Patents by Inventor KEVIN B. JUDD
KEVIN B. JUDD 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: 9892750Abstract: A computer-implemented method includes: determining a reading performance of a head positioned at a commanded lateral reading location based on one or more metrics; adjusting a lateral reading location of the head relative to a medium by moving the head in a lateral direction away from the commanded lateral reading location to an adjusted lateral reading location; determining a reading performance of the head after the adjusting; comparing the reading performance after the adjusting to the reading performance before the adjusting for determining whether the reading performance has improved; and selecting an optimal lateral reading location based on the comparing. The one or more metrics are selected from a group consisting of C1 error correction rate, and C2 error correction rate. Corresponding systems and computer program products are also disclosed.Type: GrantFiled: March 11, 2016Date of Patent: February 13, 2018Assignee: International Business Machines CorporationInventors: Ernest S. Gale, Randy C. Inch, Kevin B. Judd, David L. Swanson
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Patent number: 9685189Abstract: An apparatus according to one embodiment includes a motor having a rotor, a take up reel coupled to the rotor, and a damping layer positioned between the rotor and the take up reel. The damping layer is constructed of a visco-elastic material. An apparatus according to another embodiment includes a motor having a rotor, a clutch coupled to the rotor, and a damping layer positioned between the rotor and the clutch. The damping layer is constructed of a visco-elastic material.Type: GrantFiled: April 6, 2016Date of Patent: June 20, 2017Assignee: International Business Machines CorporationInventors: David H. F. Harper, Kevin B. Judd
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Patent number: 9472221Abstract: A computer program product, according one embodiment, includes a computer readable storage medium having program instructions embodied therewith, the program instructions readable and/or executable by a processing circuit to cause the processing circuit to: determine, by the processing circuit, an actual spacing between at least two servo tracks written on a magnetic tape based on signals from at least two servo writer elements; compare, by the processing circuit, the actual spacing with an intended spacing between the at least two servo tracks; and use, by the processing circuit, at least one actuator sandwiched between the servo writer elements to adjust a distance between the servo writer elements in response to determining that a difference between the actual spacing and the intended spacing is in a predetermined range.Type: GrantFiled: April 25, 2016Date of Patent: October 18, 2016Assignee: International Business Machines CorporationInventors: Nhan X. Bui, Edwin R. Childers, Kevin B. Judd
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Patent number: 9437241Abstract: In one embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith, the program instructions readable/executable by a controller to cause the controller to: determine and/or receive, by the controller, a selection of which of at least two track width formats to use during writing of data on a magnetic recording tape, wherein the track width format is selected based on an environmental condition; and cause, by the controller, simultaneous writing of a plurality of data tracks to the magnetic recording tape using only one of the track width formats at a same time such that each of the data tracks written at the same time has a track width that is substantially the same.Type: GrantFiled: May 21, 2015Date of Patent: September 6, 2016Assignee: International Business Machines CorporationInventors: Randy C. Inch, Kevin B. Judd
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Patent number: 9424877Abstract: A method according to one embodiment includes determining whether a current position error signal sample exceeds a stopwrite threshold, disabling writing in response to determining that the current position error signal sample exceeds the stopwrite threshold, and enabling writing in response to determining that the current position error signal sample does not exceed the stopwrite threshold.Type: GrantFiled: June 1, 2015Date of Patent: August 23, 2016Assignee: International Business Machines CorporationInventor: Kevin B. Judd
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Patent number: 9424869Abstract: Controlling the position of a head within a tape transport system. A track-follow control system (TFCS) includes a controller device for generating a control signal as a function of a position error signal (PES), wherein the PES indicates a difference between the actual and target positions of the head relative to the tape, and an actuator for changing the actual position. The TFCS is adapted to select a controller device configuration from a plurality of configurations dependent on an operating tape speed. The configurations are predetermined depending on a vibration frequency domain profile indicative of environmental vibrations induced to the head and tape to determine the control signal for adjusting an actuator output signal relative to a lateral tape motion signal. The TFCS is also adapted to feed-back a signal depending on a difference of the actuator output signal and the lateral tape motion signal to generate the PES.Type: GrantFiled: July 17, 2015Date of Patent: August 23, 2016Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Armando J. Argumedo, Nhan X. Bui, David H. Harper, Randy C. Inch, Kevin B. Judd, Mark A. Lantz, Angeliki Pantazi, Tomoko Taketomi
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Publication number: 20160196846Abstract: A computer-implemented method includes: determining a reading performance of a head positioned at a commanded lateral reading location based on one or more metrics; adjusting a lateral reading location of the head relative to a medium by moving the head in a lateral direction away from the commanded lateral reading location to an adjusted lateral reading location; determining a reading performance of the head after the adjusting; comparing the reading performance after the adjusting to the reading performance before the adjusting for determining whether the reading performance has improved; and selecting an optimal lateral reading location based on the comparing. The one or more metrics are selected from a group consisting of C1 error correction rate, and C2 error correction rate. Corresponding systems and computer program products are also disclosed.Type: ApplicationFiled: March 11, 2016Publication date: July 7, 2016Inventors: Ernest S. Gale, Randy C. Inch, Kevin B. Judd, David L. Swanson
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Patent number: 9373346Abstract: An apparatus, according to one embodiment, includes a magnetic head having a plurality of servo writer elements, and an actuator, the actuator being sandwiched between first and second servo writer elements of the plurality of servo writer elements. The actuator is also configured to actively adjust a distance between the first and second servo writer elements. Other systems, methods, and computer program products are described in additional embodiments.Type: GrantFiled: June 27, 2015Date of Patent: June 21, 2016Assignee: International Business Machines CorporationInventors: Nhan X. Bui, Edwin R. Childers, Kevin B. Judd
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Patent number: 9361928Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.Type: GrantFiled: December 7, 2015Date of Patent: June 7, 2016Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Nhan X. Bui, Kevin B. Judd, Roger J. Justo, Hirokazu Nakayama, Tomoko Taketomi
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Patent number: 9299374Abstract: In one embodiment, a method includes determining a reading performance based on one or more metrics, adjusting a commanded lateral reading location of a head relative to a medium, determining the reading performance after the adjusting, comparing the reading performance after the adjusting relative to the reading performance before the adjusting for determining whether the reading performance has improved, and selecting a commanded lateral reading location based on the comparing. In another embodiment, a controller is configured to perform the foregoing method. In yet another embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith, the program instructions readable and/or executable by a controller configured to perform the foregoing method.Type: GrantFiled: July 15, 2014Date of Patent: March 29, 2016Assignee: International Business Machines CorporationInventors: Ernest S. Gale, Randy C. Inch, Kevin B. Judd, David L. Swanson
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Publication number: 20160086629Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.Type: ApplicationFiled: December 7, 2015Publication date: March 24, 2016Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Nhan X. BUI, Kevin B. JUDD, Roger J. JUSTO, Hirokazu NAKAYAMA, Tomoko TAKETOMI
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Patent number: 9263065Abstract: In one embodiment, a method includes determining a stopwrite threshold based on a standard deviation or a variance at a current position error signal sample, and determining whether the current position error signal sample exceeds the stopwrite threshold. Writing is disabled in response to determining that the current position error signal sample exceeds the stopwrite threshold. Writing is enabled in response to determining that the current position error signal sample does not exceed the stopwrite threshold.Type: GrantFiled: December 8, 2014Date of Patent: February 16, 2016Assignee: International Business Machines CorporationInventors: Nhan X. Bui, Kevin B. Judd, Tomoko Taketomi
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Patent number: 9251840Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.Type: GrantFiled: October 3, 2014Date of Patent: February 2, 2016Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Nhan X. Bui, Kevin B. Judd, Roger J. Justo, Hirokazu Nakayama, Tomoko Taketomi
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Publication number: 20160019919Abstract: In one embodiment, a method includes determining a reading performance based on one or more metrics, adjusting a commanded lateral reading location of a head relative to a medium, determining the reading performance after the adjusting, comparing the reading performance after the adjusting relative to the reading performance before the adjusting for determining whether the reading performance has improved, and selecting a commanded lateral reading location based on the comparing. In another embodiment, a controller is configured to perform the foregoing method. In yet another embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith, the program instructions readable and/or executable by a controller configured to perform the foregoing method.Type: ApplicationFiled: July 15, 2014Publication date: January 21, 2016Inventors: Ernest S. Gale, Randy C. Inch, Kevin B. Judd, David L. Swanson
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Publication number: 20150325262Abstract: Controlling the position of a head within a tape transport system. A track-follow control system (TFCS) includes a controller device for generating a control signal as a function of a position error signal (PES), wherein the PES indicates a difference between the actual and target positions of the head relative to the tape, and an actuator for changing the actual position. The TFCS is adapted to select a controller device configuration from a plurality of configurations dependent on an operating tape speed. The configurations are predetermined depending on a vibration frequency domain profile indicative of environmental vibrations induced to the head and tape to determine the control signal for adjusting an actuator output signal relative to a lateral tape motion signal. The TFCS is also adapted to feed-back a signal depending on a difference of the actuator output signal and the lateral tape motion signal to generate the PES.Type: ApplicationFiled: July 17, 2015Publication date: November 12, 2015Inventors: ARMANDO J. ARGUMEDO, NHAN X. BUI, DAVID H. HARPER, RANDY C. INCH, KEVIN B. JUDD, MARK A. LANTZ, ANGELIKl PANTAZI, TOMOKO TAKETOMI
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Adjusting tension in a tape media to counter tape dimensional stability (TDS) errors in a tape media
Patent number: 9153280Abstract: Provided are a method, system, and program for adjusting tension in a tape media to counter tape dimensional stability (TDS) errors in a tape media. A determination is made of whether to adjust tension of the tape media based on a detected error rate of reading at least one of the tracks. The tension of the tape media is adjusted in response to determining to adjust the tension.Type: GrantFiled: January 15, 2015Date of Patent: October 6, 2015Assignee: GLOBALFOUNDRIES, INC.Inventors: Nhan X. Bui, Reed A. Hancock, Kevin B. Judd -
Publication number: 20150262611Abstract: A method according to one embodiment includes determining whether a current position error signal sample exceeds a stopwrite threshold, disabling writing in response to determining that the current position error signal sample exceeds the stopwrite threshold, and enabling writing in response to determining that the current position error signal sample does not exceed the stopwrite threshold.Type: ApplicationFiled: June 1, 2015Publication date: September 17, 2015Inventor: Kevin B. Judd
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Publication number: 20150255112Abstract: In one embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith, the program instructions readable/executable by a controller to cause the controller to: determine and/or receive, by the controller, a selection of which of at least two track width formats to use during writing of data on a magnetic recording tape, wherein the track width format is selected based on an environmental condition; and cause, by the controller, simultaneous writing of a plurality of data tracks to the magnetic recording tape using only one of the track width formats at a same time such that each of the data tracks written at the same time has a track width that is substantially the same.Type: ApplicationFiled: May 21, 2015Publication date: September 10, 2015Inventors: Randy C. Inch, Kevin B. Judd
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Publication number: 20150243317Abstract: A maximum velocity is dynamically determined during a tape drive operation to obtain a statistical standard deviation of a position error signal (PES) that yields an amount of stopwrite (SW) operations that avoids backhitching. The tape velocity is adjusted to the maximum velocity.Type: ApplicationFiled: October 3, 2014Publication date: August 27, 2015Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Nhan X. BUI, Kevin B. JUDD, Roger J. JUSTO, Hirokazu NAKAYAMA, Tomoko TAKETOMI
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Patent number: 9087539Abstract: Controlling the position of a head within a tape transport system. A track-follow control system (TFCS) includes a controller device for generating a control signal as a function of a position error signal (PES), wherein the PES indicates a difference between the actual and target positions of the head relative to the tape, and an actuator for changing the actual position. The TFCS is adapted to select a controller device configuration from a plurality of configurations dependent on an operating tape speed. The configurations are predetermined depending on a vibration frequency domain profile indicative of environmental vibrations induced to the head and tape to determine the control signal for adjusting an actuator output signal relative to a lateral tape motion signal. The TFCS is also adapted to feed-back a signal depending on a difference of the actuator output signal and the lateral tape motion signal to generate the PES.Type: GrantFiled: June 26, 2014Date of Patent: July 21, 2015Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Armando J Argumedo, Nhan X Bui, David H Harper, Randy C Inch, Kevin B Judd, Mark A Lantz, Angeliki Pantazi, Tomoko Taketomi