Hae Young Lee

6791780, Sep 14, 2004

Oct 15, 2001

09/978904

Hae Jung Lee - Santa Clara CA
Sang Lee - Pleasanton CA
Keung Youn Cho - San Jose CA
Ken Bovatsek - San Jose CA

Samsung Electronics Co., Inc.

G11B 503

360 66, 360 31, 360 53

The present invention is a method and system to optimize a write channel in a hard disk drive. The method comprises providing a disk having a at least one side with a plurality of tracks, and selecting a target track from the plurality of tracks. Data is written at least once on a predetermined plurality of tracks adjacent to either side of the target track and on the target track. Data is also written a predetermined number of times on tracks immediately adjacent to the target track. Data written on the predetermined plurality of tracks adjacent to either side of the target track and on the target track is then read. The process then determines if a number of errors on the tracks is greater than a predetermined criteria, if so, a write current value of the write channel is decreased, otherwise the write current value is increased.

6956710, Oct 18, 2005

Jun 9, 2003

10/458666

Jong Yun Yun - Cupertino CA, US
Hae Jung Lee - Santa Clara CA, US
Ken Bovatsek - San Jose CA, US
Kieu Lien Dang - Freemont CA, US

Samsung Electronics Co., Ltd. - Suwon

G11B005/09

360 53, 360 31, 360 75

A method for determining and varying the capacity, track per inch and bit per inch values of a hard disk drive. The method includes determining an optimal track per inch value for each head of the drive. The method then determines whether each head does not exceed a threshold BER value. If one or more heads do not exceed the threshold BER value then the BPI (data rates) of the non-performing heads are decreased until an acceptable BER is achieved. The BPI of performing heads may be increased to insure that the capacity of the disk drive still meets a target value. Likewise, if all of the heads are above the threshold value, the BPI of one or more of the performing heads may be decreased to improve the BER of the heads. The reduction in BPI is limited so that the drive always meets the target capacity value. The BPI and TPI values are stored in memory for use during the operation of the drive.

6975475, Dec 13, 2005

Nov 14, 2002

10/294115

Hae Jung Lee - Santa Clara CA, US
Sang Lee - Pleasonton CA, US
Keung Youn Cho - San Jose CA, US

Samsung Electronics Co., Ltd. - Suwon

G11B005/02

360 68, 360 46, 360 67

The invention includes a testing method which may be applied to at least one writer in a disk drive during the self-test phase to generate write parameters, focused on the Over Shoot Control (OSC) of the write current parameter to improve the reliability of write operations by that writer. The Minimum OSC is used for write operations in normal temperatures. The Optimum OSC is used for a first lower temperature range, preferably between essentially 15 Centigrade and essentially 5 Centigrade. The Maximum OSC is preferred below essentially 5 C. The Minimum OSC should preferably guarantee both an Adjacent Track Write (ATW) criteria, as well as guarantee a Write Induced Instability (WII) criteria. The invention includes the write parameter collection, as well as the disk drive containing the generated write parameter collection. The invention also includes the method of using that write parameter collection to control a writer while writing to tracks belonging to the radial zone collection and program systems implementing the invention's methods.

7035031, Apr 25, 2006

Nov 26, 2001

10/001846

Weonwoo Kim - Cupertino CA, US
Hae Jung Lee - Santa Clara CA, US
Sang Y. Lee - Pleasanton CA, US

Samsung Electronics Co., Ltd. - Suwon

G11B 19/02
G11B 33/14

360 69, 360 9702

A hard disk drive that includes a heater to heat an internal cavity of the drive. The disk drive may also have a temperature sensor to sense the temperature of the internal cavity, and a control circuit to control the heater and maintain the disk drive cavity, to be no less than a threshold temperature. The threshold temperature may correspond to a point where the heads of the drive undergo a significant degradation of performance. Maintaining the disk drive cavity temperature at or above the threshold temperature insures that the heads will not degrade due to temperature.

7089649, Aug 15, 2006

Sep 26, 2002

10/256553

Geng Wang - San Jose CA, US
Hae Jung Lee - Santa Clara CA, US
Keung Youn Cho - San Jose CA, US
Sang Lee - Pleasonton CA, US

Samsung Electronics Co. Ltd, - Suwon

G11B 5/127
H04R 31/00

2960309, 2960303, 2960304, 2960305, 2960307, 360 31, 360 9701, 3602345, 360244, 360245, 3602944

Thermal pole tip protrusion is caused by materials in and around head slider expanding during write operations till they protrude, leading to contact with the rotating disk surface, altering the flying height and often wearing down part of the disk surface. While well known that read-write heads expand during writing, the inventors who recognized this situation's significance, particularly as flying height decreases and data rates increase, both required for high areal density disk drives. The inventors realized that they could detect the problem at the spin stand level by testing head gimbal assemblies to reliably, and inexpensively, predict the tendency for thermal pole tip protrusion. This leads to selection of head gimbal assemblies, which do not have the thermal pole tip protrusion tendency. The selected head gimbal assemblies have better reliability, as do actuators and disk drives made with the selected head gimbal assemblies.

7253978, Aug 7, 2007

Jul 6, 2005

11/176414

Hae Jung Lee - Santa Clara CA, US
Sang Lee - Pleasonton CA, US
Keung Youn Cho - San Jose CA, US

Samsung Electronics Co., Ltd. - Suwon, Kyungki-Do

G11B 27/36

360 31, 360 46, 360 51, 360 55, 360 66, 360 68

The invention includes a testing method which may be applied to at least one writer in a disk drive during the self-test phase to generate write parameters, focused on the Over Shoot Control (OSC) of the write current parameter to improve the reliability of write operations by that writer. The Minimum OSC is used for write operations in normal temperatures. The Optimum OSC is used for a first lower temperature range, preferably between essentially 15 degrees Centigrade and essentially 5 degrees Centigrade. The Maximum OSC is preferred below essentially 5 degrees Centigrade. The Minimum OSC should preferably guarantee both an Adjacent Track Write (ATW) criteria, as well as guarantee a Write Induced Instability (WII) criteria. The invention includes the write parameter collection, as well as the disk drive containing the generated write parameter collection. The invention also includes the method of using that write parameter collection to control a writer while writing to tracks belonging to the radial zone collection and program systems implementing the invention's methods.

7592711, Sep 22, 2009

Dec 19, 2007

11/959495

Hae Sook Lee - Cupertino CA, US

F03D 9/00

290 44, 290 55

A self-propelled wind power regenerator powered by the natural wind, by a propeller or a combination of both, depending on the condition of the wind and the demand of the electricity. During the period when the natural wind flows constantly above the cut-in wind speed, the wind turbine may be powered by the natural wind. When the useable natural wind becomes unavailable, the propeller is activated by a sensor that detects the drop of the output of the wind turbines. The propeller thus keeps the wind turbines running at the level of rated wind speed, and maintains the quality of the wind power regardless of the natural wind condition.

20030043489, Mar 6, 2003

Aug 31, 2001

09/945452

Hae Lee - Santa Clara CA, US
Sang Lee - Pleasanton CA, US
Keung Cho - San Jose CA, US

G11B005/09
G11B027/36

360/053000, 360/031000

A method and system to optimize the performance of a read/write head in a hard disk drive. The method comprises providing a disk having at least one side with a plurality of tracks, selecting a current value, and applying the current value to the read/write head. The performance of the read/write head is then measured and the method determines if the current value has been applied to the read/write head a predetermined number of times. If not, the current value is applied to the read/write head a predetermined number of times. The best performance value of the read/write head and a corresponding current value are then stored.