporation - Longmont CO

G11B 5596

360 7805, 360 7808, 360 48

The present invention is directed to utilizing the capabilities of multi-stage actuators in disk drives to write servo tracks that have a variable number of tracks-per-inch (TPI) from head to head, thereby improving both the performance of the drive and manufacturing yields. An appropriate TPI for a particular head has been found to depend on a number of factors that vary from head to head. Consequently, the initial step is to determine an appropriate TPI for at least one of the heads or, more preferably, all of the heads in the drive. The determination typically involves measurements such as read and write width measurements and off-track performance tests for the relevant heads. Once an appropriate TPI format has been determined, the servo tracks are written according to the TPI formats using either a servo track writer or self servo track writing.

7355808, Apr 8, 2008

May 23, 2006

11/439731

David M. Tung - Livermore CA, US
Lin Guo - Milpitas CA, US
Don Brunnett - Pleasanton CA, US

Maxtor Corporation - Scotts Valley CA

G11B 21/02

360 75

A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information is grouped into a x set of servo information and a x set of servo information. The disk drive's read head is used to read the x set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the x set of servo information. Then, the disk drive's read head is used to read the x set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the x set of servo information. The process is repeated on a track-by-track basis until servo information is written from the outer diameter of the disk surface to the inner diameter of the disk surface, as if it was entirely written by a servo track writer.

6975482, Dec 13, 2005

Mar 5, 2004

10/794579

Lin Guo - Milpitas CA, US
Xiaoping Hu - San Jose CA, US

Maxtor Corporation - Longmont CO

G11B005/55

360 7805

An actuator control system and method for a hard disk drive comprising first and second actuators that support a head relative to a disk is disclosed. The actuator control system comprises a first stage, a second stage, a memory device, and a maximum stroke calculator. The first stage displaces the first actuator relative to the disk. The second stage displaces the second actuator relative to the first actuator. The memory device stores at least one data value indicative of a predicted response of the second stage. The maximum stroke calculator generates a predicted maximum stroke based on the at least one data value stored by the memory device. The second stage is deactivated when the disk drive initiates a seek operation. The second stage is reactivated based on a comparison of the predicted maximum stroke with a position of the second actuator.

7050260, May 23, 2006

Nov 12, 2002

10/293904

David M. Tung - Livermore CA, US
Lin Guo - Milpitas CA, US
Don Brunnett - Pleasanton CA, US

Maxtor Corporation - Longmont CO

G11B 21/02

360 75

A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information is grouped into a 1× set of servo information and a 2× set of servo information. The disk drive's read head is used to read the 1× set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the 2× set of servo information. Then, the disk drive's read head is used to read the 2× set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the 1× set of servo information. The process is repeated on a track-by-track basis until servo information is written from the outer diameter of the disk surface to the inner diameter of the disk surface, as if it was entirely written by a servo track writer.

7158325, Jan 2, 2007

Nov 8, 2004

10/984559

Xiaoping Hu - San Jose CA, US
Yu Sun - Fremont CA, US
Lin Guo - Milpitas CA, US
Don Brunnett - Pleasanton CA, US

Maxtor Corporation - Scotts Valley CA

G11B 15/18

360 69

A disk drive detects head touchdown based on a magnitude of a position error signal at a discrete frequency. The discrete frequency is one-half the disk rotation frequency or an integral multiple of the disk rotation frequency. The head is heated by turning on a heater at the discrete frequency, thereby injecting bias into a servo system that increases the PES magnitude. In addition, the servo system has a first transfer function for tracking the head during read and write operations and a second transfer function for tracking the head during head touchdown detection. The second transfer function has smaller vibration rejection than the first transfer function so that the disk drive is less sensitive to vibration during read and write operations than during head touchdown detection.

7154689, Dec 26, 2006

Sep 20, 2004

10/945371

Stanley H. Shepherd - Morgan Hill CA, US
Yu Sun - Fremont CA, US
Lin Guo - Milpitas CA, US
John VanLaanen - Longmont CO, US

Maxtor Corporation - Longmont CO

G11B 5/09

360 48, 360 75, 360 7708

Methods for making a disk drive, apparatus for writing servo bursts on a disk, and disk drive apparatus are provided. The disk drive includes a disk and transducer adjacent to the disk. The transducer includes a read element and a write element. A width of the read element is determined. A servo track pitch is determined based on the read element width. Servo bursts are written in servo tracks on the disk with the write element based on the servo track pitch.

7035041, Apr 25, 2006

Feb 12, 2003

10/366544

Lin Guo - Milpitas CA, US
Xiaoping Hu - San Jose CA, US
Wei Guo - Fremont CA, US

Maxtor Corporation - Longmont CO

G11B 5/596

360 7805

A control system and method for a disk drive comprising first and second actuator arms. The control system comprises first and second stages and a reset system. The first stage displaces the first arm. The second stage displaces the second arm relative to the first arm. The second stage defines a displacement offset when the disk drive begins a seek operation. The reset system discharges at least a portion of the displacement offset over time.

7253987, Aug 7, 2007

Jul 10, 2003

10/617479

David Hyunchul Shim - Milpitas CA, US
Jong-Min Lin - Cupertino CA, US
Lin Guo - Milpitas CA, US

Maxtor Corporation - Longmont CO

G11B 5/596

360 7702

A servo system includes a first member and a second member that is positionable relative to the first member. A position error signal causes the second member to be positioned at a desired location relative to the first member. The position error signal includes a position error due to a disturbance in the servo system, and the position error is reduced by attenuation of a disturbance signal as a non-linear function of the amplitude of the disturbance signal.