Patents by Inventor Housan Dakroub
Housan Dakroub 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: 9355677Abstract: The implementations disclosed herein provide for a storage device including a preamplifier that dynamically adjusts at least one of a rise time and fall time of an analog write current pulse based on a length of a corresponding write transition and/or characteristics of a media location where the write transition is to be recorded.Type: GrantFiled: January 30, 2014Date of Patent: May 31, 2016Assignee: SEAGATE TECHNOLOGY LLCInventors: Todd Michael Lammers, Housan Dakroub, Jason C. Jury
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Patent number: 9123372Abstract: A transducer is configured to interact with a magnetic storage medium, a first channel comprises a first sensor and first circuitry configured to adjust a plurality of first channel parameters, and a second channel comprises a second sensor and second circuitry configured to adjust a plurality of second channel parameters. The first and second channel parameters are independently adjustable by the first and second circuitry, respectively. A detector is coupled to the first and second channels, and configured to detect a head-medium interface event.Type: GrantFiled: August 12, 2014Date of Patent: September 1, 2015Assignee: SEAGATE TECHNOLOGY LLCInventors: Housan Dakroub, Edward Charles Gage, Tim Rausch
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Patent number: 9123355Abstract: A circuit may be configured to reduce the power consumption and extend the life of a near field transducer of a heat-assisted magnetic recording (HAMR) device by pulsing a laser. The current that drives the laser may be of a frequency and magnitude so as to approximate the value of a continuous current in a continuous, non-pulsed laser. A system on chip (SOC), which may include a HAMR channel, can generate a laser data signal that may be synchronous with, and offset from, a write signal by a certain period of time, and may calculate certain parameters such as peak current and pulse width that may be applied to the signals in a preamp. The preamp signals can be used to program data to a disc medium.Type: GrantFiled: September 16, 2013Date of Patent: September 1, 2015Assignee: Seagate Technology LLCInventors: Housan Dakroub, Christine Green, Edward C. Gage, Tim Rausch
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Publication number: 20150213813Abstract: The implementations disclosed herein provide for a storage device including a preamplifier that dynamically adjusts at least one of a rise time and fall time of an analog write current pulse based on a length of a corresponding write transition and/or characteristics of a media location where the write transition is to be recorded.Type: ApplicationFiled: January 30, 2014Publication date: July 30, 2015Applicant: SEAGATE TECHNOLOGY LLCInventors: Todd Michael Lammers, Housan Dakroub, Jason C. Jury
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Patent number: 9070377Abstract: Polarity transitions of a write signal applied to a write coil correspond to first bit boundaries written to a magnetic recording media. A heat signal is applied to heat the magnetic recording media via a heat source while bits are being written. The heat signal includes negative pulses that de-energize the heat source during cooling periods corresponding to the writing of the first bit boundaries. The negative pulses are offset from the polarity transitions by a predetermined time.Type: GrantFiled: December 12, 2013Date of Patent: June 30, 2015Assignee: SEAGATE TECHNOLOGY LLCInventors: Housan Dakroub, Edward Charles Gage, Jan-Ulrich Thiele
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Publication number: 20150170699Abstract: Polarity transitions of a write signal applied to a write coil correspond to first bit boundaries written to a magnetic recording media. A heat signal is applied to heat the magnetic recording media via a heat source while bits are being written. The heat signal includes negative pulses that de-energize the heat source during cooling periods corresponding to the writing of the first bit boundaries. The negative pulses are offset from the polarity transitions by a predetermined time.Type: ApplicationFiled: December 12, 2013Publication date: June 18, 2015Applicant: Seagate Technology LLCInventors: Housan Dakroub, Edward Charles Gage, Jan-Ulrich Thiele
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Patent number: 9042207Abstract: Controlling a laser diode involves activating a first current source in preparation for writing to a magnetic recording medium. The first current source applies a threshold current to a laser diode that brings the laser diode close to an operating point. Responsive to a write signal, a second current source is activated that applies a write current to the laser diode. A combination of the write current and the threshold current fully energizes the laser diode and is less than a target recording current. Coincident with the activation of the second current source, a photodiode is activated that is optically coupled to the laser diode. The activated photodiode causes a feedback current to be applied to the laser diode.Type: GrantFiled: May 9, 2013Date of Patent: May 26, 2015Assignee: SEAGATE TECHNOLOGY LLCInventor: Housan Dakroub
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Patent number: 9019646Abstract: An apparatus includes a write element configured to apply a magnetic field to write data on a portion of a heat-assisted magnetic recording media in response to an energizing current. An energy source is configured to heat the portion of the media being magnetized by the write element. A preheat energizing current is applied to the write element during an interval before writing the data to the portion of the media. The preheat energizing current does not cause data to be written to the media and brings at least one of the write element and driver circuitry into thermal equilibrium prior to writing the data on the portion.Type: GrantFiled: March 14, 2013Date of Patent: April 28, 2015Assignee: Seagate Technology LLCInventors: Tim Rausch, Jon D. Trantham, John West Dykes, Housan Dakroub, Charles Paul Henry, Edward Charles Gage, Raul Horacio Andruet, James Gary Wessel, James Dillon Kiely, Bruce Douglas Buch, Barmeshwar Vikramaditya
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Publication number: 20150003222Abstract: A transducer is configured to interact with a magnetic storage medium, a first channel comprises a first sensor and first circuitry configured to adjust a plurality of first channel parameters, and a second channel comprises a second sensor and second circuitry configured to adjust a plurality of second channel parameters. The first and second channel parameters are independently adjustable by the first and second circuitry, respectively. A detector is coupled to the first and second channels, and configured to detect a head-medium interface event.Type: ApplicationFiled: August 12, 2014Publication date: January 1, 2015Inventors: Housan Dakroub, Edward Charles Gage, Tim Rausch
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Publication number: 20140334274Abstract: Controlling a laser diode involves activating a first current source in preparation for writing to a magnetic recording medium. The first current source applies a threshold current to a laser diode that brings the laser diode close to an operating point. Responsive to a write signal, a second current source is activated that applies a write current to the laser diode. A combination of the write current and the threshold current fully energizes the laser diode and is less than a target recording current. Coincident with the activation of the second current source, a photodiode is activated that is optically coupled to the laser diode. The activated photodiode causes a feedback current to be applied to the laser diode.Type: ApplicationFiled: May 9, 2013Publication date: November 13, 2014Applicant: SEAGATE TECHNOLOGY LLCInventor: Housan Dakroub
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Patent number: 8804272Abstract: A transducer is configured to interact with a magnetic storage medium, a first channel comprises a first sensor and first circuitry configured to adjust a plurality of first channel parameters, and a second channel comprises a second sensor and second circuitry configured to adjust a plurality of second channel parameters. The first and second channel parameters are independently adjustable by the first and second circuitry, respectively. A detector is coupled to the first and second channels, and configured to detect a head-medium interface event.Type: GrantFiled: July 1, 2013Date of Patent: August 12, 2014Assignee: Seagate Technology LLCInventors: Housan Dakroub, Edward Charles Gage, Tim Rausch
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Patent number: 8687311Abstract: A first parameter associated with a writer preamp is defined. A write current of the writer preamp is adjusted in accordance with the first parameter so that an asymmetric signal is applied at a write head. The asymmetric signal results in symmetric writing of bits to a medium.Type: GrantFiled: May 11, 2012Date of Patent: April 1, 2014Assignee: Seagate Technology LLCInventors: Housan Dakroub, Todd Michael Lammers, Thomas Lee Schick
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Publication number: 20140029396Abstract: An apparatus includes a write element configured to apply a magnetic field to write data on a portion of a heat-assisted magnetic recording media in response to an energizing current. An energy source is configured to heat the portion of the media being magnetized by the write element. A preheat energizing current is applied to the write element during an interval before writing the data to the portion of the media. The preheat energizing current does not cause data to be written to the media and brings at least one of the write element and driver circuitry into thermal equilibrium prior to writing the data on the portion.Type: ApplicationFiled: March 14, 2013Publication date: January 30, 2014Applicant: Seagate Technology LLCInventors: Tim Rausch, Jon D. Trantham, John West Dykes, Housan Dakroub, Charles Paul Henry, Edward Charles Gage, Raul Horacio Andruet, James Gary Wessel, James Dillon Kiely, Bruce Douglas Buch, Barmeshwar Vikramaditya
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Publication number: 20130301156Abstract: A first parameter associated with a writer preamp is defined. A write current of the writer preamp is adjusted in accordance with the first parameter so that an asymmetric signal is applied at a write head. The asymmetric signal results in symmetric writing of bits to a medium.Type: ApplicationFiled: May 11, 2012Publication date: November 14, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Housan Dakroub, Todd Michael Lammers, Thomas Lee Schick
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Patent number: 8422172Abstract: A disk drive is disclosed. The disk drive comprises a disk, a head configured to write data to and read data from the disk, and an actuator configured to position the head relative to the disk. The disk drive also comprises a die including internal circuitry electrically coupled to the head and a bypass trace electrically coupled to the actuator, wherein the internal circuitry comprises one or more preamplifiers and the bypass trace is electrically isolated from the internal circuitry.Type: GrantFiled: October 1, 2010Date of Patent: April 16, 2013Assignee: Western Digital Technologies, Inc.Inventors: Housan Dakroub, Dennis Hogg
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Patent number: 8130458Abstract: Data storage systems are provided. Data storage systems illustratively include a recording head having a writing element and a bit patterned medium having a plurality of media dots. In some embodiments, the plurality of media dots pass the recording head at a media dot frequency. In some embodiments, the writing element writes data to the bit patterned media at a writing frequency that is less than the media dot frequency.Type: GrantFiled: August 11, 2009Date of Patent: March 6, 2012Assignee: Seagate Technology LLCInventors: Kaizhong Gao, Housan Dakroub
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Patent number: 8089719Abstract: A disk drive comprising a head actuated over a disk, and a touchdown sensor for generating a sensor signal. The sensor signal is filtered using at least three bandpass filters to generate at least three filtered signals. The fly height of the head is decreased until one of the filtered signals indicates the head has contacted the disk.Type: GrantFiled: June 1, 2010Date of Patent: January 3, 2012Assignee: Western Digital Technologies, Inc.Inventor: Housan Dakroub
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Publication number: 20110038072Abstract: Data storage systems are provided. Data storage systems illustratively include a recording head having a writing element and a bit patterned medium having a plurality of media dots. In some embodiments, the plurality of media dots pass the recording head at a media dot frequency. In some embodiments, the writing element writes data to the bit patterned media at a writing frequency that is less than the media dot frequency.Type: ApplicationFiled: August 11, 2009Publication date: February 17, 2011Applicant: Seagate Technology LLCInventors: Kaizhong Gao, Housan Dakroub
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Patent number: 7656600Abstract: The disclosure is related to detecting a fault condition of a transducer for reading and writing data to a data storage medium. The fault condition can be detected based on a potential difference between a reference voltage and a common mode of the transducer.Type: GrantFiled: May 11, 2007Date of Patent: February 2, 2010Assignee: Seagate Technology LLCInventors: Housan Dakroub, Stefan Andrei Ionescu
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Publication number: 20080278835Abstract: The disclosure is related to detecting a fault condition of a transducer for reading and writing data to a data storage medium. The fault condition can be detected based on a potential difference between a reference voltage and a common mode of the transducer.Type: ApplicationFiled: May 11, 2007Publication date: November 13, 2008Applicant: SEAGATE TECHNOLOGY, LLCInventors: Housan Dakroub, Stefan Andrei Ionescu