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: 9070407Abstract: A data storage system according to one embodiment includes a head, a drive mechanism for passing a medium over the head, a controller electrically coupled to the head, and logic integrated with and/or executable by the controller. The logic is configured to: update a first value based on a current position error signal sample, determine whether the first value exceeds a predetermined threshold, determine a stopwrite threshold based on the first value when the first value exceeds the predetermined threshold, determine whether the current position error signal sample exceeds the stopwrite threshold, disable writing when the current position error signal sample exceeds the stopwrite threshold, and enable writing when the current position error signal sample does not exceed the stopwrite threshold.Type: GrantFiled: April 18, 2014Date of Patent: June 30, 2015Assignee: International Business Machines CorporationInventor: Kevin B. Judd
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Patent number: 9047879Abstract: A data storage system according to one embodiment includes a magnetic head, a drive mechanism for passing a magnetic medium over the magnetic head, and a controller electrically coupled to the magnetic head. The data storage system is configured to use at least two different track width formats, where which of the at least two different track width formats used by the system during reading and/or writing of data is selectable. A magnetic tape-based data storage system according to another embodiment includes a magnetic head; a drive mechanism for passing a magnetic recording tape over the magnetic head; and a controller electrically coupled to the magnetic head, wherein the system is configured to use at least two different track width formats, wherein which of the at least two different track width formats used by the system during reading and/or writing of data is selectable.Type: GrantFiled: February 26, 2013Date of Patent: June 2, 2015Assignee: International Business Machines CorporationInventors: Randy C. Inch, Kevin B. Judd
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Patent number: 9042046Abstract: A method according to one embodiment includes measuring a current position error signal, and calculating a statistical derivative using the current position error signal sample. A kurtosis value is calculated using a current position error signal sample or derivative thereof. A threshold value is adjusted using the kurtosis value. The statistical derivative is compared to the threshold value, and writing is enabled when the statistical derivative does not exceed the threshold value. A determination is made whether to enable or disable writing based on a stopwrite threshold when the statistical derivative exceeds the threshold value.Type: GrantFiled: June 17, 2014Date of Patent: May 26, 2015Assignee: International Business Machines CorporationInventors: Randy C. Inch, Kevin B. Judd
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ADJUSTING TENSION IN A TAPE MEDIA TO COUNTER TAPE DIMENSIONAL STABILITY (TDS) ERRORS IN A TAPE MEDIA
Publication number: 20150124348Abstract: 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: ApplicationFiled: January 15, 2015Publication date: May 7, 2015Inventors: Nhan X. Bui, Reed A. Hancock, Kevin B. Judd -
Publication number: 20150092293Abstract: 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: ApplicationFiled: December 8, 2014Publication date: April 2, 2015Inventors: Nhan X. Bui, Kevin B. Judd, 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: 8982492Abstract: 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: May 3, 2013Date of Patent: March 17, 2015Assignee: International Business Machines CorporationInventors: Nhan X. Bui, Reed A. Hancock, Kevin B. Judd -
Patent number: 8937777Abstract: In one embodiment, a method includes updating a standard deviation or a variance based on a current position error signal sample, where a smoothing factor applied to a subsequent calculation of the standard deviation or variance is dynamically altered based at least in part on whether a current value of the standard deviation or the variance is above or below a specified value. A determination is made as to whether the standard deviation or the variance exceeds a predetermined threshold. A stopwrite threshold is determined based on the standard deviation or the variance when the standard deviation or the variance exceeds the predetermined threshold. A determination is made as to whether the current position error signal sample exceeds the stopwrite threshold. Writing is disabled when the current position error signal sample exceeds the stopwrite threshold. Writing is enabled when the current position error signal sample does not exceed the stopwrite threshold.Type: GrantFiled: March 27, 2014Date of Patent: January 20, 2015Assignee: International Business Machines CorporationInventors: Nhan X. Bui, Kevin B. Judd, Tomoko Taketomi
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Publication number: 20150009590Abstract: 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: June 26, 2014Publication date: January 8, 2015Inventors: 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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Patent number: 8891197Abstract: A determination is made in a tape drive of a potential deviation in tape dimensional stability of a tape, based on a current environmental condition and environmental conditions in which the tape is expected to be operational. A writing mechanism to write data to the tape is adjusted, based on the potential deviation in the tape dimensional stability.Type: GrantFiled: February 26, 2013Date of Patent: November 18, 2014Assignee: International Business Machines CorporationInventors: Reed A. Hancock, Kevin B. Judd
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Publication number: 20140293470Abstract: A method according to one embodiment includes measuring a current position error signal, and calculating a statistical derivative using the current position error signal sample. A kurtosis value is calculated using a current position error signal sample or derivative thereof. A threshold value is adjusted using the kurtosis value. The statistical derivative is compared to the threshold value, and writing is enabled when the statistical derivative does not exceed the threshold value.Type: ApplicationFiled: June 17, 2014Publication date: October 2, 2014Inventors: Randy C. Inch, Kevin B. Judd
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Publication number: 20140240868Abstract: A data storage system according to one embodiment includes a magnetic head, a drive mechanism for passing a magnetic medium over the magnetic head, and a controller electrically coupled to the magnetic head. The data storage system is configured to use at least two different track width formats, where which of the at least two different track width formats used by the system during reading and/or writing of data is selectable. A magnetic tape-based data storage system according to another embodiment includes a magnetic head; a drive mechanism for passing a magnetic recording tape over the magnetic head; and a controller electrically coupled to the magnetic head, wherein the system is configured to use at least two different track width formats, wherein which of the at least two different track width formats used by the system during reading and/or writing of data is selectable.Type: ApplicationFiled: February 26, 2013Publication date: August 28, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Randy C. Inch, Kevin B. Judd
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Publication number: 20140240866Abstract: A determination is made in a tape drive of a potential deviation in tape dimensional stability of a tape, based on a current environmental condition and environmental conditions in which the tape is expected to be operational. A writing mechanism to write data to the tape is adjusted, based on the potential deviation in the tape dimensional stability.Type: ApplicationFiled: February 26, 2013Publication date: August 28, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Reed A. Hancock, Kevin B. Judd
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Patent number: 8810939Abstract: A data storage system according to one embodiment includes a head; a drive mechanism for passing a medium over the head; and a controller electrically coupled to the head. The system calculates a kurtosis value, using the current position error signal sample or derivative thereof, and adjusts a threshold value using the kurtosis value. The standard deviation or variance is compared to the threshold value, and writing is enabled when the standard deviation or variance does not exceed the threshold value.Type: GrantFiled: August 28, 2012Date of Patent: August 19, 2014Assignee: International Business Machines CorporationInventors: Randy C. Inch, Kevin B. Judd
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Publication number: 20140226228Abstract: A data storage system according to one embodiment includes a head, a drive mechanism for passing a medium over the head, a controller electrically coupled to the head, and logic integrated with and/or executable by the controller. The logic is configured to: update a first value based on a current position error signal sample, determine whether the first value exceeds a predetermined threshold, determine a stopwrite threshold based on the first value when the first value exceeds the predetermined threshold, determine whether the current position error signal sample exceeds the stopwrite threshold, disable writing when the current position error signal sample exceeds the stopwrite threshold, and enable writing when the current position error signal sample does not exceed the stopwrite threshold.Type: ApplicationFiled: April 18, 2014Publication date: August 14, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventor: Kevin B. Judd
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Patent number: 8804257Abstract: A method according to one embodiment includes measuring a current position error signal; calculating a standard deviation or a variance using the current position error signal sample; calculating a kurtosis value, using the current position error signal sample or derivative thereof; adjusting a threshold value using the kurtosis value; comparing the standard deviation or variance to the threshold value; enabling writing when the standard deviation or variance does not exceed the threshold value.Type: GrantFiled: October 31, 2013Date of Patent: August 12, 2014Assignee: International Business Machines CorporationInventors: Randy C. Inch, Kevin B. Judd
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Publication number: 20140211335Abstract: In one embodiment, a method includes updating a standard deviation or a variance based on a current position error signal sample, where a smoothing factor applied to a subsequent calculation of the standard deviation or variance is dynamically altered based at least in part on whether a current value of the standard deviation or the variance is above or below a specified value. A determination is made as to whether the standard deviation or the variance exceeds a predetermined threshold. A stopwrite threshold is determined based on the standard deviation or the variance when the standard deviation or the variance exceeds the predetermined threshold. A determination is made as to whether the current position error signal sample exceeds the stopwrite threshold. Writing is disabled when the current position error signal sample exceeds the stopwrite threshold. Writing is enabled when the current position error signal sample does not exceed the stopwrite threshold.Type: ApplicationFiled: March 27, 2014Publication date: July 31, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Nhan X. Bui, Kevin B. Judd, Tomoko Taketomi
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Patent number: 8773805Abstract: Tape media life is increased by dynamically controlling a turn around point (TAP) on the tape media for either an end of a tape wrap or a directional change from a first longitudinal position tape section to a second longitudinal position tape section for reducing damage to the tape media caused by debris by monitoring the TAP for all tape media motion and adjusting tape deceleration for maintaining the TAP to be located at the second longitudinal position tape section.Type: GrantFiled: August 31, 2012Date of Patent: July 8, 2014Assignee: International Business Machines CorporationInventors: Armando Jesus Argumedo, Ernest Stewart Gale, Reed Alan Hancock, Kevin B. Judd, Eiji Ogura
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Patent number: 8743492Abstract: In one embodiment, a data storage system includes a head; a drive mechanism for passing a medium over the head; a controller electrically coupled to the head; logic encoded in or available to the controller for: periodically determining a stopwrite threshold based on a standard deviation or a variance at a current position error signal sample, wherein a smoothing factor applied to a subsequent calculation of the standard deviation or variance is altered based at least in part on a current magnitude of the standard deviation or the variance; determining whether the current position error signal sample exceeds the stopwrite threshold; disabling writing when the current position error signal sample exceeds the stopwrite threshold; and enabling writing when the current position error signal sample does not exceed the stopwrite threshold. Other systems, methods, and computer program products are described according to more embodiments.Type: GrantFiled: July 20, 2012Date of Patent: June 3, 2014Assignee: International Business Machines CorporationInventors: Nhan X. Bui, Kevin B. Judd, Tomoko Taketomi
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Patent number: 8743491Abstract: A data storage system according to one embodiment includes a head; a drive mechanism for passing a medium over the head; a controller electrically coupled to the head; logic for periodically determining a stopwrite threshold based on a current position error signal sample; logic for determining whether the current position error signal sample exceeds the stopwrite threshold; logic for disabling writing when the current position error signal sample exceeds the stopwrite threshold; and logic for enabling writing when the current position error signal sample does not exceed the stopwrite threshold. Additional embodiments are also disclosed.Type: GrantFiled: April 5, 2012Date of Patent: June 3, 2014Assignee: International Business Machines CorporationInventor: Kevin B. Judd
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Publication number: 20140063635Abstract: A data storage system according to one embodiment includes a head; a drive mechanism for passing a medium over the head; and a controller electrically coupled to the head. The system calculates a kurtosis value, using the current position error signal sample or derivative thereof, and adjusts a threshold value using the kurtosis value. The standard deviation or variance is compared to the threshold value, and writing is enabled when the standard deviation or variance does not exceed the threshold value.Type: ApplicationFiled: August 28, 2012Publication date: March 6, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Randy C. Inch, Kevin B. Judd