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).

  • Patent number: 9818445
    Abstract: 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: Grant
    Filed: January 12, 2016
    Date of Patent: November 14, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Wenzhong Zhu, Mehmet F. Erden, Kenneth A. Haapala, Wei Tian, Edward Gage
  • Publication number: 20170200468
    Abstract: 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: Application
    Filed: January 12, 2016
    Publication date: July 13, 2017
    Inventors: Wenzhong Zhu, Mehmet F. Erden, Kenneth A. Haapala, Wei Tian, Edward Gage
  • Patent number: 9390761
    Abstract: 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: Grant
    Filed: November 24, 2014
    Date of Patent: July 12, 2016
    Assignee: Seagate Technology LLC
    Inventors: Jon D. Trantham, Mehmet F. Erden, Tim Rausch, Troy De Jongh
  • Publication number: 20160148652
    Abstract: 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: Application
    Filed: November 24, 2014
    Publication date: May 26, 2016
    Inventors: Jon D. Trantham, Mehmet F. Erden, Tim Rausch, Troy De Jongh
  • Patent number: 9099160
    Abstract: 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: Grant
    Filed: November 8, 2012
    Date of Patent: August 4, 2015
    Assignee: Seagate Technology LLC
    Inventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Sailaja V. Chilaka
  • Patent number: 8331051
    Abstract: 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: Grant
    Filed: October 14, 2010
    Date of Patent: December 11, 2012
    Assignee: Seagate Technology LLC
    Inventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
  • Publication number: 20110249355
    Abstract: 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: Application
    Filed: October 14, 2010
    Publication date: October 13, 2011
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
  • Patent number: 7889823
    Abstract: 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: Grant
    Filed: March 3, 2005
    Date of Patent: February 15, 2011
    Assignee: Seagate Technology LLC
    Inventors: Xueshi Yang, Mehmet F. Erden, Erozan M. Kurtas
  • Patent number: 7835099
    Abstract: 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: Grant
    Filed: June 29, 2007
    Date of Patent: November 16, 2010
    Assignee: Seagate Technology LLC
    Inventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
  • Patent number: 7724844
    Abstract: 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: Grant
    Filed: January 31, 2007
    Date of Patent: May 25, 2010
    Assignee: Seagate Technology LLC
    Inventors: Mehmet F. Erden, Richard L. Keizer
  • Publication number: 20090003144
    Abstract: 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: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Applicant: Seagate Technology LLC
    Inventors: Michael L. Mallary, Mehmet F. Erden, Ching He, Venkata S. Chilaka
  • Publication number: 20080180825
    Abstract: 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: Application
    Filed: January 31, 2007
    Publication date: July 31, 2008
    Applicant: Seagate Technology LLC
    Inventors: Mehmet F. Erden, Richard L. Keizer
  • Patent number: 7265937
    Abstract: 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: Grant
    Filed: June 9, 2006
    Date of Patent: September 4, 2007
    Assignee: Seagate Technology LLC
    Inventors: Mehmet F. Erden, Mark D. Bedillion, Erozan M. Kurtas, Xueshi Yang, Darren W. Karns
  • Patent number: 6754015
    Abstract: 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: Grant
    Filed: August 21, 2002
    Date of Patent: June 22, 2004
    Assignee: Seagate Technology LLC
    Inventors: Mehmet F. Erden, Erozan M. Kurtas
  • Publication number: 20030184897
    Abstract: 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: Application
    Filed: August 21, 2002
    Publication date: October 2, 2003
    Inventors: Mehmet F. Erden, Erozan M. Kurtas