1
Guoxiao Guo Guoxiao Guo
Zhimin He, Guoxiao Guo, Hua Qian, EngHong Ong: Flexural pivot for rotary disc drive actuator. Seagate Technology, Derek J Berger, November 8, 2005: US06963472 (5 worldwide citation)

The present invention provides for a flexural pivot that can be fitted within a cavity of an actuator. The pivot includes a first member that can be coupled to the wall defining the cavity and a second member that can be mounted to the disc drive housing component of the disc drive. At least two lea ...


2
Andrew Bi Qiang
Qiang Bi, KianKeong Ooi, TaiVie Chiang, WingKong Chiang, Edmun ChianSong Seng, Jimmy Pang, BengWee Quak, UttHeng Kan, Xiong Liu, Ricardo SoonLian Lim, Patrick TaiHeng Wong, MingZhong Ding, WeiMing Yeow: Data storage medium with optimized servo format. Seagate Technology, McCarthy Law Group, July 29, 2008: US07405893 (26 worldwide citation)

A data storage medium and data storage system with improved efficiency of formatting are provided. One illustrative embodiment of the present invention pertains to a data storage medium. The data storage medium includes a first zone having servo information written with a first frequency, a second z ...


3
Andrew Bi Qiang
Xiong Liu, Qiang Bi, TzeMing Jimmy Pang, ChoonKiat Lim: System and method for reducing ZAP time and track squeeze in a data storage device. Seagate Technology, Fellers Snider et al, November 25, 2008: US07457075 (25 worldwide citation)

A method and apparatus for compensating for errors in servo systems. An improved zero acceleration path (ZAP) correction technique is provided, wherein selected tracks of a data storage device are used for ZAP processing in order to reduce the overall time required to perform error compensation for ...


4
Andrew Bi Qiang
Yong Y Yang, Qiang Bi, Xiong Liu, ChoonKiat Lim: Squeeze evaluations that account for low frequency components, in a controller usable in a data handling system. Seagate Technology, David K Lucente, Derek J Berger, March 1, 2005: US06862155 (22 worldwide citation)

Position error values are obtained from a transducer head while following a plurality of servo tracks with a servo loop that band-blocks a frequency range that includes F, a nominal rotation frequency. An estimated difference distribution is derived from the position error values, the difference dis ...


5
Andrew Bi Qiang
Tao Zhang, Kevin Arthur Gomez, Qiang Bi, MingZhong Ding, Stephen Kow Chiew Kuan: Real-time automatic loop-shaping for a disc drive servo control system. Seagate Technology, Westman Champlin & Kelly, May 30, 2006: US07054094 (15 worldwide citation)

An apparatus and method for improving servo loop performance in a disc drive storage system are provided. The servo loop includes a voice coil motor actuator that moves the head in response to a received servo control signal. A sensor, located in the head, senses servo information located on the dis ...


6
Andrew Bi Qiang
Kang Hai Lim, Chi Zhang, Bi Qiang, Yuheng Wang, Choon W Ng, Mingzhong Ding, KianKeong Ooi: Determining microactuator failure in a multi-stage tracking system. Seagate Technology, Hollingsworth Davis, June 18, 2013: US08467144 (11 worldwide citation)

A multi-stage tracking control system includes at least a main actuator and a microactuator. The tracking control system is switched to a single-stage mode so that the main actuator alone provides tracking. A disturbance signal is applied to the microactuator while in the single-stage mode, and a fa ...


7
Andrew Bi Qiang
Qiang Bi, KianKeong Ooi, TaiVie Chiang, WingKong Chiang, Edmun ChianSong Seng, Jimmy Pang, BengWee Quak, UttHeng Kan, Xiong Liu, Ricardo SoonLian Lim, Patrick TaiHeng, MingZhong Dong, WeiMing Yeow: Data storage medium having system data stored in a guard band between zones of consecutive data storage tracks. Seagate Technology, Mitchell K McCarthy, February 21, 2012: US08120868 (9 worldwide citation)

A storage medium format is provided having a first band of a plurality of consecutive data storage tracks having user data stored thereto, a second band of a plurality of consecutive data storage tracks having other user data stored thereto, and a guard track medially disposed therebetween the first ...


8
Andrew Bi Qiang
Xiong Liu, Bi Qiang, Kevin Arthur Gomez, Min Shuangquan: Method and disc drive for writing servo wedges. Seagate Technology, Fellers Snider et al, October 11, 2005: US06954325 (6 worldwide citation)

A method and disc drive are disclosed that write servo wedges to a plurality of tracks of a disc. A head having a read element offset from a write element reads a servo wedge on a first track as a propagation guide and writes two or more servo wedges to be used as a subsequent propagation guide on a ...


9
Andrew Bi Qiang
Qiang Bi, Xiong Liu, LeeLing Tan, Wen Jun Cao, ChoonKiat Lim: Soft sensor for operating shock in a disc drive. Seagate Technology, David K Lucente, Derek J Berger, March 25, 2008: US07349174 (4 worldwide citation)

A method of preventing a write operation to a disc in a disc drive during a shock event without the use of a separate shock sensor comprises steps of monitoring an actuator voice coil motor (VCM) control plant output signal, generating an actuator voice coil motor (VCM) plant model module output sig ...


10
Robert Deng
Robert H Deng, Yuan X Li, Eng H Koh: Correcting up to two disc drive read errors and detecting the occurrence of more than two read errors. Seagate Technology, Bill D McCarthy, Edward P Heller III, Randall K McCarthy, May 6, 1997: US05627843 (16 worldwide citation)

An apparatus and method for correcting up to two errors in a sequence of data elements read front a data track of a disc drive and detecting the occurrence of more than two errors. A syndrome generator determines a syndrome, having five components, from the data elements and the components are trans ...