1
Xiaodong Che, Wen Chien David Hsiao, Yansheng Luo, Xiaoyu Sui, Samuel Wei san Yuan: Method and apparatus for optimizing record quality with varying track and linear density by allowing overlapping data tracks. Hitachi Global Storage Technologies Netherlands, November 7, 2006: US07133241 (18 worldwide citation)

A method and apparatus for optimizing data record quality on a disk for a pair of read and write heads, in which the write head is bigger, by adaptively varying linear and track density of overlapping recorded tracks to achieve a target storage capacity. In the method, target storage capacity and ra ...


2
Alexander Gyure, Jindrich Zejda, Peivand Fallah Tehrani, Wenyuan Wang, Chi Chong Lo, Mahmoud Shahram, Yansheng Luo, William Chiu Ting Shu, Seyed Alireza Kasnavi: Method and apparatus for characterizing the propagation of noise through a cell in an integrated circuit. Synopsys, Park Vaughan & Fleming, February 28, 2006: US07007252 (6 worldwide citation)

One embodiment of the invention provides a system that characterizes cells within an integrated circuit. During operation, the system obtains a number of input noise signals to be applied to the cell. The system then simulates responses of the cell to each of the input noise signals, and stores a re ...


3
Shanlin Duan, Jizhong He, John Stephen Hopkins, Yansheng Luo: System, method and apparatus for direct head-disk clearance measurement by slider vibration and fly height calibration. Hitachi Global Storage Technologies Netherlands, May 25, 2010: US07724462 (5 worldwide citation)

A method models and calibrates the fly height of a slider above the disk for disk drives. The calibration scheme uses the Wallace spacing loss equation and laser doppler velocimetry to predict fly height and detect the actual fly height of the slider. The slider is vibrated at selected resonances, s ...


4
Xiaodong Che, Wenchien David Hsiao, Yansheng Luo, Xiaoyu Sui: Magnetic reader recording characterization at slider or bar level. Hitachi Global Storage Technologies Netherlands, Duke Amaniampong, April 29, 2008: US07365531 (3 worldwide citation)

An apparatus for reader characterization is described. The apparatus includes a rotator for rotating a media. The media can contain a signal having a value for a function of a read/write head being assessed. The rotator is operable in conjunction with said apparatus. The apparatus also includes a pr ...


5
Savas Gider, Wen Chien David Hsiao, Quan chiu Harry Lam, Terence Tin Lok Lam, Edward Hin Pong Lee, Yansheng Luo, Vladimir Nikitin, Changqing Shi, Xiaoyu Sui: Method and apparatus for providing a write head with an improved pole tip to improve overwrite and/or adjacent track interference. Hitachi Global Storage Technologies Netherlands, Merchant & Gould, December 11, 2012: US08331058 (2 worldwide citation)

A method and apparatus for providing a write head with an improved pole tip to improve overwrite and/or adjacent track interference. A cross pole tip writer is provided with a shape that is designed to reduce the saturation on the pole tip and aid in the concentration of flux to the down track.


6
Alexander Gyure, Jindrich Zejda, Peivand Fallah Tehrani, Wenyuan Wang, Chi Chong Lo, Seyed Alireza Kasnavi, Mahmoud Shahram, Yansheng Luo, William Chiu Ting Shu: Method and apparatus for detecting and analyzing the propagation of noise through an integrated circuit. Synopsys, Park Vaughan & Fleming, August 28, 2007: US07263676 (2 worldwide citation)

One embodiment of the invention provides a system that analyzes the propagation of noise through an integrated circuit. During operation, the system obtains an input noise signal to be applied to a cell within the integrated circuit. The system then looks up parameters specifying how noise affects t ...


7
Wen Chien David Hsiao, Yimin Hsu, Quan chiu Harry Lam, Yansheng Luo, Vladimir Nikitin, Changqing Shi: Perpendicular magnetic write head with stepped write pole for reduced MCW dependency on skew angle. Hitachi Global Storage Technologies Netherlands, Zilka Kotab PC, August 2, 2011: US07990652 (2 worldwide citation)

A magnetic write head for perpendicular magnetic data recording having a notched write pole for reduced magnetic core width (MCW) dependence on skew. The write pole is configured with a notch that can extend to or slightly beyond the flare point of the write pole, and is formed on the leading portio ...


8
Zhihao Li, Xiaodong Che, Zhen Jin, Yansheng Luo: Perpendicular magnetic write head having a trailing wrap-around magnetic shield magnetically biased in a cross track direction. HGST Netherlands, Zilka Kotab PC, September 17, 2013: US08537496 (1 worldwide citation)

A perpendicular magnetic write head having improved Bit Error Rate (BER), Adjacent Track Interference (ATI) and Far Track Interference (FTI). The write head includes a write pole and a trailing wrap-around magnetic shield. A permanent magnetic is located at either outer side of the shield. These mag ...


9
Wen Chien David Hsiao, Yansheng Luo, Quan chiu Harry Lam: Perpendicular magnetic write head having a novel trailing return pole for reduced wide-area-track-erasure. Hitachi Global Storage Technologies Netherlands, Zilka Kotab PC, November 29, 2011: US08068311 (1 worldwide citation)

A magnetic write head having a magnetic return pole that is configured to prevent wide area track erasure. The magnetic return pole has a throat region with a relatively narrow width and has a inner and outer wing portions formed near the air bearing surface. The inner wing portion has a front edge ...


10
Wen Chien D Hsiao, Hin P E Lee, Jyh Shuey Lo, Yansheng Luo, Samuel W Yuan: Magnetic head with magnetic layers of differing widths and third pole with reduced thickness. Hitachi Global Storage Technologies Netherlands, Zilka Kotab PC, August 15, 2006: US07092206

A magnetic head includes a magnetic write structure having a first magnetic layer having a first pole, a second magnetic layer having a second pole spaced apart from the first pole, and a third magnetic layer having a third pole contacting the second pole. The third pole has a third-pole width great ...