1
Guoxiao Guo Guoxiao Guo
Jie Yu, Guoxiao Guo, Jack M Chue: Disk drive rewriting servo sectors by writing and servoing off of temporary servo data written in data sectors. Western Digital Technologies, Howard H Sheerin Esq, April 14, 2009: US07518819 (119 worldwide citation)

A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The disk drive further comprises a head actuated over the disk, the head comprising a read element radially offset from a write element ...


2
Guoxiao Guo Guoxiao Guo
Wai Ee Wong, Xiaotian Xu, Jinchuan Zheng, Guoxiao Guo, Jie Yu: Disk drive increasing bandwidth of cutoff filter while reading servo sector preamble. Western Digital Technologies, February 18, 2014: US08654467 (102 worldwide citation)

A disk drive is disclosed comprising a disk including a plurality of servo tracks defined by servo sectors, wherein each servo sector comprises a servo preamble. A head is actuated over the disk, wherein the head is operable to generate a read signal. The disk drive further comprises control circuit ...


3
Guoxiao Guo Guoxiao Guo
Stanley H Shepherd, Yakov M Lifschitz, Min Chen, Guoxiao Guo, Jason Laks: Data storage device writing multiple burst correction values at the same radial location. Western Digital Technologies, March 15, 2016: US09286925 (2 worldwide citation)

A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by servo bursts. The head is positioned at a first radial location over the disk and a first burst correction value is generated by reading at least one of the servo bursts. The h ...


4
Bo LIU
Bo Liu, Zhimin Yuan: Method and implementation of in-situ absolute head medium spacing measurement. Agency for Science Technology and Research, Martine Penilla & Gencarella, March 21, 2006: US07016131 (47 worldwide citation)

In a method based on readback signal for in-situ measuring of absolute head-medium spacing, a pre-encoded pattern in the magnetic medium on a disk has at least two harmonics with amplitudes such that a linear function of the logarithmic ratio of the spacing loss-term is formed in relation to testing ...


5
yuan xing Lee
Yuan Xing Lee, George Mathew, Shaohua Yang, Hongwei Song, Weijun Tan, Hao Zhong: Systems and methods for storage channel testing. LSI Corporation, Hamilton DeSanctis & Cha, August 2, 2011: US07990642 (23 worldwide citation)

Various embodiments of the present invention provide systems and methods for validating elements of storage devices. A an example, various embodiments of the present invention provide semiconductor devices that include a write path circuit, a read path circuit and a validation circuit. The write pat ...


6
yuan xing Lee
Weijun Tan, Hao Zhong, Yuan Xing Lee, Richard Rauschmayer, Shaohua Yang, Harley Burger, Kelly Fitzpatrick, Changyou Xu: Systems and methods for reducing attenuation of information derived from a defective medium. AGERE Systems, Hamilton DeSanctis & Cha, April 3, 2012: US08149527 (14 worldwide citation)

Various embodiments of the present invention provide systems and methods for data regeneration. For example, a method for data regeneration is disclosed that includes receiving a data input derived from a medium, determining a media defect corresponding to the data input, and determining an attenuat ...


7
Kees Schouhamer Immink
Kornelis A Schouhamer Immink, Ronaldus M Aarts: Dropout circuit arrangement for converting an information signal into a rectangular signal. U S Philips Corporation, Robert T Mayer, Algy Tamoshunas, February 12, 1985: US04499570 (13 worldwide citation)

For the conversion of a signal read from a record carrier into a rectangular signal, a threshold-value circuit is used, whose threshold value is determined by a reference signal. The reference signal is derived from a d.c. component in the converted signal. During a dropout in the signal being read, ...


8
yuan xing Lee
George Mathew, Yang Han, Shaohua Yang, Zongwang Li, Yuan Xing Lee: Frequency-based approach for detection and classification of hard-disc defect regions. LSI Corporation, Mendelsohn Drucker & Associates P C, Steve Mendelsohn, October 4, 2011: US08031420 (10 worldwide citation)

In a hard-disc drive read channel, frequency-based measures are generated at two different data frequencies (e.g., 2T and DC) by applying a transform, such as a discrete Fourier transform (DFT), to signal values, such as ADC or equalizer output values, corresponding to, e.g., a 2T data pattern store ...


9
yuan xing Lee
Shaohua Yang, George Mathew, Yang Han, Zongwang Li, Yuan Xing Lee: Amplitude-based approach for detection and classification of hard-disc defect regions. LSI Corporation, Mendelsohn Drucker & Associates P C, Steve Mendelsohn, October 25, 2011: US08045283 (3 worldwide citation)

In a hard-disc drive, a defect region on the hard disc is classified as corresponding to either thermal asperity (TA) or media defect (MD) by generating two statistical measures. A first measure (e.g., α1) is based on (i) the magnitudes of one or both of signal values (e.g., equalizer input or outpu ...


10
yuan xing Lee
Yuan Xing Lee: Read/write channel embedded on-chip optimization. Hitachi Global Storage Technologies Netherlands, Townsend and Townsend and Crew, Patrick Duncan, July 7, 2009: US07558012 (2 worldwide citation)

Embodiments of the present invention provide optimization of read/write channels in a recording system by embedding channel optimization algorithm/procedure into the channels, or a system-on-chip (SOC) where a read/write channel is integrated with a disk drive controller, according to an Embedded Ch ...