Patents by Inventor David H. Jen
David H. Jen 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: 9542104Abstract: A method of controlling a storage device includes detecting a cumulative usage condition associated with the storage device, comparing the cumulative usage condition to a usage value, and adjusting the operation of the storage device based on the comparison. Another method of controlling a storage device includes detecting an operating condition associated with the storage device, comparing the operating condition to a warranty condition, and limiting the operation of the storage device to read-only operation based on the comparison.Type: GrantFiled: August 5, 2013Date of Patent: January 10, 2017Assignee: Western Digital Technologies, Inc.Inventors: Paul M. Green, David H. Jen, Remmelt Pit
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Patent number: 9368137Abstract: Cleaning a recording head slider in-drive during operation is accomplished by periodically performing a series of full stroke seek operations, whereby liquid contaminants that may have migrated to the head slider are flung from the slider and liquid from the disk surface may be adsorbed onto the slider for removal by way of flinging. Consequently, head-disk spacing may be stabilized and data write operations improved. Furthermore, the series of full stroke seek operations may be performed at predetermined intervals, and for a predetermined period of time. However, the series may be interrupted by a client request, and continued thereafter, so as not to affect the operational status of the recording system.Type: GrantFiled: October 17, 2014Date of Patent: June 14, 2016Assignee: HGST Netherlands B.V.Inventors: Annamica Bhan, Jorge F. Escobar, David H. Jen, Scott McCoy, Thomas Nguyen, Vedantham Raman, Kris Schouterden
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Publication number: 20160111114Abstract: Cleaning a recording head slider in-drive during operation is accomplished by periodically performing a series of full stroke seek operations, whereby liquid contaminants that may have migrated to the head slider are flung from the slider and liquid from the disk surface may be adsorbed onto the slider for removal by way of flinging. Consequently, head-disk spacing may be stabilized and data write operations improved. Furthermore, the series of full stroke seek operations may be performed at predetermined intervals, and for a predetermined period of time. However, the series may be interrupted by a client request, and continued thereafter, so as not to affect the operational status of the recording system.Type: ApplicationFiled: October 17, 2014Publication date: April 21, 2016Inventors: Annamica Bhan, Jorge F. Escobar, David H. Jen, Scott McCoy, Thomas Nguyen, Vedantham Raman, Kris Schouterden
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Patent number: 9070390Abstract: Systems, methods, and firmware for operating data storage devices and storage processors are provided herein. In one example, a data storage device is provided. The data storage device includes magnetic storage media configured to store data, read heads configured to read data from the magnetic storage media at associated areal densities, and a storage processor. The storage processor is configured to monitor read error rates of the read heads during operation of the data storage device to identify a degraded one of the read heads, and process at least the read error rates and an areal density of the degraded one of the read heads to modify the areal density of at least the degraded one of the read heads.Type: GrantFiled: October 31, 2013Date of Patent: June 30, 2015Inventors: Paul Marion Green, Remmelt Pit, David H. Jen
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Publication number: 20150117173Abstract: Systems, methods, and firmware for operating data storage devices and storage processors are provided herein. In one example, a data storage device is provided. The data storage device includes magnetic storage media configured to store data, read heads configured to read data from the magnetic storage media at associated areal densities, and a storage processor. The storage processor is configured to monitor read error rates of the read heads during operation of the data storage device to identify a degraded one of the read heads, and process at least the read error rates and an areal density of the degraded one of the read heads to modify the areal density of at least the degraded one of the read heads.Type: ApplicationFiled: October 31, 2013Publication date: April 30, 2015Applicant: HGST Netherlands B.V.Inventors: Paul Marion Green, Remmelt Pit, David H. Jen
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Publication number: 20150039806Abstract: A method of controlling a storage device includes detecting a cumulative usage condition associated with the storage device, comparing the cumulative usage condition to a usage value, and adjusting the operation of the storage device based on the comparison. Another method of controlling a storage device includes detecting an operating condition associated with the storage device, comparing the operating condition to a warranty condition, and limiting the operation of the storage device to read-only operation based on the comparison.Type: ApplicationFiled: August 5, 2013Publication date: February 5, 2015Applicant: HGST Netherlands B.V.Inventors: Paul M. Green, David H. Jen, Remmelt Pit
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Patent number: 8131920Abstract: A data formatting system and method to improve data efficiency and integrity in a hard disk are disclosed. One embodiment provides a disk drive system having a plurality of lookup tables which store a plurality of randomizer seeds which may be dynamically encoded into the preamble field of a customer data block if the customer data is deemed marginal. Encoding the randomizer seed into the preamble field prevents adjacent data track mis-writes and mis-reads.Type: GrantFiled: December 6, 2007Date of Patent: March 6, 2012Assignee: Hitachi Global Storage Technologies, Netherlands B.V.Inventors: Ryoheita Hattori, David H. Jen, Bernd Lamberts, Remmelt Pit, Kris Schouterden
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Patent number: 7920350Abstract: Data recovery information characterizes data recovery procedure (DRP) steps to be performed within a hard disk drive (HDD) in response to a miss. Particular data recovery information corresponds to a radial position of the actuator and, therefore, the position of the magnetic recording read/write head relative to the associated storage media at the location at which the miss occurred. The data recovery information is based on the physical shape of a write pole and on how the physical shape of the pole inherently affects operational data error associated with the head. Because of the foregoing characteristics of such data recovery information, a more efficient and performant data recovery procedure is performed based thereon.Type: GrantFiled: September 30, 2008Date of Patent: April 5, 2011Assignee: Hitachi Global Storage Technologies, Netherlands, B.V.Inventors: Hoan A. Au, Theofilos G. Fkiaras, David H. Jen, Bernd Lamberts, Kris Schouterden, Douglas M. Zuercher
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Publication number: 20100079903Abstract: Data recovery information characterizes data recovery procedure (DRP) steps to be performed within a hard disk drive (HDD) in response to a miss. Particular data recovery information corresponds to a radial position of the actuator and, therefore, the position of the magnetic recording read/write head relative to the associated storage media at the location at which the miss occurred. The data recovery information is based on the physical shape of a write pole and on how the physical shape of the pole inherently affects operational data error associated with the head. Because of the foregoing characteristics of such data recovery information, a more efficient and performant data recovery procedure is performed based thereon.Type: ApplicationFiled: September 30, 2008Publication date: April 1, 2010Inventors: Hoan A. Au, Theofilos G. Fkiaras, David H. Jen, Bernd Lamberts, Kris Schouterden, Douglas M. Zuercher
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Publication number: 20090150637Abstract: A data formatting system and method to improve data efficiency and integrity in a hard disk are disclosed. One embodiment provides a disk drive system having a plurality of lookup tables which store a plurality of randomizer seeds which may be dynamically encoded into the preamble field of a customer data block if the customer data is deemed marginal. Encoding the randomizer seed into the preamble field prevents adjacent data track mis-writes and mis-reads.Type: ApplicationFiled: December 6, 2007Publication date: June 11, 2009Inventors: Ryoheita Hattori, David H. Jen, Bernd Lamberts, Remmelt Pit, Kris Schouterden
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Patent number: 7486457Abstract: A method and apparatus for predicting write failure resulting from flying height modulation and initiating re-writing of data upon occurrence of the predicted write failure is disclosed. According to the present invention, if the slider or transducer flying height modulates during the write process, such modulation is detected, and a rewrite of the same data is forced. A write reassign may be initiated when a thermal signal exceeding the predetermined threshold is detected during the rewrite and/or a read/verify may be initiated after the rewrite.Type: GrantFiled: February 15, 2002Date of Patent: February 3, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: David H. Jen, Mike Suk
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Publication number: 20030156340Abstract: A method and apparatus for predicting write failure resulting from flying height modulation and initiating re-writing of data upon occurrence of the predicted write failure is disclosed. According to the present invention, if the slider or transducer flying height modulates during the write process, such modulation is detected, and a rewrite of the same data is forced. A write reassign may be initiated when a thermal signal exceeding the predetermined threshold is detected during the rewrite and/or a read/verify may be initiated after the rewrite.Type: ApplicationFiled: February 15, 2002Publication date: August 21, 2003Applicant: International Business Machines CorporationInventors: David H. Jen, Mike Suk
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Patent number: 6501624Abstract: A data storage system has a disk having a first, second and third zone. The first zone has rough texturing to prevent stiction between a slider at rest and the disk. The second zone has intermediate texturing to prevent stiction when a moving slider is in contact with the disk. The third zone has a smooth texture and is used for data recording. A control unit moves the slider between the zones as appropriate on power up and power down of the system. The system has an actuator latch having a bias device. The bias device allows the slider to be positioned between the first and second zones by selective energizing of the actuator while in the latched position.Type: GrantFiled: February 19, 1997Date of Patent: December 31, 2002Assignee: International Business Machines CorporationInventors: Donald Ray Gillis, David H. Jen, Mike Suk
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Patent number: 6405277Abstract: A method is described for storing data on a target track of a recordable medium in a storage device via a magnetic write head therein. The storage device has an operating parameter having an operational range with extreme at which the writing of data to said device is prohibited. A first threshold within said range is defined and proximate said first extreme and delimits a first operational subrange. The method including the steps of: monitoring said operating parameter; and determining whether the monitored parameter lies within said first subrange and if so, performing a first predetermined operation to compensate for deleterious effects on data storage caused thereby.Type: GrantFiled: November 6, 1998Date of Patent: June 11, 2002Assignee: International Business Machines CorporationInventors: David H. Jen, Daniel James Malone, Jay Michael Mosbrucker
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Patent number: 6101062Abstract: A method and apparatus for detecting harmful motion of a disk drive system to avoid a head crash. The motor spin current in the hard disk drive is used as a sensor to detect acceleration of the disk drive corresponding to a tipping or falling condition. In normal operation, the disk stack angular velocity (measured in revolutions per minute or RPM) is constantly monitored so that the disk drive control system can generate timing signals allowing the controller to accurately locate data addresses on the rotating disks. Disk stack RPM is accurately controlled at a constant value by a suitable feedback control loop which measures RPM and adjusts motor drive current to maintain the desired RPM. The rapidly rotating disk stack acts as a gyro system whose angular momentum resists any change in direction.Type: GrantFiled: December 8, 1997Date of Patent: August 8, 2000Assignee: International Business Machines CorporationInventors: David H. Jen, Mike Suk
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Patent number: 5827424Abstract: A contaminant reduction system is shown for a disk drive assembly having a closed interior and slider disk components located therein which would be adversely affected by condensed volatiles generated within the assembly. A Peltier element is located within the closed interior of the disk drive assembly so as to condense volatiles present within the interior at a desired condensation point within the closed interior. A getter material, such as a microporous sintered alumina, is located within the closed interior of the disk drive assembly at the condensation point for permanently trapping and maintaining condensed volatiles which are condensed by the Peltier element.Type: GrantFiled: September 26, 1996Date of Patent: October 27, 1998Assignee: International Business Machines CorporationInventors: Donald R. Gillis, Andrew Marian Homola, David H. Jen, Erhard T. Schreck
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Patent number: 5798884Abstract: A data storage system has a disk having a first, second and third zone. The first zone has rough texturing to prevent stiction between a slider at rest and the disk. The second zone has intermediate texturing to prevent stiction when a moving slider is in contact with the disk. The third zone has a smooth texture and is used for data recording. A control unit moves the slider between the zones as appropriate on power up and power down of the system. The system has an actuator latch having a bias device. The bias device allows the slider to be positioned between the first and second zones by selective energizing of the actuator while in the latched position.Type: GrantFiled: December 13, 1995Date of Patent: August 25, 1998Assignee: International Business Machines CorporationInventors: Donald Ray Gillis, David H. Jen, Mike Suk