Patents by Inventor Siang Huei Leong
Siang Huei Leong has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9672862Abstract: According to embodiments of the present invention, a method of writing servo information on a storage medium is provided. The method includes applying heat to a servo portion of a storage medium, and applying a magnetic field to the servo portion that is heated to write servo information on the servo portion. According to further embodiments of the present invention, an arrangement for writing servo information on a storage medium and a method of forming a storage medium are also provided.Type: GrantFiled: September 17, 2014Date of Patent: June 6, 2017Assignee: Marvell International Ltd.Inventors: Wen Huei Jack Tsai, Siang Huei Leong, Baoxi Xu
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Patent number: 9626998Abstract: A hard disk drive device and a method and apparatus for control of the hard disk drive is provided. The hard disk drive includes disk media, a slider head, a head gimbal assembly and a control means. The disk media includes at least two layers for data storage. The slider head flies above the disk media and includes a writer and a reader, and a head gimbal assembly supports the slider head above the disk media. The control means is physically coupled to the head gimbal assembly and electrically coupled to the writer and the reader for reducing write interference from the writer when the writer is writing to the disk media while the reader is reading from the disk media, wherein write interference is reduced in one or more of a time domain and a frequency domain.Type: GrantFiled: July 30, 2014Date of Patent: April 18, 2017Assignee: Marvell International Ltd.Inventors: Jingliang Zhang, Zhimin Yuan, Siang Huei Leong, Budi Santoso, Pantelis Sophoclis Alexopoulos
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Patent number: 9626992Abstract: In various embodiments, a read assembly for reading a dual-layered medium may be provided. The dual-layered medium may include a servo layer and a data layer over the servo layer. The read assembly may include a data read head configured to read the data layer. The read assembly may also include a servo read head configured to read the servo layer.Type: GrantFiled: June 25, 2014Date of Patent: April 18, 2017Assignee: Marvell International Ltd.Inventors: Yunjie Chen, Siang Huei Leong, Bo Liu
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Publication number: 20160232935Abstract: According to embodiments of the present invention, a method of writing servo information on a storage medium is provided. The method includes applying heat to a servo portion of a storage medium, and applying a magnetic field to the servo portion that is heated to write servo information on the servo portion. According to further embodiments of the present invention, an arrangement for writing servo information on a storage medium and a method of forming a storage medium are also provided.Type: ApplicationFiled: September 17, 2014Publication date: August 11, 2016Applicant: Marvell International Ltd.Inventors: Wen Huei Jack TSAI, Siang Huei LEONG, Baoxi XU
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Publication number: 20160163351Abstract: A hard disk drive device and a method and apparatus for control of the hard disk drive is provided. The hard disk drive includes disk media, a slider head, a head gimbal assembly and a control means. The disk media includes at least two layers for data storage. The slider head flies above the disk media and includes a writer and a reader, and a head gimbal assembly supports the slider head above the disk media. The control means is physically coupled to the head gimbal assembly and electrically coupled to the writer and the reader for reducing write interference from the writer when the writer is writing to the disk media while the reader is reading from the disk media, wherein write interference is reduced in one or more of a time domain and a frequency domain.Type: ApplicationFiled: July 30, 2014Publication date: June 9, 2016Inventors: Jingliang ZHANG, Zhimin YUAN, Siang Huei LEONG, Budi SANTOSO, Pantelis Sophoclis ALEXOPOULOS
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Publication number: 20160140989Abstract: In various embodiments, a read assembly for reading a dual-layered medium may be provided. The dual-layered medium may include a servo layer and a data layer over the servo layer. The read assembly may include a data read head configured to read the data layer. The read assembly may also include a servo read head configured to read the servo layer.Type: ApplicationFiled: June 25, 2014Publication date: May 19, 2016Applicant: MARVELL INTERNATIONAL LTD.Inventors: Yunjie CHEN, Siang Huei LEONG, Bo LIU
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Patent number: 9343083Abstract: A system including a write head, a read head, a mixer, and a filter. The write head is configured to write a pattern on a track of a medium of a hard disk drive, wherein the pattern has a first frequency. The read head is configured to read the pattern written on the track of the medium of the hard disk drive. The mixer is configured to mix a first signal generated by reading the pattern with a second signal to obtain a mixed signal. The second signal has a second frequency, and wherein the second frequency is different than the first frequency. The filter is configured to filter the mixed signal to determine a relative head-to-disk speed. The filter has a parameter selected based on a difference between the first frequency and the second frequency.Type: GrantFiled: June 29, 2015Date of Patent: May 17, 2016Assignee: Marvell International LTD.Inventors: Budi Santoso, Zhimin Yuan, Siang Huei Leong, Chun Lian Ong, Pantelis Alexopoulos
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Patent number: 9336829Abstract: Various embodiments provide a recording medium. The recording medium may include: a dedicated servo layer for providing servo information, wherein the dedicated servo layer comprises a plurality of tracks, wherein a first track comprises a first servo signal of a first frequency, wherein a second track comprises a second servo signal of a second frequency, and wherein the first servo signal and the second servo signal comprise a common single tone signal.Type: GrantFiled: November 21, 2012Date of Patent: May 10, 2016Assignee: Marvell International Ltd.Inventors: Jingliang Zhang, Siang Huei Leong, Zhimin Yuan, Bo Liu
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Patent number: 9318139Abstract: In the present disclosure, a recording medium and a method of preparing a recording medium is provided. In a recording medium, a first annular servo track can be provided on a first layer of the recording medium, and second annular servo track can be provided on the first layer of the recording medium. The second annular servo track can be adjacent to the first annular servo track. In the recording medium, the first annular servo track and the second annular servo track are magnetically polarized and are magnetically opposing in polarity. A corresponding method of preparing a recording medium is provided.Type: GrantFiled: July 25, 2013Date of Patent: April 19, 2016Assignee: Marvell International Ltd.Inventors: Chun Lian Ong, Zhimin Yuan, Shiming Ang, Budi Santoso, Jingliang Zhang, Siang Huei Leong
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Patent number: 9257135Abstract: A system for reading data from a storage medium. The system includes a reader and a data determination circuit. The reader is configured to receive a first signal from a first position relative to the storage medium and read a second signal from a second position relative to the storage medium. Each of the first signal and the second signal includes a combination of first data stored in a first track and second data stored in a second track. The data determination circuit is configured to determine third data stored at a predetermined position using the combination of the first data stored in the first track and the second data stored in the second track as received in the first signal and the combination of the first data stored in the first track and the second data stored in the second track as received in the second signal.Type: GrantFiled: July 13, 2015Date of Patent: February 9, 2016Assignee: Marvell International Ltd.Inventors: Chun Lian Ong, Zhimin Yuan, Siang Huei Leong, Bo Liu
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Patent number: 9202512Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.Type: GrantFiled: August 31, 2012Date of Patent: December 1, 2015Assignee: Marvell International LTD.Inventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Publication number: 20150325257Abstract: A system for reading data from a storage medium. The system includes a reader and a data determination circuit. The reader is configured to receive a first signal from a first position relative to the storage medium and read a second signal from a second position relative to the storage medium. Each of the first signal and the second signal includes a combination of first data stored in a first track and second data stored in a second track. The data determination circuit is configured to determine third data stored at a predetermined position using the combination of the first data stored in the first track and the second data stored in the second track as received in the first signal and the combination of the first data stored in the first track and the second data stored in the second track as received in the second signal.Type: ApplicationFiled: July 13, 2015Publication date: November 12, 2015Inventors: Chun Lian Ong, Zhimin Yuan, Siang Huei Leong, Bo Liu
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Patent number: 9177598Abstract: A device may be provided. The device includes a media including a servo layer and a data recording layer, and a recording head including a dimension sized to produce a magnetic writing field to write servo information on the servo layer.Type: GrantFiled: November 21, 2012Date of Patent: November 3, 2015Assignee: Marvell International Ltd.Inventors: Siang Huei Leong, Zhimin Yuan, Bo Liu, Joo Boon Marcus Lim
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Publication number: 20150302871Abstract: A system including a write head, a read head, a mixer, and a filter. The write head is configured to write a pattern on a track of a medium of a hard disk drive, wherein the pattern has a first frequency. The read head is configured to read the pattern written on the track of the medium of the hard disk drive. The mixer is configured to mix a first signal generated by reading the pattern with a second signal to obtain a mixed signal. The second signal has a second frequency, and wherein the second frequency is different than the first frequency. The filter is configured to filter the mixed signal to determine a relative head-to-disk speed. The filter has a parameter selected based on a difference between the first frequency and the second frequency.Type: ApplicationFiled: June 29, 2015Publication date: October 22, 2015Inventors: Budi Santoso, Zhimin Yuan, Siang Huei Leong, Chun Lian Ong, Pantelis Alexopoulos
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Patent number: 9082418Abstract: According to various embodiments, a method for reading data from a storage medium using a reader may be provided. The method may include: reading a first signal with a reader head of the reader at a first position of the storage medium; reading a second signal with a reader head of the reader at a second position of the storage medium; and determining data stored at a pre-determined position of the storage medium based on the first signal and based on the second signal.Type: GrantFiled: July 16, 2013Date of Patent: July 14, 2015Assignee: MARVELL INTERNATIONAL LTD.Inventors: Chun Lian Ong, Zhimin Yuan, Siang Huei Leong, Bo Liu
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Patent number: 9070416Abstract: Methods and architecture for monitoring hard disk drive operation is provided. The hard disk drive system provided includes a spindle, a head and a disk with a disk medium including a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track. The method includes the steps of writing a wide track pattern having a predetermined frequency on a track of a hard disk drive medium, generating a readback signal by reading the pattern from the track, processing the readback signal by mixing the readback signal with a reference signal to obtain a mixed signal having a summed signal and a difference signal, and filtering the mixed signal by a filter centered around the difference signal to generate a measurement signal corresponding to a relative speed change of the spindle and a head-to-disk motion.Type: GrantFiled: May 10, 2013Date of Patent: June 30, 2015Assignee: Marvell International LTD.Inventors: Budi Santoso, Zhimin Yuan, Siang Huei Leong, Chun Lian Ong, Pantelis Alexopoulos
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Publication number: 20150179198Abstract: In the present disclosure, a recording medium and a method of preparing a recording medium is provided. In a recording medium, a first annular servo track can be provided on a first layer of the recording medium, and second annular servo track can be provided on the first layer of the recording medium. The second annular servo track can be adjacent to the first annular servo track. In the recording medium, the first annular servo track and the second annular servo track are magnetically polarized and are magnetically opposing in polarity. A corresponding method of preparing a recording medium is provided.Type: ApplicationFiled: July 25, 2013Publication date: June 25, 2015Applicant: Marvell International Ltd.Inventors: Chun Lian Ong, Zhimin Yuan, Shiming Ang, Budi Santoso, Jingliang Zhang, Siang Huei Leong
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Publication number: 20150146322Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.Type: ApplicationFiled: August 31, 2012Publication date: May 28, 2015Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Chao Bi, Kui Cai, Kheong Sann Chan, Zhi Yong Ching, Moulay Rachid Elidrissi, Guchang Han, Zhimin He, Phyu Hla Nu, Jiang Feng Hu, Wei Hua, Quan Jiang, Siang Huei Leong, Wuzhong Lin, Bo Liu, Yansheng Ma, Chun Lian Ong, Jianzhong Shi, Cheng Su Soh, Sufui Sophia Tan, Li Wang, Chiew Leong Wong, Weiya Xi, Khai Leong Yong, Shengkai Yu, Yin Quan Yu, Zhimin Yuan, Jing Liang Zhang, Tiejun Zhou, Pantelis Alexopoulos, Budi Santoso, Qide Zhang, Kannan Sundaravadivelu, Ningyu Liu, Jianqiang Mou, Chong Wee Lee, Ke Gan, Boon Long Ibrahim See, Leonard Gonzaga, Wee Kiat Lim, Mengjun Liu, Venkataramanan Venkatakrishnan, Cheng Peng Tan
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Patent number: 8792211Abstract: A data storage device with a heat assisted magnetic recording (HAMR) system, a magnetic recording medium, and method for data storage are provided. The data storage device includes a magnetic recording medium, a magnetic recording head, a power supply, a controller and a switching device. The magnetic recording head includes a main pole having a surface area facing the magnetic recording medium. The controller is coupled to the magnetic recording head for controlling writing information to and reading information from the magnetic recording medium. The switching device electrically couples the power supply between the main pole and the magnetic recording medium in response to a signal provided from the controller when writing information to the magnetic recording medium. The magnetic recording medium comprises a plurality of layers, including a heating layer, a field enhanced conduction layer, and an electrode layer.Type: GrantFiled: December 31, 2010Date of Patent: July 29, 2014Assignee: Agency for Science, Technology and ResearchInventors: Zhimin Yuan, Bo Liu, Boon Hao Low, Tiejun Zhou, Siang Huei Leong, Mingsheng Zhang
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Patent number: 8792193Abstract: A magnetic media tester comprising a Laser Doppler Vibrometer (LDV) head; and a magnetic read head; the LDV head and the magnetic read head being configured for obtaining correlatable data of a region on a magnetic disk.Type: GrantFiled: March 26, 2010Date of Patent: July 29, 2014Assignee: Agency for Science, Technology and ResearchInventors: Siang Huei Leong, Budi Santoso, Chun Lian Ong, Joo Boon Marcus Travis Lim, Zhimin Yuan, Kaidong Ye