Patents by Inventor Guoxiao Guo
Guoxiao Guo 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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Publication number: 20230402062Abstract: Various illustrative aspects are directed to a data storage device, comprising: one or more disks; an actuating mechanism comprising one or more heads, and configured to position the one or more heads proximate to disk surfaces of the one or more disks; and one or more processing devices. The one or more processing devices are configured to: determine a first burst value based on an averaged value of a first set of one or more bursts; determine a second burst value based on an averaged value of a second set of one or more bursts; generate a position error signal (PES) based on the determined first burst value and the determined second burst value; and control a position of at least one head among the one or more heads based on the PES.Type: ApplicationFiled: June 13, 2022Publication date: December 14, 2023Inventors: Kei Yasuna, Guoxiao Guo, Ichiro Yokokawa
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Patent number: 11830524Abstract: Various illustrative aspects are directed to a data storage device, comprising: one or more disks; an actuating mechanism comprising one or more heads, and configured to position the one or more heads proximate to disk surfaces of the one or more disks; and one or more processing devices. The one or more processing devices are configured to: determine a first burst value based on an averaged value of a first set of one or more bursts; determine a second burst value based on an averaged value of a second set of one or more bursts; generate a position error signal (PES) based on the determined first burst value and the determined second burst value; and control a position of at least one head among the one or more heads based on the PES.Type: GrantFiled: June 13, 2022Date of Patent: November 28, 2023Assignee: WESTERN DIGITAL TECHNOLOGIES, INCInventors: Kei Yasuna, Guoxiao Guo, Ichiro Yokokawa
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Patent number: 11798587Abstract: Various illustrative aspects are directed to a data storage device comprising: a voice coil motor (VCM) and one or more processing devices, configured to actuate the VCM, switch on measuring a back electromotive force (BEMF) from the VCM for intervals of an initial BEMF measurement that are free of spikes in the initial BEMF measurement, and process a measured BEMF signal from the intervals of the initial BEMF measurement that are free of spikes in a change of current term of the initial BEMF measurement.Type: GrantFiled: March 14, 2022Date of Patent: October 24, 2023Assignee: Western Digital Technologies, Inc.Inventors: Guoxiao Guo, Jianbin Nie, Triet Tieu, Duc H. Banh, Tianyu Jiang
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Publication number: 20230317107Abstract: Various illustrative aspects are directed to a data storage device comprising: a voice coil motor (VCM) and one or more processing devices, configured to actuate the VCM, switch on measuring a back electromotive force (BEMF) from the VCM for intervals of an initial BEMF measurement that are free of spikes in the initial BEMF measurement, and process a measured BEMF signal from the intervals of the initial BEMF measurement that are free of spikes in a change of current term of the initial BEMF measurement.Type: ApplicationFiled: March 14, 2022Publication date: October 5, 2023Inventors: Guoxiao Guo, Jianbin Nie, Triet Tieu, Duc H. Banh, Tianyu Jiang
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Patent number: 11587587Abstract: Various illustrative aspects are directed to a data storage device, comprising: one or more disks; an actuator assembly comprising a head, and configured to position the head over a corresponding disk surface; and one or more processing devices, the head comprising: a write element; a laser unit; and a fly height control element, and wherein the one or more processing devices are configured to: iteratively perform spiral write operations of spiral patterns comprising a plurality of sync marks with the head on the corresponding disk surface, wherein the spiral write operations are performed at: a plurality of values of laser pre-bias current, write backoff, and/or start disk phase; detect pattern signal amplitudes of the spiral patterns on the corresponding disk surface; and determine a relation of write backoff to laser pre-bias current for the head, based on the pattern signal amplitudes of the spiral patterns.Type: GrantFiled: February 23, 2022Date of Patent: February 21, 2023Assignee: Western Digital Technologies, Inc.Inventors: Kei Yasuna, Guoxiao Guo, Masaru Furukawa, Shaomin Xiong, Duc H. Banh
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Patent number: 11587586Abstract: Various illustrative aspects are directed to a data storage device, comprising: one or more disks; an actuator assembly comprising a head, and configured to position the head over a corresponding disk surfaces; and one or more processing devices, wherein the head comprises: a write element; a laser unit; and a fly height control element, and wherein the one or more processing devices are configured to: iteratively perform write start operations of write start patterns with the head on the corresponding disk surface, at a plurality of values of at least one of laser pre-bias current, and write backoff; detect pattern signal amplitudes of the write start patterns on the corresponding disk surface; and determine a relation of write backoff to laser pre-bias current for the head, based at least in part on the pattern signal amplitudes.Type: GrantFiled: February 15, 2022Date of Patent: February 21, 2023Assignee: Western Digital Technologies, Inc.Inventors: Kei Yasuna, Guoxiao Guo, Masaru Furukawa, Shaomin Xiong, Duc H. Banh
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Patent number: 11482247Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media comprising a plurality of tracks. A first pattern of magnetic transitions is written to a first segment of a first track. Preparation is made to write a second pattern of magnetic transitions to a second segment of a second track adjacent the first segment of the first track. When the second pattern matches the first pattern, a write boost is configured to a first setting, and when the second pattern does not match the first pattern, the write boost is configured to a second setting. The second pattern of magnetic transitions is then written to the second segment of the second track using the configured write boost.Type: GrantFiled: February 23, 2021Date of Patent: October 25, 2022Assignee: Western Digital Technologies, Inc.Inventors: Guoxiao Guo, Charles A. Park, David Scott C. Amiss, Duc H. Banh, Joey M. Poss, Weldon M. Hanson
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Publication number: 20220246173Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media comprising a plurality of tracks. A first pattern of magnetic transitions is written to a first segment of a first track. Preparation is made to write a second pattern of magnetic transitions to a second segment of a second track adjacent the first segment of the first track. When the second pattern matches the first pattern, a write boost is configured to a first setting, and when the second pattern does not match the first pattern, the write boost is configured to a second setting. The second pattern of magnetic transitions is then written to the second segment of the second track using the configured write boost.Type: ApplicationFiled: February 23, 2021Publication date: August 4, 2022Inventors: Guoxiao Guo, Charles A. Park, David Scott C. Amiss, Duc H. Banh, Joey M. Poss, Weldon M. Hanson
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Patent number: 11200912Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media. A write boost is configured to a first setting, and a first pattern of magnetic transitions is written to a first servo field of a servo sector on the magnetic media using the first setting for the write boost. The write boost is configured to a second setting different from the first setting, and the first pattern of magnetic transitions is written to a second servo field of the servo sector on the magnetic media using the second setting for the write boost.Type: GrantFiled: February 23, 2021Date of Patent: December 14, 2021Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Guoxiao Guo, Charles A. Park, David Scott C. Amiss, Duc H. Banh, Joey M. Poss, Weldon M. Hanson
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Patent number: 10923146Abstract: A data storage device is disclosed comprising a head actuated over a disk. The head is used to read servo information from the disk and generate a position error signal (PES) representing a position of the head over the disk. A control signal is generated based on the PES and a triangle-shape dither signal, and the head is positioned over the disk using the control signal.Type: GrantFiled: June 5, 2020Date of Patent: February 16, 2021Assignee: Western Digital Technologies, Inc.Inventors: Guoxiao Guo, Edgar D. Sheh, Kei Yasuna, Due H. Banh
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Patent number: 10733061Abstract: Systems and methods are disclosed for accessing data on a storage system. An apparatus, such as a data storage device or a computing device, may include a memory configured to store data. The apparatus is configured to determine an importance level for a file to be stored in the storage system. The data storage system includes one or more private storage clouds and one or more public storage clouds. The apparatus is also configured to generate a set of recovery data chunks based on the file and the importance level. The apparatus is further configured to store the set of recovery data chunks in the set of public storage clouds. The apparatus is further configured to store at least a portion of the file in the private storage cloud.Type: GrantFiled: June 27, 2017Date of Patent: August 4, 2020Assignee: Western Digital Technologies, Inc.Inventors: Jun Xu, Wei Xi, Guoxiao Guo, Eric Bjornson, Jie Yu, Ling Chih Wei
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Patent number: 10410656Abstract: A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a spin torque oscillator (STO). A first bias signal is applied to the STO during a first interval preceding a write operation to write data to the disk, wherein the first bias signal causes the STO to protrude toward the disk. After the first interval, a second bias signal is applied to the STO during a second interval spanning at least part of the write operation, wherein an amplitude of the first bias signal is in the range of 1.1 to 1.5 times an amplitude of the second bias signal.Type: GrantFiled: December 4, 2018Date of Patent: September 10, 2019Assignee: Western Digital Technologies, Inc.Inventors: Guoxiao Guo, Soo-Choon Kang, Hongchao T. Zhao, David Scott C. Amiss, Duc H. Banh
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Patent number: 10289310Abstract: Systems and methods are disclosed for accessing data on a storage system. An apparatus, such as a data storage device or a computing device, may include a memory configured to store data. The apparatus is configured to receive a request for a file stored in a storage system. The storage system includes a private storage cloud and a set of public storage clouds. The apparatus is also configured to determine whether the file is retrievable from the set of public storage clouds. If the file is retrievable from the set of public storage clouds the apparatus may determine whether access to the set of public storage clouds is faster than access to the private storage cloud and may retrieve the file from one or more of the private storage cloud and the set of public storage clouds.Type: GrantFiled: June 27, 2017Date of Patent: May 14, 2019Assignee: Western Digital Technologies, Inc.Inventors: Jun Xu, Wei Xi, Guoxiao Guo, Eric Bjornson, Jie Yu, Ling Chih Wei
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Publication number: 20180373439Abstract: Systems and methods are disclosed for accessing data on a storage system. An apparatus, such as a data storage device or a computing device, may include a memory configured to store data. The apparatus is configured to receive a request for a file stored in a storage system. The storage system includes a private storage cloud and a set of public storage clouds. The apparatus is also configured to determine whether the file is retrievable from the set of public storage clouds. If the file is retrievable from the set of public storage clouds the apparatus may determine whether access to the set of public storage clouds is faster than access to the private storage cloud and may retrieve the file from one or more of the private storage cloud and the set of public storage clouds.Type: ApplicationFiled: June 27, 2017Publication date: December 27, 2018Inventors: Jun XU, Wei XI, Guoxiao GUO, Eric BJORNSON, Jie YU, Ling Chih WEI
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Publication number: 20180373600Abstract: Systems and methods are disclosed for accessing data on a storage system. An apparatus, such as a data storage device or a computing device, may include a memory configured to store data. The apparatus is configured to determine an importance level for a file to be stored in the storage system. The data storage system includes one or more private storage clouds and one or more public storage clouds. The apparatus is also configured to generate a set of recovery data chunks based on the file and the importance level. The apparatus is further configured to store the set of recovery data chunks in the set of public storage clouds. The apparatus is further configured to store at least a portion of the file in the private storage cloud.Type: ApplicationFiled: June 27, 2017Publication date: December 27, 2018Inventors: Jun XU, Wei XI, Guoxiao GUO, Eric BJORNSON, Jie YU, Ling Chih WEI
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Patent number: 9959052Abstract: Write commands are received for a Data Storage Device (DSD) to store write data in a plurality of corresponding write locations on at least one disk of the DSD. At least a portion of the write data is cached in at least one Media Based Cache (MBC) region of the at least one disk based on a write cache policy for determining which write data is eligible for caching in the at least one MBC region. The at least one MBC region is used to cache data to be stored in other locations on the at least one disk. During an active time period when host commands are performed on the at least one disk, a portion of an I/O bandwidth for performing commands is used to copy the at least a portion of the write data to corresponding write locations of the plurality of corresponding write locations.Type: GrantFiled: September 17, 2015Date of Patent: May 1, 2018Assignee: Western Digital Technologies, Inc.Inventors: Jun Xu, Wei Xi, Guoxiao Guo, Jianyi Wang, Junpeng Niu
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Publication number: 20170011763Abstract: A data storage device includes a disk, a head, a microactuator, a coarse actuator, and a servo controller. The microactuator is configured to position the head relative to the disk. The coarse actuator is configured to position the microactuator relative to the disk. The servo controller is configured to generate an adjusted position error signal based on a position error signal and an estimated microactuator position signal. The servo controller is also configured to filter the adjusted position error signal with a shaping filter to generate a filtered position error signal, and to provide sliding mode control of the coarse actuator based at least partially on the filtered position error signal.Type: ApplicationFiled: August 17, 2015Publication date: January 12, 2017Applicants: Western Digital Technologies, Inc., The Regents of the University of CaliforniaInventors: Minghui Zheng, Masayoshi Tomizuka, Xu Chen, Wei Xi, Guoxiao Guo
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Patent number: 9542966Abstract: A data storage device includes a disk, a head, a microactuator, a coarse actuator, and a servo controller. The microactuator is configured to position the head relative to the disk. The coarse actuator is configured to position the microactuator relative to the disk. The servo controller is configured to generate an adjusted position error signal based on a position error signal and an estimated microactuator position signal. The servo controller is also configured to filter the adjusted position error signal with a shaping filter to generate a filtered position error signal, and to provide sliding mode control of the coarse actuator based at least partially on the filtered position error signal.Type: GrantFiled: August 17, 2015Date of Patent: January 10, 2017Assignees: Western Digital Technologies, Inc., The Regents of the University of CaliforniaInventors: Minghui Zheng, Masayoshi Tomizuka, Xu Chen, Wei Xi, Guoxiao Guo
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Publication number: 20160351219Abstract: 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 and a plurality of proximate track IDs is generated having values proximate the estimated track ID. A set of Gray codes is generated each corresponding to the estimated track ID and the proximate track IDs, wherein each Gray code in the set of Gray codes comprises N bits, and M bits out of a high order of the N bits comprise the same value. A recorded Gray code is detected in a first servo sector to generate a detected Gray code, and an error in the detected Gray code is corrected by inverting at least one bit in the detected Gray code comprising a value that is different from the value of the corresponding bit in the M bits.Type: ApplicationFiled: August 12, 2016Publication date: December 1, 2016Inventors: GUOXIAO GUO, DONALD BRUNNETT, JIANGUO ZHOU, WAI EE WONG
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Patent number: 9454989Abstract: A disk drive is disclosed comprising a disk comprising a plurality of servo sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones, where a servo data rate of servo sectors in a first servo zone is different than a servo data rate of servo sectors in a second servo zone. A servo control system servos a head over the disk. An estimated servo state of a servo control system is generated, and when the head crosses from a first servo zone to a second servo zone, the estimated servo state is adjusted to compensate for a transient in a circumferential distance between a servo sector in the first servo zone and a servo sector in the second servo zone.Type: GrantFiled: March 11, 2015Date of Patent: September 27, 2016Assignee: Western Digital Technologies, Inc.Inventors: Michael Chang, Guoxiao Guo, Jie Yu