1
Guoxiao Guo Guoxiao Guo
Guoxiao Guo, Jie Yu: Zoned servo system. Western Digital Technologies, July 3, 2012: US08213106 (112 worldwide citation)

A disk drive includes a plurality of servo zones of different servo frequencies and a read channel. The disk drive also includes a frequency detector operable to determine a servo frequency associated with a servo sector. The read channel includes a voltage-controlled oscillator operable to provide ...


2
Guoxiao Guo Guoxiao Guo
Jianguo Zhou, Guoxiao Guo, Donald Brunnett, Min Chen, Wei Guo, Jie Yu: Disk drive using timing loop control signal for vibration compensation in servo loop. Western Digital Technologies, September 22, 2015: US09142249

A disk drive is disclosed comprising a timing loop configured to generate a clock synchronized to a rotation of a disk and a servo loop configured to control an actuator to actuate a head over the disk. A timing signal generated by the timing loop is filtered with a pre-compensation filter (PCF) com ...


3
yuan xing Lee
George Mathew, Yuan Xing Lee, Hongwei Song: Systems and methods for adaptive write pre-compensation. LSI Corporation, Hamilton DeSanctis & Cha, April 12, 2011: US07924518 (18 worldwide citation)

Various embodiments of the present invention provide systems and methods for write pre-compensation. For example, various embodiments of the present invention provide methods for modifying magnetic information transfer. The methods include retrieving magnetically represented data from a storage medi ...


4
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 ...


5
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 ...


6
yuan xing Lee
George Mathew, Yuan Xing Lee, Hongwei Song: Systems and methods for on-the-fly write pre-compensation estimation. Agere Systems, Hamilton DeSanctis & Cha, December 28, 2010: US07859780 (4 worldwide citation)

Various embodiments of the present invention provide systems and methods for write pre-compensation. For example, various embodiments of the present invention provide systems for on-the-fly estimation of write pre-compensation values. Such systems include a magnetic storage medium, a read/write head ...


7
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 ...


8
Charles J Yarbrough, Alan F Strachan, Jo Weisman: Method and apparatus for selectively recording a broadcast. Codart, Townsend and Townsend, December 8, 1981: US04305101 (267 worldwide citation)

A selective receiving and/or recording technique for broadcast audio and/or video programs where the broadcast signal has a tone code preceding each program segment to which a monitoring-receiving-recording device is responsive, either matching the tone code with a prestored list of orders for recei ...


9
Michael S Rothberg: Disk drive employing data averaging techniques during retry operations to facilitate data recovery. Western Digital Technologies, Howard H Sheerin Esq, November 14, 2006: US07136244 (210 worldwide citation)

The present invention may be regarded as a disk drive comprising a disk having a plurality tracks, each track comprising a plurality of data sectors. If an error occurs while attempting to read one of the data sectors, a retry operation is executed in an attempt to recover the errant data sector. Av ...


10
Kumiko Fukui, Tatsuaki Doumura, Shigeo Okamoto: Record mode setting apparatus responsive to transmitted code containing time-start information. Sanyo Electric, Armstrong Nikaido Marmelstein & Kubovcik, November 7, 1989: US04879611 (197 worldwide citation)

The record mode setting apparatus comprises a VPS setting switch (41), a VPS decoder (3), a code latch circuit (7), a VPS control circuit (26) and a code memory (27). When the VPS setting switch (41) is turned on while a recording means (16) is ready for recording, the VPS decoder (3) detects a VPS ...