Patents by Inventor James E. Angelo
James E. Angelo 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: 10971177Abstract: A first heat-assisted magnetic recording (HAMR) writer writes to a surface of a magnetic disk using during an initial time period. A second HAMR writer is configured to write to the surface but not during the initial time period. The initial time period extends from a first time when the disk drive is first used to a second time when a near-field transducer of the first HAMR writer reaches a first wear threshold. During a subsequent time period after the initial time period, to the surface of the disk is written to using the second HAMR writer and not the first HAMR writer.Type: GrantFiled: May 29, 2020Date of Patent: April 6, 2021Assignee: Seagate Technology LLCInventors: James E. Angelo, Mehmet Fatih Erden, John W. Dykes
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Publication number: 20190287554Abstract: A temperature compensation equation is generated during manufacture of a heat-assisted magnetic recording (HAMR) disk drive using initial total currents supplied to a laser diode of the disk drive at different initial operating temperatures. The total currents represent currents for recording data to or erasing data from the medium. The temperature compensation equation is stored in the disk drive, and updated, during field operation, using a subsequent total current associated with an operating temperature differing from the initial operating temperatures. The total current supplied to the laser diode for a subsequent write operation is adjusted using the updated temperature compensation equation in response to the operating temperature at the time of the subsequent write operation.Type: ApplicationFiled: October 25, 2018Publication date: September 19, 2019Inventors: Alfredo Sam Chu, Franklin P. Martens, Drew Michael Mader, Steven J. Kimble, James E. Angelo
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Patent number: 10395673Abstract: A temperature compensation equation is generated during manufacture of a heat-assisted magnetic recording (HAMR) disk drive using initial total currents supplied to a laser diode of the disk drive at different initial operating temperatures. The total currents represent currents for recording data to or erasing data from the medium. The temperature compensation equation is stored in the disk drive, and updated, during field operation, using a subsequent total current associated with an operating temperature differing from the initial operating temperatures. The total current supplied to the laser diode for a subsequent write operation is adjusted using the updated temperature compensation equation in response to the operating temperature at the time of the subsequent write operation.Type: GrantFiled: October 25, 2018Date of Patent: August 27, 2019Assignee: Seagate Technology LLCInventors: Alfredo Sam Chu, Franklin P. Martens, Drew Michael Mader, Steven J. Kimble, James E. Angelo
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Patent number: 10127930Abstract: A temperature compensation equation is generated during manufacture of a heat-assisted magnetic recording (HAMR) disk drive using initial total currents supplied to a laser diode of the disk drive at different initial operating temperatures. The total currents represent currents for recording data to or erasing data from the medium. The temperature compensation equation is stored in the disk drive, and updated, during field operation, using a subsequent total current associated with an operating temperature differing from the initial operating temperatures. The total current supplied to the laser diode for a subsequent write operation is adjusted using the updated temperature compensation equation in response to the operating temperature at the time of the subsequent write operation.Type: GrantFiled: March 13, 2018Date of Patent: November 13, 2018Assignee: Seagate Technology LLCInventors: Alfredo Sam Chu, Franklin P. Martens, Drew Michael Mader, Steven J. Kimble, James E. Angelo
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Patent number: 9916849Abstract: An optical power level applied via a laser when recording data to a track of a heat-assisted recording medium is determined. In response to the optical power level being too low or too high, remedial action is taken to prevent loss of data on one or more of the track and an adjacent track.Type: GrantFiled: November 9, 2016Date of Patent: March 13, 2018Assignee: SEAGATE TECHNOLOGY LLCInventors: Drew Michael Mader, Tim Rausch, James E. Angelo
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Patent number: 9842621Abstract: An apparatus determines that phase errors have exceeded a threshold when reading data previously recorded to a heat-assisted recording medium. In response to the phase errors exceeding the threshold, remedial action is taken to prevent loss of data due changes in power applied to heat the heat-assisted recording medium when recording.Type: GrantFiled: August 25, 2016Date of Patent: December 12, 2017Assignee: SEAGATE TECHNOLOGY LLCInventors: Drew Michael Mader, Tim Rausch, James E. Angelo
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Publication number: 20140078612Abstract: In certain embodiments, a method includes calculating a mixing ratio of air internal to a disk drive. In response to the calculated mixing ratio, a head-to-media spacing is adjusted. In certain embodiments, a system includes a controller that adjusts head-to-media spacing in response to a calculated mixing ratio of air internal to a disk drive.Type: ApplicationFiled: September 14, 2012Publication date: March 20, 2014Inventors: Neal F. Gunderson, Lawrence A. Wilcox, Richard A. Herr, Scott E. Ryun, Yufeng Li, James E. Angelo
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Patent number: 8023215Abstract: A method is provided that decides whether a region of data storage units in a data storage system should be scanned for defective data. A current region of data storage units affected by a write operation is determined and which select transducing head of the data storage system that corresponds with the current region is also determined. A scalar value that corresponds with the select transducing head is retrieved. The scalar value related to a condition of the select transducing head based on previously conducted performance tests. An incremented write count of the affected region is scaled by the scalar value to obtain a new increment write count. A defective data scan is performed on the affected region if the new increment write count exceeds a default write count threshold.Type: GrantFiled: May 25, 2010Date of Patent: September 20, 2011Assignee: Seagate Technology LLCInventors: Mai A. Ghaly, James E. Angelo, Akhila Tadinada, Paul J. Choquette, Kenneth R. Burns, Kevin M. Bailey
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Patent number: 7411752Abstract: A disc drive including a transducer supported on the head suspension assembly to induce a transducer signal in response to head vibration. The transducer signal is level detected to output a level detected signal indicative of head vibration. A method for detecting head vibration via a transducer on a head suspension assembly. The transducer on the head suspension assembly operating between a detection mode and an actuator mode for selectively detecting vibration and actuating the head.Type: GrantFiled: December 22, 1999Date of Patent: August 12, 2008Assignee: Seagate Technology LLCInventors: James E. Angelo, John S. Wright
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Patent number: 6743481Abstract: A multilayer coating of fullerene molecules is deposited on a substrate, and layers of the multilayer coating are removed leaving an approximate monolayer coating of fullerene molecules on the substrate. In some embodiments, a beam generator, such as an ion beam, electron beam or laser generator, produces a beam arranged to break the weaker fullerene-to-fullerene intermolecular bond of the multilayer coating and inadequate to break the stronger fullerene-to-substrate association/bond of the coating. The beam is directed at the multilayer coating to break the fullerene-to-fullerene intermolecular bond. In other embodiments, the monolayer of fullerene molecules is formed by applying a solvent to the multilayer coating to break the fullerene-to-fullerene intermolecular bond of the multilayer coating.Type: GrantFiled: May 31, 2001Date of Patent: June 1, 2004Assignee: Seagate Technology LLCInventors: Joel W. Hoehn, John W. Dykes, James E. Angelo, William D. Mosley, Richard T. Greenlee, Brian W. Karr
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Patent number: 6586069Abstract: An improved magnetic medium has a metal or semiconductor surface in which the surface of the magnetic medium has an approximate monolayer of fullerene molecules bonded to the metal or semiconductor surface. The bond strength between the fullerene molecules and the surface is stronger than the fullerene-fullerene intermolecular bond strength. The magnetic media can be used in the production of components for data storage system, in particular heads with magnetic transducers and magnetic or optical-magnetic discs. In methods for forming the fullerene coatings, an approximate monolayer of fullerene molecules are deposited on a metal or semiconductor surface substantially free of contaminants.Type: GrantFiled: April 13, 2001Date of Patent: July 1, 2003Assignee: Seagate Technology LLCInventors: John W. Dykes, Joel W. Hoehn, James E. Angelo, William D. Mosley
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Patent number: 6568992Abstract: A method for lapping a magnetic read/write element on a slider having a shear based transducer is disclosed. The shear based transducer is used during the fabrication process to more precisely lap the MR element. The method comprises measuring the stripe height of the MR element and actuating the shear based transducer to move the MR element to a desired position relative to a lapping apparatus. The MR element is then lapped to achieve a desired stripe height.Type: GrantFiled: April 6, 2001Date of Patent: May 27, 2003Assignee: Seagate Technology, LLC.Inventors: James E. Angelo, Zine-Eddine Boutaghou
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Publication number: 20030011914Abstract: A disc drive including a transducer supported on the head suspension assembly to induce a transducer signal in response to head vibration. The transducer signal is level detected to output a level detected signal indicative of head vibration. A method for detecting head vibration via a transducer on a head suspension assembly. The transducer on the head suspension assembly operating between a detection mode and an actuator mode for selectively detecting vibration and actuating the head.Type: ApplicationFiled: December 22, 1999Publication date: January 16, 2003Inventors: JAMES E. ANGELO, JOHN S. WRIGHT
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Patent number: 6479111Abstract: A target of fullerene is placed with a substrate in a vacuum chamber. A charged beam, i.e., an electron beam or an ion beam, is directed at the target with a power adequate to emit fullerene molecules from the target and not high enough to form significant amounts of fullerene having a higher molecular structure than the target fullerenes. Fullerene is deposited on the substrate. Regardless of the approach used to deposit the fullerenes, the substrate can be heated during deposition to a temperature above the fullerene-to-fullerene disorption temperature to form a coating consisting of an approximate monolayer of fullerene.Type: GrantFiled: May 31, 2001Date of Patent: November 12, 2002Assignee: Seagate Technology LLCInventors: John W. Dykes, Joel W. Hoehn, James E. Angelo, William D. Mosley
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Patent number: 6459547Abstract: A disc storage system includes a rotating disc and a transducer. The transducer is carried on a slider which is supported by an armature. The armature is used to move the slider radially across the disc surface whereby information may be read from or written to the disc surface of the transducer. The slider includes an air bearing surface which faces the disc surface. As the disc rotates, the air bearing surface causes the slider to “fly” over the disc surface. Pads are provided on the air bearing surface to improve operational characteristics of the system and texturing is provided to a landing zone region on the disc surface.Type: GrantFiled: May 4, 2000Date of Patent: October 1, 2002Assignee: Seagate Technology LLCInventors: Jason W. Riddering, Zine-Eddine Boutaghou, Jing Gui, Huan Tang, Mukund C. Rao, James E. Angelo, Joshua C. Harrison, James M. Murphy
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Publication number: 20020031615Abstract: A target of fullerene is placed with a substrate in a vacuum chamber. A charged beam, i.e., an electron beam or an ion beam, is directed at the target with a power adequate to emit fullerene molecules from the target and not high enough to form significant amounts of fullerene having a higher molecular structure than the target fullerenes. Fullerene is deposited on the substrate. Regardless of the approach used to deposit the fullerenes, the substrate can be heated during deposition to a temperature above the fullerene-to-fullerene disorption temperature to form a coating consisting of an approximate monolayer of fullerene.Type: ApplicationFiled: May 31, 2001Publication date: March 14, 2002Inventors: John W. Dykes, Joel W. Hoehn, James E. Angelo, William D. Mosley
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Publication number: 20020001680Abstract: A multilayer coating of fullerene molecules is deposited on a substrate, and layers of the multilayer coating are removed leaving an approximate monolayer coating of fullerene molecules on the substrate. In some embodiments, a beam generator, such as an ion beam, electron beam or laser generator, produces a beam arranged to break the weaker fullerene-to-fullerene intermolecular bond of the multilayer coating and inadequate to break the stronger fullerene-to-substrate association/bond of the coating. The beam is directed at the multilayer coating to break the fullerene-to-fullerene intermolecular bond. In other embodiments, the monolayer of fullerene molecules is formed by applying a solvent to the multilayer coating to break the fullerene-to-fullerene intermolecular bond of the multilayer coating.Type: ApplicationFiled: May 31, 2001Publication date: January 3, 2002Inventors: Joel W. Hoehn, John W. Dykes, James E. Angelo, William D. Mosley, Richard T. Greenlee, Brian W. Karr
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Publication number: 20010055700Abstract: An improved magnetic medium has a metal or semiconductor surface in which the surface of the magnetic medium has an approximate monolayer of fullerene molecules bonded to the metal or semiconductor surface. The bond strength between the fullerene molecules and the surface is stronger than the fullerene-fullerene intermolecular bond strength. The magnetic media can be used in the production of components for data storage system, in particular heads with magnetic transducers and magnetic or optical-magnetic discs. In methods for forming the fullerene coatings, an approximate monolayer of fullerene molecules are deposited on a metal or semiconductor surface substantially free of contaminants.Type: ApplicationFiled: April 13, 2001Publication date: December 27, 2001Inventors: John W. Dykes, Joel W. Hoehn, James E. Angelo, William D. Mosley
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Patent number: 5986851Abstract: A data head is provided which includes a slider having a transducer formed in a thin film structure at a trailing edge end of the slider. The data head also includes transducer overcoat protection which protects the transducer without increasing a spacing between the transducer and a surface of a data storage disc for a given fly height of the data head above the surface of the data storage disc. In addition, a method of fabricating the data head is disclosed.Type: GrantFiled: December 3, 1997Date of Patent: November 16, 1999Assignee: Seagate Technology, Inc.Inventors: James E. Angelo, Terry W. Schar