1
Guoxiao Guo Guoxiao Guo
Guoxiao Guo, Jie Yu, Abhishek Dhanda: Disk drive correcting high order gray code using track estimator and decoding low order track code separately. Western Digital Technologies, April 8, 2014: US08693123 (125 worldwide citation)

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks defined by a plurality of servo sectors. An estimated track ID is generated representing an estimated radial location of the head. A high order Gray code in a first servo sector is detected, and errors ...


2
Guoxiao Guo Guoxiao Guo
Guoxiao Guo, Abhishek Dhanda, Jie Yu: Disk drive excluding servo sub-bursts when computing position error signal. Western Digital Technologies, March 1, 2011: US07898762 (119 worldwide citation)

A disk drive is disclosed comprising a head actuated over a disk, the disk including a plurality of servo sectors wherein each servo sector comprises at least one servo burst. A read signal emanating from the head is sampled while reading a servo burst in a servo sector to generate a plurality of sa ...


3
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 (118 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 ...


4
Guoxiao Guo Guoxiao Guo
Jie Yu, Guoxiao Guo: System and method for identifying track squeeze errors (TSEs) of a disk of a disk drive. Western Digital Technologies, Blakely Sokoloff Taylor & Zafman, February 16, 2010: US07663835 (114 worldwide citation)

A system and method for efficiently identifying track squeeze errors (TSEs) of a disk of a disk drive during a testing process for the disk drive is disclosed. The method includes reading servo bursts from a track of the disk, utilizing a modeled scan variable, and determining a gain comprising a ra ...


5
Guoxiao Guo Guoxiao Guo
Jie Yu, Guoxiao Guo: Servo track squeeze compensation in a disk drive. Western Digital Technologies, Blakely Sokoloff Taylor & Zafman, December 29, 2009: US07639447 (111 worldwide citation)

A disk drive that compensates for written-in track squeeze errors (TSEs) during track following is disclosed. The disk drive may be used to compensate for TSEs when determining the position error signal (PES) by implementing operations that include: determining a track squeeze value for a servo sect ...


6
Guoxiao Guo Guoxiao Guo
Guoxiao Guo, Jie Yu: Zoned servo system. Western Digital Technologies, July 3, 2012: US08213106 (111 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 ...


7
Guoxiao Guo Guoxiao Guo
Teddy T C Chen, Eugene Chun Tsing Wu, John Yin Kwong Li, Jie Yu, Jonathan V Nguyen, Tuong M Vu, Guoxiao Guo: Disk drive writing wedge RRO values in a butterfly pattern. Western Digital Technologies, Howard H Sheerin Esq, August 18, 2009: US07576941 (110 worldwide citation)

A disk drive is disclosed comprising a plurality of servo sectors that define a plurality of tracks, and a head comprising a read element radially offset from a write element. The read element is positioned over a first track, and the first track is read to generate first read wedge repeatable runou ...


8
Guoxiao Guo Guoxiao Guo
Teddy T C Chen, Guoxiao Guo, Kuang Yang Tu: Disk drive writing wedge RRO data along a sinusoidal path to compensate for reader/writer offset. Western Digital Technologies, Howard H Sheerin Esq, September 1, 2009: US07583470 (109 worldwide citation)

A disk drive is disclosed including a disk having a plurality of tracks, wherein each track comprises a plurality of servo sectors. The disk drive further comprises a head having a read element offset from a write element by a reader/writer offset. The read element is positioned over a first track a ...


9
Guoxiao Guo Guoxiao Guo
Honge Wang, Michael Chang, Abhishek Dhanda, Huanxiang Ruan, Guoxiao Guo: Disk drive estimating reader/writer gap across servo zones. Western Digital Technologies, November 5, 2013: US08576506 (106 worldwide citation)

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones. A disk locked clock is synchronized relative to a servo data rate of the servo zone the head is over. A fir ...


10
Guoxiao Guo Guoxiao Guo
Guoxiao Guo, Jie Yu: Disk drive comprising slanted line servo burst sets offset radially. Western Digital Technologies, June 29, 2010: US07746594 (106 worldwide citation)

A disk drive is disclosed comprising a disk having servo data defining a plurality of servo tracks. The servo data comprises a preamble, and a plurality of slanted line servo bursts recorded at a tilt angle with respect to the preamble. The slanted line servo bursts comprises a first plurality of sl ...