Patents by Inventor Mehmet F. Erden
Mehmet F. Erden 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: 11074933Abstract: A hard disk drive includes a magnetic writer and a magnetic recording medium, which includes data tracks with user data sections positioned between servo wedges. The servo wedges each can include multiple servo sectors. The hard disk drive also includes circuitry programmed to cause the magnetic writer to write user data to the multiple servo sectors in multiple servo wedges.Type: GrantFiled: September 11, 2020Date of Patent: July 27, 2021Assignee: Seagate Technology LLCInventors: Riyan A. Mendonsa, Mehmet F. Erden, Joshua W. Christensen
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Patent number: 9818445Abstract: Implementations described and claimed herein includes a storage device comprising a plurality of readers, including a first subset of readers configured to read a first subset of tracks and a second subset of readers configured to read a second subset of tracks, the first subset of tracks being wider than the second subset of tracks. In another implementation, the readers in the first subset of readers are wider than the readers in the second subset of readers. The wider readers may be configured to recover servo information and the narrow readers may be configured to recover data information. The storage devices may include two-dimensional magnetic recording, conventional perpendicular magnetic recording, shingled magnetic recording, multi-sensor magnetic recording, and interlaced magnetic recording.Type: GrantFiled: January 12, 2016Date of Patent: November 14, 2017Assignee: SEAGATE TECHNOLOGY LLCInventors: Wenzhong Zhu, Mehmet F. Erden, Kenneth A. Haapala, Wei Tian, Edward Gage
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Publication number: 20170200468Abstract: Implementations described and claimed herein includes a storage device comprising a plurality of readers, including a first subset of readers configured to read a first subset of tracks and a second subset of readers configured to read a second subset of tracks, the first subset of tracks being wider than the second subset of tracks. In another implementation, the readers in the first subset of readers are wider than the readers in the second subset of readers. The wider readers may be configured to recover servo information and the narrow readers may be configured to recover data information. The storage devices may include two-dimensional magnetic recording, conventional perpendicular magnetic recording, shingled magnetic recording, multi-sensor magnetic recording, and interlaced magnetic recording.Type: ApplicationFiled: January 12, 2016Publication date: July 13, 2017Inventors: Wenzhong Zhu, Mehmet F. Erden, Kenneth A. Haapala, Wei Tian, Edward Gage
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Patent number: 9390761Abstract: A transducing head may be connected to a controller and positioned proximal a data storage medium. The controller can be connected to a wear level identification circuit and configured to identify a first data region of the data storage medium having a first wear level and a second data region of the data storage medium having a second wear level. The first and second wear levels can respectively correspond to different amounts of component degradation of the data storage device.Type: GrantFiled: November 24, 2014Date of Patent: July 12, 2016Assignee: Seagate Technology LLCInventors: Jon D. Trantham, Mehmet F. Erden, Tim Rausch, Troy De Jongh
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Publication number: 20160148652Abstract: A transducing head may be connected to a controller and positioned proximal a data storage medium. The controller can be connected to a wear level identification circuit and configured to identify a first data region of the data storage medium having a first wear level and a second data region of the data storage medium having a second wear level. The first and second wear levels can respectively correspond to different amounts of component degradation of the data storage device.Type: ApplicationFiled: November 24, 2014Publication date: May 26, 2016Inventors: Jon D. Trantham, Mehmet F. Erden, Tim Rausch, Troy De Jongh
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Patent number: 9099160Abstract: A disc drive system provides increased reliability by detecting and correcting errors associated with bit-patterned media. Write synchronization errors associated with bit-patterned media are addressed by including data storage for temporarily storing data that is being written to the disc drive. The data is read from both the disc drive and the storage medium and compared to detect write synchronization errors. A disc drive system for correcting write synchronization errors includes an encoder, non-volatile storage, and decoder device for implementing a parity-based scheme for increased reliability. Data strings being written to the disc drive are combined in an encoder to generate a parity string. The address of the data being written to the disc drive, along with the updated parity string is stored to the non-volatile storage. The data strings are read from the disc drive by the decoder.Type: GrantFiled: November 8, 2012Date of Patent: August 4, 2015Assignee: Seagate Technology LLCInventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Sailaja V. Chilaka
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Patent number: 8331051Abstract: A disc drive system provides increased reliability by detecting and correcting errors associated with bit-patterned media. Write synchronization errors associated with bit-patterned media are addressed by including data storage for temporarily storing data that is being written to the disc drive. The data is read from both the disc drive and the storage medium and compared to detect write synchronization errors. The disc drive system utilizes the identified write synchronization errors for at least one of timing recovery, equalizer training detection, error correction code application, and error recovery.Type: GrantFiled: October 14, 2010Date of Patent: December 11, 2012Assignee: Seagate Technology LLCInventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
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Publication number: 20110249355Abstract: A disc drive system provides increased reliability by detecting and correcting errors associated with bit-patterned media. Write synchronization errors associated with bit-patterned media are addressed by including data storage for temporarily storing data that is being written to the disc drive. The data is read from both the disc drive and the storage medium and compared to detect write synchronization errors. The disc drive system utilizes the identified write synchronization errors for at least one of timing recovery, equalizer training detection, error correction code application, and error recovery.Type: ApplicationFiled: October 14, 2010Publication date: October 13, 2011Applicant: SEAGATE TECHNOLOGY LLCInventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
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Patent number: 7889823Abstract: A parallel channel timing recovery circuit. The parallel timing recovery circuit comprises multiple prefilters receiving parallel channel outputs and providing prefilter outputs. Multiple sampling filters receive the prefilter outputs and provide multiple discrete time signal samples. A self-timing circuit has multiple inputs receiving the multiple discrete time signal samples. The self-timing circuit provides a sampling control output to the sampling filters. The sampling control output is based on a composite of the multiple discrete time signal samples. Each of the sampling filters generates a discrete time signal sample based on the sampling control output and the prefilter outputs.Type: GrantFiled: March 3, 2005Date of Patent: February 15, 2011Assignee: Seagate Technology LLCInventors: Xueshi Yang, Mehmet F. Erden, Erozan M. Kurtas
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Patent number: 7835099Abstract: A disc drive system provides increased reliability by detecting and correcting errors associated with bit-patterned media. Write synchronization errors associated with bit-patterned media are addressed by including data storage for temporarily storing data that is being written to the disc drive. The data is read from both the disc drive and the storage medium and compared to detect write synchronization errors. A disc drive system for correcting write synchronization errors includes an encoder, non-volatile storage, and decoder device for implementing a parity-based scheme for increased reliability. Data strings being written to the disc drive are combined in an encoder to generate a parity string. The address of the data being written to the disc drive, along with the updated parity string is stored to the non-volatile storage. The data strings are read from the disc drive by the decoder.Type: GrantFiled: June 29, 2007Date of Patent: November 16, 2010Assignee: Seagate Technology LLCInventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
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Patent number: 7724844Abstract: A servo system for detecting and demodulating servo data is disclosed. In illustrated aspects, a demodulation circuit or portion includes a correlator component configured to output a correlation of a sequence of equalized channel samples with a sequence of correlator weight derived based on at least one mapped channel sequence. A decision component, for example a threshold detector uses the correlation results to output a data bit symbol based upon the correlation of the sequence of equalized channel samples to the at least one mapped channel sequence.Type: GrantFiled: January 31, 2007Date of Patent: May 25, 2010Assignee: Seagate Technology LLCInventors: Mehmet F. Erden, Richard L. Keizer
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Publication number: 20090003144Abstract: A disc drive system provides increased reliability by detecting and correcting errors associated with bit-patterned media. Write synchronization errors associated with bit-patterned media are addressed by including data storage for temporarily storing data that is being written to the disc drive. The data is read from both the disc drive and the storage medium and compared to detect write synchronization errors. A disc drive system for correcting write synchronization errors includes an encoder, non-volatile storage, and decoder device for implementing a parity-based scheme for increased reliability. Data strings being written to the disc drive are combined in an encoder to generate a parity string. The address of the data being written to the disc drive, along with the updated parity string is stored to the non-volatile storage. The data strings are read from the disc drive by the decoder.Type: ApplicationFiled: June 29, 2007Publication date: January 1, 2009Applicant: Seagate Technology LLCInventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
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Publication number: 20080180825Abstract: A servo system for detecting and demodulating servo data is disclosed. In illustrated aspects, a demodulation circuit or portion includes a correlator component configured to output a correlation of a sequence of equalized channel samples with a sequence of correlator weight derived based on at least one mapped channel sequence. A decision component, for example a threshold detector uses the correlation results to output a data bit symbol based upon the correlation of the sequence of equalized channel samples to the at least one mapped channel sequence.Type: ApplicationFiled: January 31, 2007Publication date: July 31, 2008Applicant: Seagate Technology LLCInventors: Mehmet F. Erden, Richard L. Keizer
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Patent number: 7265937Abstract: A data storage system in which multiple readback signals are resolved is provided. The data storage system includes a data storage medium configured to store servo marks and data marks. The data storage medium has tracks that are divided into sectors. An array of heads is configured to interact with the data storage medium. A demodulation circuit receives servo signals obtained by at least some heads of the array of heads and computes a resultant servo signal, which is used to adjust a position of the array of heads over the storage medium.Type: GrantFiled: June 9, 2006Date of Patent: September 4, 2007Assignee: Seagate Technology LLCInventors: Mehmet F. Erden, Mark D. Bedillion, Erozan M. Kurtas, Xueshi Yang, Darren W. Karns
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Patent number: 6754015Abstract: A disc drive data recovery system for recovering data from a magnetic disc having asperities provided. Readback data follows a nominal readback path and a thermal asperity cancellation readback path. A thermal asperity detector detects a thermal asperity in the readback signal and responsively selects the readback signal which follows the thermal asperity cancellation readback path.Type: GrantFiled: August 21, 2002Date of Patent: June 22, 2004Assignee: Seagate Technology LLCInventors: Mehmet F. Erden, Erozan M. Kurtas
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Publication number: 20030184897Abstract: A disc drive data recovery system for recovering data from a magnetic disc having asperities provided. Readback data follows a nominal readback path and a thermal asperity cancellation readback path. A thermal asperity detector detects a thermal asperity in the readback signal and responsively selects the readback signal which follows the thermal asperity cancellation readback path.Type: ApplicationFiled: August 21, 2002Publication date: October 2, 2003Inventors: Mehmet F. Erden, Erozan M. Kurtas