Patents by Inventor Puskal Prasad Pokharel
Puskal Prasad Pokharel 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: 10777224Abstract: Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).Type: GrantFiled: August 30, 2019Date of Patent: September 15, 2020Assignee: Seagate Technology LLCInventors: Timothy Francis Ellis, Gary Ernest Hillukka, Joshua Ward Christensen, Puskal Prasad Pokharel
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Publication number: 20190385640Abstract: Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).Type: ApplicationFiled: August 30, 2019Publication date: December 19, 2019Applicant: SEAGATE TECHNOLOGY LLCInventors: Timothy Francis ELLIS, Gary Ernest HILLUKKA, Joshua Ward Christensen, Puskal Prasad POKHAREL
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Patent number: 10438620Abstract: Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).Type: GrantFiled: March 26, 2018Date of Patent: October 8, 2019Assignee: SEAGATE TECHNOLOGY LLCInventors: Timothy Francis Ellis, Gary Ernest Hillukka, Joshua Ward Christensen, Puskal Prasad Pokharel
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Publication number: 20190295579Abstract: Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).Type: ApplicationFiled: March 26, 2018Publication date: September 26, 2019Applicant: SEAGATE TECHNOLOGY LLCInventors: Timothy Francis ELLIS, Gary Ernest HILLUKKA, Joshua Ward Christensen, Puskal Prasad POKHAREL
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Patent number: 10332557Abstract: A servo sector on a disk is read via first and second readers that both span two or more user data tracks. The servo sector has a crosstrack width that spans the two or more user data tracks. The first reader provides a first signal based on detecting a total longitudinal field of the servo sector. The second reader provides a second signal based on detecting a total perpendicular field of the servo sector. A position error of the first and second readers is detected using. A value of the first signal can be used to detect a position error, detect a track-to-track phase error, and/or detect a Gray code error of a track ID field of the servo sector.Type: GrantFiled: September 13, 2018Date of Patent: June 25, 2019Assignee: Seagate Technology LLCInventors: Riyan Mendonsa, Puskal Prasad Pokharel, Walter R. Eppler
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Patent number: 9865291Abstract: First and second read channel logic circuits are configured to process first and second signals communicated from respective first and second readers that simultaneously read from a magnetic disk. A first servo detection circuit generates a primary servo gate based on timing data from the first reader. The primary servo gate is used for processing the first signal via the first read channel logic. A second servo detection circuit that generates a secondary servo gate based on the primary servo gate and an adjustment value. The secondary servo gate is used for processing the second signal via the second read channel logic.Type: GrantFiled: May 22, 2017Date of Patent: January 9, 2018Assignee: SEAGATE TECHNOLOGY LLCInventors: Puskal Prasad Pokharel, Gary E. Hillukka, Timothy F. Ellis
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Patent number: 9792939Abstract: At least a portion of a first servo mark is read using a first read head during a rotation of a disk, the rotation comprising no more than 360 degrees. At least a portion of a second servo mark is read using a second read head during the rotation of the disk. Tracking positions of the first read head and the second read head are determined during the rotation based on reading the first servo mark and the second servo mark.Type: GrantFiled: May 13, 2014Date of Patent: October 17, 2017Assignee: SEAGATE TECHNOLOGY LLCInventors: Riyan Mendonsa, Puskal Prasad Pokharel
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Patent number: 9768988Abstract: An apparatus and associated methodology providing read channel circuitry having a signal equalizer that sends an equalized signal to a bit detector. The read channel circuitry is capable of sampling values of the equalized signal to identify a bit transition from among a predefined plurality of different bit transitions. The apparatus may have channel optimization (CO) logic that, based on the input signal and the sampling of the equalized signal, defines first values for a programmable parameter of the bit detector that substantially maximizes vector separations among vectors of waveform target samples corresponding to the predefined plurality of different bit transitions, while the CO logic also defines second values for a programmable parameter of the equalizer that substantially minimizes the mean squared separation of the equalized signal segment for each bit transition from the waveform target corresponding to that bit transition.Type: GrantFiled: December 20, 2012Date of Patent: September 19, 2017Assignee: SEAGATE TECHNOLOGY LLCInventors: Puskal Prasad Pokharel, Mustafa Can Ozturk, Barmeshwar Vikramaditya
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Patent number: 9514775Abstract: In a servo control loop, servo burst signals that are read from a plurality of servo burst patterns that include a split servo burst pattern contain frequency acquisition error. The frequency acquisition error is at least partially removed to generate a frequency acquisition error compensated position error signal (PES).Type: GrantFiled: January 21, 2009Date of Patent: December 6, 2016Assignee: Seagate Technology LLCInventors: Richard Lyle Keizer, Mustafa Can Ozturk, Puskal Prasad Pokharel
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Patent number: 9401167Abstract: Two or more signals are read from two or more respective tracks of a disk drive recording medium using respective two or more read transducers co-located on a slider. The slider is aligned to the two or more tracks in response to the correlation between the two or more signals.Type: GrantFiled: July 20, 2015Date of Patent: July 26, 2016Assignee: SEAGATE TECHNOLOGY LLCInventors: Puskal Prasad Pokharel, Riyan Mendonsa
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Publication number: 20150356988Abstract: Two or more signals are read from two or more respective tracks of a disk drive recording medium using respective two or more read transducers co-located on a slider. The slider is aligned to the two or more tracks in response to the correlation between the two or more signals.Type: ApplicationFiled: July 20, 2015Publication date: December 10, 2015Inventors: Puskal Prasad Pokharel, Riyan Mendonsa
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Publication number: 20150332719Abstract: At least a portion of a first servo mark is read using a first read head during a rotation of a disk, the rotation comprising no more than 360 degrees. At least a portion of a second servo mark is read using a second read head during the rotation of the disk. Tracking positions of the first read head and the second read head are determined during the rotation based on reading the first servo mark and the second servo mark.Type: ApplicationFiled: May 13, 2014Publication date: November 19, 2015Applicant: Seagate Technology LLCInventors: Riyan Mendonsa, Puskal Prasad Pokharel
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Patent number: 9178531Abstract: The disclosure is related to systems and methods for achieving improved servo Gray code error detection and correction. A device may include a circuit configured to read servo data that is encoded using a Gray code encoding scheme to produce servo Gray code, read one or more Check bits associated with the servo Gray code, determine whether a read or write head is positioned over a target data track based on the servo Gray code and the one or more Check bits, and execute a read or write operation when the read or write head is positioned over the target data track.Type: GrantFiled: April 24, 2013Date of Patent: November 3, 2015Assignee: Seagate Technology LLCInventors: Mustafa Can Ozturk, Puskal Prasad Pokharel, Barmeshwar Vikramaditya, Thomas C. Zirps
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Patent number: 9087541Abstract: Servo data of one or more tracks of a disk are collected using first and second read transducers co-located on a slider. Redundant portions of the servo data collected by the first and second read transducers are compared, and at least part of the servo data validating or corrected based on comparing the redundant portions.Type: GrantFiled: June 5, 2014Date of Patent: July 21, 2015Assignee: SEAGATE TECHNOLOGY LLCInventors: Puskal Prasad Pokharel, Riyan Mendonsa
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Patent number: 8972816Abstract: The disclosure is related to systems and methods for servo Gray code error detection and correction. A device may include a circuit configured to 1) selectively implement a quality-based error correction system to determine an error in the servo Gray code and correct the error; 2) selectively implement a trajectory-based error correction system to determine an error in the servo Gray code and correct the error; or 3) implement any combination of a quality-based error correction system and a trajectory-based error correction system to determine an error in the servo Gray code and correct the error.Type: GrantFiled: March 22, 2012Date of Patent: March 3, 2015Assignee: Seagate Technology LLCInventors: Mustafa Can Ozturk, Puskal Prasad Pokharel, Barmeshwar Vikramaditya, Patrick John Korkowski
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Patent number: 8953276Abstract: First and second user data signals of respective first and second tracks are simultaneously read from a disk via first and second read transducers co-located on a slider. A position error of the first and second read transducers is corrected based on the first and second user data signals.Type: GrantFiled: June 5, 2014Date of Patent: February 10, 2015Assignee: Seagate Technology LLCInventors: Puskal Prasad Pokharel, Riyan Mendonsa
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Patent number: 8953279Abstract: At least three servo burst frequencies are simultaneously detected during a rotation of a disk using a read head. A position of the read head during the rotation is determined based on simultaneously reading at least two of the at least three servo burst frequencies.Type: GrantFiled: March 21, 2014Date of Patent: February 10, 2015Assignee: Seagate Technology LLCInventors: Riyan Mendonsa, Puskal Prasad Pokharel
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Patent number: 8947809Abstract: A bit patterned media (BPM) encoded recordable medium includes a servo control field including servo bits. Each servo bit is represented by a servo bit pattern of dots and gaps on the recordable medium. In the servo bit patterns, substantially no two dots are placed immediately next to one another, and substantially all servo bit patterns start with a gap and/or substantially all servo bit patterns end with a gap.Type: GrantFiled: September 19, 2008Date of Patent: February 3, 2015Assignee: Seagate Technology LLCInventors: Mustafa Can Ozturk, Puskal Prasad Pokharel
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Patent number: 8824079Abstract: A servo control field on a recordable medium includes a bit patterned media (BPM) pattern including a plurality of dots arranged in a down-track orientation and in a cross-track orientation, wherein the dots comprise a plurality of dot composites. Each of the dot composites includes a plurality of dots. A first spacing between adjacent ones of the plurality of dots in a dot composite in the down-track direction on the recordable medium is less than a second spacing between adjacent ones of the plurality of dot composites in the down-track direction. A readback signal generated in response to the BPM patterned may be filtered to attenuate harmonic frequencies in the readback signal.Type: GrantFiled: December 17, 2008Date of Patent: September 2, 2014Assignee: Seagate Technology LLCInventors: Puskal Prasad Pokharel, Mustafa Can Ozturk
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Publication number: 20130250448Abstract: The disclosure is related to systems and methods for servo Gray code error detection and correction. A device may include a circuit configured to 1) selectively implement a quality-based error correction system to determine an error in the servo Gray code and correct the error; 2) selectively implement a trajectory-based error correction system to determine an error in the servo Gray code and correct the error; or 3) implement any combination of a quality-based error correction system and a trajectory-based error correction system to determine an error in the servo Gray code and correct the error.Type: ApplicationFiled: March 22, 2012Publication date: September 26, 2013Applicant: Seagate Technology LLCInventors: Mustafa Can Ozturk, Puskal Prasad Pokharel, Barmeshwar Vikramaditya, Patrick John Korkowski