Patents by Inventor Thomas O. Melrose
Thomas O. Melrose 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: 7889453Abstract: Various embodiments of the present invention are generally directed to adaptively determining an updated repeated runout (RRO) correction value to correct for RRO error in the placement of a servo seam, by iteratively combining a weighted initially estimated RRO correction value for the seam with a position error signal (PES).Type: GrantFiled: November 14, 2007Date of Patent: February 15, 2011Assignee: Seagate Technology LLCInventor: Thomas O. Melrose
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Patent number: 7782003Abstract: Apparatus and method for compensating for positional indicia misplacements in the positioning of a control object, such as with servo seam misplacements on a data storage device storage medium. An actual position for the control object is determined in relation to a corrected commanded position of the control object and a corrected position error of the control object. The corrected commanded position is determined in relation to a gain error and an actual commanded position, and the corrected position error determined in relation to the gain error and an actual position error. Preferably, an actual position error of the control object is next determined in relation to the actual position, and the control object is moved to reduce the actual position error. The positional indicia preferably comprise AB and CD seams of ABCD servo dibit patterns on a recording surface.Type: GrantFiled: November 3, 2006Date of Patent: August 24, 2010Assignee: Seagate Technology LLCInventor: Thomas O. Melrose
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Patent number: 7561370Abstract: Various embodiments of the present invention are generally directed to propagating repeated runout (RRO) correction values for radially concentric servo seams on a storage medium in relation to an RRO correction value for an adjacent seam and a radial separation between the seams.Type: GrantFiled: August 28, 2007Date of Patent: July 14, 2009Assignee: Seagate Technology LLCInventors: Thomas O. Melrose, Bruce Liikanen, John C. Purkett
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Patent number: 7542230Abstract: A disk drive self-servo writes on a storage disk. Servo bursts are self-written along a track using a transducer, a position error signal (PES) indicating repeatable runout due (RRO) for the servo bursts is determined using a reference pattern, an embedded runout correction (ERC) value is calculated based on the PES and stored in a corresponding servo sector, and then the disk drive self-writes other servo bursts.Type: GrantFiled: May 6, 2006Date of Patent: June 2, 2009Assignee: Maxtor CorporationInventors: Thomas O. Melrose, James W. Hargarten
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Publication number: 20090122440Abstract: Various embodiments of the present invention are generally directed to adaptively determining an updated repeated runout (RRO) correction value to correct for RRO error in the placement of a servo seam, by iteratively combining a weighted initially estimated RRO correction value for the seam with a position error signal (PES).Type: ApplicationFiled: November 14, 2007Publication date: May 14, 2009Applicant: Seagate Technology LLCInventor: Thomas O. Melrose
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Patent number: 7525754Abstract: In accordance with various embodiments, a radial separation distance between first and second servo seams on a storage medium is determined, and a scaled position signal is generated in relation to the determined radial separation distance and a measured position signal. An error runout correction (ERC) value is obtained from the scaled position signal, and the ERC value is thereafter used to compensate for repeated runout (RRO) error.Type: GrantFiled: June 26, 2007Date of Patent: April 28, 2009Assignee: Seagate Technology LLCInventors: Thomas O. Melrose, Bruce Liikanen
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Publication number: 20090059420Abstract: Various embodiments of the present invention are generally directed to propagating repeated runout (RRO) correction values for radially concentric servo seams on a storage medium in relation to an RRO correction value for an adjacent seam and a radial separation between the seams.Type: ApplicationFiled: August 28, 2007Publication date: March 5, 2009Applicant: Seagate Technology LLCInventors: THOMAS O. MELROSE, Bruce Liikanen, John C. Purkett
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Patent number: 7489469Abstract: Performing embedded runout correction for a track on a rotational data storage disk includes measuring written-in runout for the track, selecting a number of revolutions in response to the measured written-in runout of the track, calculating embedded correction values for the track for the selected number of revolutions of the rotational data storage disk, and storing the embedded correction values.Type: GrantFiled: March 15, 2007Date of Patent: February 10, 2009Assignee: Seagate Technology LLCInventors: Yu Sun, Don Brunnett, Lloyd Levy, Thomas O. Melrose
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Patent number: 7474491Abstract: An apparatus and associated method is provided for observing a positional misplacement of a control object at a first commanded position, defining a fault threshold as a function of the observed positional misplacement, and signaling a write unsafe command to the control object in relation to comparing an instantaneous positional misplacement of the control object to the defined fault threshold during self servo writing with the control object.Type: GrantFiled: December 11, 2006Date of Patent: January 6, 2009Assignee: Maxtor CorporationInventors: Bruce Liikanen, Thomas O. Melrose
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Publication number: 20090002874Abstract: In accordance with various embodiments, a radial separation distance between first and second servo seams on a storage medium is determined, and a scaled position signal is generated in relation to the determined radial separation distance and a measured position signal. An error runout correction (ERC) value is obtained from the scaled position signal, and the ERC value is thereafter used to compensate for repeated runout (RRO) error.Type: ApplicationFiled: June 26, 2007Publication date: January 1, 2009Applicant: Seagate Technology LLCInventors: THOMAS O. MELROSE, Bruce Liikanen
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Patent number: 7271977Abstract: A method of reducing microjog errors in a disk drive having a data recording disk with data tracks and a transducer head positionable on the tracks. The head includes a writer element offset from a reader element. To reduce microjog errors, track squeeze is measured at a number of locations across the surface, wherein the squeeze is due to mis-positioning of the track relative to neighboring tracks. A microjog distance for the destination track is provided, and a microjog correction value based on the measured track squeeze is calculated. The correction value is applied to the microjog distance to obtain a corrected microjog distance that reduces microjog errors due to track squeeze.Type: GrantFiled: February 11, 2004Date of Patent: September 18, 2007Assignee: Maxtor CorporationInventors: Thomas O. Melrose, Timothy J. Everett
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Patent number: 7123433Abstract: A disk drive self-servo writes on a storage disk. Servo bursts are self-written along a track using a transducer, a position error signal (PES) indicating repeatable runout due (RRO) for the servo bursts is determined using a reference pattern, an embedded runout correction (ERC) value is calculated based on the PES and stored in a corresponding servo sector, and then the disk drive self-writes other servo bursts.Type: GrantFiled: August 14, 2003Date of Patent: October 17, 2006Assignee: Maxtor CorporationInventors: Thomas O. Melrose, James W. Hargarten
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Patent number: 6977792Abstract: A method and system for self-writing track locations of a data disk in a disk drive in order to reduce overall track runout are disclosed. First set of servo bursts are self-written along a track via a transducer, and repeatable runout correction values for the first servo bursts are calculated. Then, second servo bursts are self-written along the track via the transducer such that the first and second servo bursts form a plurality of servo sector patterns that define the track centerline, wherein the second servo bursts are positioned using said correction values to essentially compensate for the runout in the first servo bursts and reduce the overall track runout.Type: GrantFiled: July 10, 2003Date of Patent: December 20, 2005Assignee: Maxtor CorporationInventors: Thomas O. Melrose, James W. Hargarten, Bruce A. Liikanen
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Patent number: 5062133Abstract: The multi-function telephone call management system enables a user to recursively activate a plurality of voice communication features on a single call connection. The multi-function telephone call management system serves to interconnect a plurality of communication devices with a single incoming telephone line. The apparatus and features provided by this multi-function telephone call management system include connection to a modem, facsimile machine, or answering machine and call forwarding, call screening, call notification and distinctive ringing services. All of the above features are provided by the multi-function telephone call management system on a single call connection by the use of the recursive feature contained therein. This recursive feature enables a caller to sequence through the various call features provided by this apparatus on a single call connection. The sequence and selection of call options are completely under control of the caller.Type: GrantFiled: July 7, 1989Date of Patent: October 29, 1991Assignee: Logotronix IncorporatedInventor: Thomas O. Melrose