1
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 (111 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 ...


2
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 (110 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 ...


3
Teddy T C Chen, Jinsheng Bill Jang, Jie Yu, Masao Miyamura: System and method for writing servo sectors in a perpendicular media recording environment. Western Digital Technologies, Blakely Sokoloff Taylor & Zafman, June 17, 2008: US07388728 (105 worldwide citation)

A perpendicular media recording (PMR) servo track writer (STW) system and method for writing servo sectors onto a disk is disclosed. The servo writer includes a head positioner to position a head of a head disk assembly (HDA) relative to a disk, wherein the head writes servo sectors onto the disk wi ...


4
Teddy T C Chen, Jinsheng Bill Jang, Jie Yu, Jonathan V Nguyen: Disk drive operable with first and second servo patterns in a perpendicular media recording environment. Western Digital Technologies, Blakely Sokoloff Taylor & Zafman, December 16, 2008: US07466509 (103 worldwide citation)

A disk drive operable with first and second servo patterns in a perpendicular media recording (PMR) environment is disclosed. The disk drive comprises a head operable with a perpendicular flux, a disk, and a servo controller. The disk includes a plurality of tracks, wherein each track has a pluralit ...