Patents by Inventor Samuel Gan
Samuel Gan 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: 10388314Abstract: Apparatus and method for reducing the effects of thermal asperities on a rotatable data recording surface. A data transducer writes user data to a first set of tracks at a first fly height above the recording surface. A compensation circuit detects a thermal asperity (TA) on the recording surface, and establishes a guard band as a second set of tracks that are co-radial with the TA. The second set of tracks are deallocated and removed from service. The compensation circuit further defines a reserve band as a third set of tracks immediately adjacent the guard band, and selects an increased, second fly height that allows the data transducer to write data to the reserve band without contacting the TA. The second set of tracks may have a greater track pitch than the first set of tracks to compensate for the greater fly height.Type: GrantFiled: April 12, 2018Date of Patent: August 20, 2019Assignee: Seagate Technology LLCInventors: Xiong Liu, Lan Xia, Quan Li, Lihong Zhang, Swee Chuan Samuel Gan
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Patent number: 10199067Abstract: Apparatus and method for proactively cleaning a data storage surface subjected to a mechanical disturbance. In some embodiments, data access commands are serviced by a data storage device to transfer user data between a host device and a rotatable data recording surface using a radially moveable data transducer. A media cleaning operation is scheduled and performed in response to the detection of a mechanical disturbance event externally applied to the data storage device. The media cleaning operation involves sweeping the data transducer across the data recording surface from a first radius to a second radius over a selected time duration. The entirety of the data recording surface is swept if sufficient time is available between pending commands to maintain a desired host data transfer rate. Otherwise, a partial cleaning operation is scheduled in which portions of the recording surface are successively cleaned between the servicing of the pending commands.Type: GrantFiled: March 23, 2018Date of Patent: February 5, 2019Assignee: Seagate Technology LLCInventors: Swee Chuan Samuel Gan, Lihong Zhang, Xiong Liu, ChengYi Guo
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Publication number: 20180330763Abstract: A data storage device may be configured with a transducing head separated from a data storage medium by an air bearing. The transducing head and data storage medium are each contained within a housing. The transducing head can consist of a variable resistance sensor that is connected to a temperature module positioned within the housing. One or more operational variables can be measured by the variable resistance sensor to allow an ambient temperature within the housing to be calculated based on a measured operational variable.Type: ApplicationFiled: May 9, 2017Publication date: November 15, 2018Inventors: Lihong Zhang, Samuel Gan, Xiong Liu, Tanghe Guo, Takashi Fujita
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Patent number: 10127950Abstract: A data storage device may be configured with a transducing head separated from a data storage medium by an air bearing. The transducing head and data storage medium are each contained within a housing. The transducing head can consist of a variable resistance sensor that is connected to a temperature module positioned within the housing. One or more operational variables can be measured by the variable resistance sensor to allow an ambient temperature within the housing to be calculated based on a measured operational variable.Type: GrantFiled: May 9, 2017Date of Patent: November 13, 2018Assignee: Seagate Technology LLCInventors: Lihong Zhang, Samuel Gan, Xiong Liu, Tanghe Guo, Takashi Fujita
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Patent number: 9881642Abstract: The present application provides a transducer head comprising a laser source configured to heat a target storage medium surface, and a thermal sensor configured to detect a defect on the target storage medium surface. The present application also provides a method comprising heating a target storage medium surface with an energy source configured in a transducer head to irradiate the target storage medium surface, and detecting a defect on the target storage medium surface using a thermal sensor configured in the transducer head. Other implementations are also described and recited herein.Type: GrantFiled: March 31, 2015Date of Patent: January 30, 2018Assignee: SEAGATE TECHNOLOGY LLCInventors: Lihong Zhang, Samuel Gan, Xiong Liu
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Patent number: 9679595Abstract: A method comprises sensing for thermal asperities while sequentially scanning a plurality of tracks of a magnetic recording medium in a first direction relative to an inner or outer diameter of the medium. The method comprises halting the scanning at a first track in response to detecting a thermal asperity at the first track, and skipping a predetermined number of tracks in the first direction to a second track. The method also comprises sensing for the thermal asperity while sequentially scanning the plurality of tracks beginning with the second track in a second direction opposite the first direction. The method further comprises halting the scanning at a third track in response to detecting the thermal asperity at the third track, and logging the first and third tracks as tracks between which the thermal asperity is located.Type: GrantFiled: March 30, 2016Date of Patent: June 13, 2017Assignee: SEAGATE TECHNOLOGY LLCInventors: Lihong Zhang, Xiong Liu, Samuel Gan
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Publication number: 20160293203Abstract: The present application provides a transducer head comprising a laser source configured to heat a target storage medium surface, and a thermal sensor configured to detect a defect on the target storage medium surface. The present application also provides a method comprising heating a target storage medium surface with an energy source configured in a transducer head to irradiate the target storage medium surface, and detecting a defect on the target storage medium surface using a thermal sensor configured in the transducer head. Other implementations are also described and recited herein.Type: ApplicationFiled: March 31, 2015Publication date: October 6, 2016Inventors: Lihong Zhang, Samuel Gan, Xiong Liu
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Patent number: 9153265Abstract: A slider generally comprises a substrate forming at least part of a body of the slider, a heat-assisted media recording (HAMR) read/write transducer proximate the substrate, and an end cap substantially encapsulating the HAMR read/write transducer. The end cap has a first surface proximate the substrate and a second surface as a trailing edge of the slider. The end cap has a first coefficient of thermal expansion (CTE) similar to a corresponding CTE of the substrate. At least a portion of the second surface of the end cap has a second CTE that is lower than the first CTE. A body of the end cap is intermediate to the first and second surfaces of the end cap and has a CTE intermediate of the first and second CTE.Type: GrantFiled: August 22, 2014Date of Patent: October 6, 2015Assignee: SEAGATE TECHNOLOGY LLCInventors: Xiong Liu, Lihong Zhang, Samuel Gan, Shashwat Shukla
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Patent number: 9129633Abstract: A device may be configured at least with a controller connected to a transducer or transducing assembly that is positioned proximal a data storage medium having at least one thermal asperity or other similar defect. The controller may be configured to select a clearance height above the data storage medium in response to a measured severity of the at least one thermal asperity.Type: GrantFiled: August 22, 2014Date of Patent: September 8, 2015Assignee: Seagate Technology LLCInventors: Samuel Gan, LiHong Zhang, Xiong Liu
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Publication number: 20140268406Abstract: Apparatus and method for positional sensing and control. In accordance with some embodiments, a transducer is positioned adjacent a recording medium. The transducer includes a write element, a read element, a heater and a thermally responsive sensor. Power is applied to the heater to establish a selected fly height of the transducer relative to the medium. A contact event between the transducer and the medium is detected responsive to an accumulated plural count of pulses in a bias signal obtained from the thermally responsive sensor.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Inventors: CheeWee Cheng, Subhash Guddati, ShengYuan Lin, Andy Chou, SweeChuan Samuel Gan, Stefan Ionescu, Scott Ryun, Richard Martin, Jesse Speckhard
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Patent number: 8837076Abstract: Apparatus and method for positional sensing and control. In accordance with some embodiments, a transducer is positioned adjacent a recording medium. The transducer includes a write element, a read element, a heater and a thermally responsive sensor. Power is applied to the heater to establish a selected fly height of the transducer relative to the medium. A contact event between the transducer and the medium is detected responsive to an accumulated plural count of pulses in a bias signal obtained from the thermally responsive sensor.Type: GrantFiled: March 15, 2013Date of Patent: September 16, 2014Assignee: Seagate Technology LLCInventors: CheeWee Cheng, Subhash Guddati, ShengYuan Lin, Andy Chou, SweeChuan Samuel Gan, Stefan Ionescu, Scott Ryun, Richard Martin, Jesse Speckhard
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Patent number: 8760980Abstract: Apparatus for recording data and method for making the same. In accordance with some embodiments, a magnetic recording layer is adapted to store data along perpendicular magnetic domains. A protective overcoat layer is formed on the magnetic recording layer to substantially protect the magnetic recording layer from environmental effects. The protective overcoat layer is made of carbon intermixed with at least one transition metal, such as but not limited to chromium.Type: GrantFiled: February 26, 2013Date of Patent: June 24, 2014Assignee: Seagate Technology LLCInventors: Lihong Zhang, Samuel Gan
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Patent number: 7584859Abstract: Apparatus for separating agricultural produce from stones and clods including at least one generally cylindrical separation assembly arranged to be impinged upon by a mixture of agricultural produce and at least one of stones and clods, the at least one generally cylindrical separation assembly including a plurality of generally mutually contiguous curved impact portions and a mounting assembly supporting the plurality of generally mutually contiguous curved impact portions, the mounting assembly including a metal principal support and at least one intermediate metal support element fixed to the metal principal support and to at least some of the plurality of generally mutually contiguous curved impact portions, the at least one intermediate metal support element having a resiliency greater than a resiliency of the metal principal support.Type: GrantFiled: August 24, 2006Date of Patent: September 8, 2009Assignee: The State of Israel, Ministry of Agriculture & Rural Development Agricultural Research Organization, Volcani CenterInventors: Samuel Gan-Mor, Ofer Juran
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Publication number: 20080047879Abstract: Apparatus for separating agricultural produce from stones and clods including at least one generally cylindrical separation assembly arranged to be impinged upon by a mixture of agricultural produce and at least one of stones and clods, the at least one generally cylindrical separation assembly including a plurality of generally mutually contiguous curved impact portions and a mounting assembly supporting the plurality of generally mutually contiguous curved impact portions, the mounting assembly including a metal principal support and at least one intermediate metal support element fixed to the metal principal support and to at least some of the plurality of generally mutually contiguous curved impact portions, the at least one intermediate metal support element having a resiliency greater than a resiliency of the metal principal support.Type: ApplicationFiled: August 24, 2006Publication date: February 28, 2008Applicants: ORGANIZATION, VOLCANI CENTERInventors: Samuel Gan-Mor, Ofer Juran