Patents Assigned to Seagate Technologies
  • WRITE POLE WITH VARYING BEVEL ANGLES
    Publication number: 20150103439
    Abstract: A magnetic element can have at least a write pole configured with a write pole tip that has a tip surface oriented at a first angle with respect to an air bearing surface (ABS), a first bevel surface extending from the ABS and oriented at a second angle with respect to the ABS, and a second bevel surface extending from the ABS and oriented at a third angle with respect to the ABS. The first, second, and third angles may be configured to be different and non-orthogonal to each other.
    Type: Application
    Filed: October 11, 2013
    Publication date: April 16, 2015
    Applicant: Seagate Technology LLC
    Inventors: Huaqing Yin, Wei Tian, Zhe Shen, Kirill Rivkin, Jianhua Xue
  • Method and apparatus for relocating data
    Patent number: 9009433
    Abstract: Disclosed are an apparatus and method for recycling areas of a data storage device by relocating data. In one embodiment, a method may comprise selecting a first storage area based on a quantity of obsolete data in the first storage area, moving valid data from the first storage area to a second storage area, and setting memory spaces corresponding to the first storage area as available memory for storing other data. Another embodiment may further comprise selecting a physical address-based move operation or a logical address-based move operation based on a number of sets of contiguous valid memory spaces in the first storage area, wherein the physical address-based move comprises moving data based on physical data addresses, and logical address-based moved comprises moving data based on logical block addresses.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: April 14, 2015
    Assignee: Seagate Technology LLC
    Inventor: In Sik Ryu
  • Retention detection and/or channel tracking policy in a flash memory based storage system
    Patent number: 9007842
    Abstract: A method for determining a retention time in a solid state device (SSD), comprising the steps of providing a plurality of write operations to a memory, determining a reference voltage for each of the write operations, determining a difference between (i) the reference voltage after each of the write operations and (ii) a target reference voltage and if the difference is above a predetermined value, generating a flag indicating an excessive retention has occurred.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 14, 2015
    Assignee: Seagate Technology LLC
    Inventors: Zhengang Chen, Jeremy Werner, Ying Quan Wu, Erich F. Haratsch
  • Reduced polar codes
    Patent number: 9007241
    Abstract: A method for encoding a reduced polar code is disclosed. The method generally includes steps (A) to (C). Step (A) may generate the intermediate codeword by polar code encoding input data. Step (B) may remove one or more bits from one of (i) a first part of the intermediate codeword and (ii) a second part of the intermediate codeword. Step (C) may generate an output codeword by concatenating the first part of the intermediate codeword with the second part of the intermediate codeword after the bits are removed.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: April 14, 2015
    Assignee: Seagate Technology LLC
    Inventors: AbdelHakim S. Alhussien, Erich F. Haratsch, Yue Li
  • Magnetic recording medium for perpendicular magnetic recording
    Patent number: 9005781
    Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be antiparallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: April 14, 2015
    Assignee: Seagate Technology LLC
    Inventors: Jianing Zhou, B. Ramamurthy Acharya, E. Noel Abarra, Gunn Choe
  • Rewrite operation for recording bands
    Patent number: 9007710
    Abstract: Systems and methods are disclosed for performing a rewrite operation on recording bands of a data storage medium. In some embodiments, data may be read from a target band including a plurality of tracks, and modified. A portion less than all of the modified data is stored to a nonvolatile memory, and all of the modified data is written to the target band. In some embodiments, modified data corresponding to the first two tracks of the target band is stored to the nonvolatile memory, and modified data corresponding to the third track of the target band is written back to the first physical track. Each track may be written in order, ending with the modified data corresponding to the first two tracks. The result may be that data for each track in the band has shifted up two tracks, with data for the first two tracks moved to the end.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: April 14, 2015
    Assignee: Seagate Technology
    Inventors: Xiong Liu, Brian T Edgar, Feng Shen, WenXiang Xie, ThanZaw Thein
  • Heater to keep reader head in stable temperature range
    Patent number: 9007882
    Abstract: Technologies are described herein for utilizing a head heater to test temperature stability of a head of a storage device and to prevent the head from operating in an unstable temperature condition. A first power level may be applied to a head heater of a head in a storage device, the first power level configured to simulate a temperature condition in the head. An instability of the head is determined and the temperature condition and the instability of the head are recorded in a memory. The process may be repeated to develop a range of temperature conditions in which the head exhibits instability. The range of temperature conditions and the head heater may then be utilized to prevent the head from operating in an unstable temperature condition during normal operation.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: April 14, 2015
    Assignee: Seagate Technology LLC
    Inventors: Jung Wook Hur, Tae Won Kim, Haejung Lee
  • ELECTRICALLY INSULATING MAGNETIC MATERIAL FOR A READ HEAD
    Publication number: 20150098152
    Abstract: An apparatus such as a magnetic recording head with at least two separately addressable read transducers that are coplanar in a cross track direction. The apparatus includes first coplanar electrical contacts respectively disposed on and in electrical contact with first surfaces of the at least two read transducers and an electrically insulating magnetic material disposed between the electrical contacts.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 9, 2015
    Applicant: Seagate Technology LLC
    Inventors: Jason Bryce Gadbois, Steven A. Mastain, James K. Price
  • Slider Level Lapping Carrier
    Publication number: 20150099427
    Abstract: A carrier may be configured and operated to engage a lapping plate with a plurality of physically separated sliders attached to a common adhesive of the carrier. The carrier can be constructed to have at least one finger adjacent to and capable of translating a single slider of the plurality of physically separated sliders.
    Type: Application
    Filed: October 3, 2013
    Publication date: April 9, 2015
    Applicant: Seagate Technology LLC
    Inventor: Mark Allen Herendeen
  • MAGNETIC READ HEAD WITH SEPARATELY ADDRESSABLE READ TRANSDUCERS
    Publication number: 20150098151
    Abstract: A read head with at least two separately addressable read transducers that are coplanar in a cross track direction. The read transducers have a cross track width, wr, and a center-to-center separation distance between the two read transducers either greater than 3wr or the distance of two tracks of an associated medium in the cross track direction.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 9, 2015
    Applicant: Seagate Technology LLC
    Inventors: Jason Bryce Gadbois, Steven A. Mastain, James K. Price
  • PROTECTING VOLATILE DATA OF A STORAGE DEVICE IN RESPONSE TO A STATE RESET
    Publication number: 20150100820
    Abstract: An imminent state reset of a data storage device is detected. In response to determining volatile data of the data storage device could be lost in response to the state reset, the volatile data of the data storage device is stored to a backup memory of the data storage device together with first header data that facilitates recovering the volatile data. The backup memory includes non-volatile, solid-state memory. In response to determining the volatile data would not be lost in response to the state reset, second header data is stored in the backup memory. After the state reset, a recovery of the volatile data from in the backup memory is attempted if the first header data is detected, or a host device is alerted if neither the first header data or second header data is detected.
    Type: Application
    Filed: October 8, 2013
    Publication date: April 9, 2015
    Applicant: Seagate Technology LLC
    Inventors: Steven Faulhaber, Brian Thomas Edgar, Vidya Krishnamurthy, Shuangyi Tang, Srikanth Methuku, Yong Yang, ChuanPeng Ong
  • Magnetic Sensor Shield Pinned by a High-Coercivity Ferromagnet
    Publication number: 20150098155
    Abstract: A magnetic sensor may generally be configured as a data reader capable of sensing data bits from an adjacent data storage medium. Various embodiments of a magnetic element may have at least a magnetic stack that contacts at least a first shield. The first shield can have at least one synthetic antiferromagnetic structure (SAFS) that is pinned by a high-coercivity ferromagnetic (HCFM) layer.
    Type: Application
    Filed: October 3, 2013
    Publication date: April 9, 2015
    Applicant: Seagate Technology LLC
    Inventors: Adam Andrzej Lapicki, Kevin A. McNeill, Marcus W. Ormston, Sameh Sayed Ali Hassan, Yuqing Du
  • Head to media proximity detection
    Patent number: 9001452
    Abstract: In one implementation, a method and apparatus is provided for determining an active fly height setting for a transducer head from samples collected from a proximity sensor during less than a single revolution of a disc. Implementations of the method and system use adaptive discrete wavelet transform parameters generated from the collected samples to determine an active fly height setting for a transducer head.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: Antanas Daugela, Jon D. Trantham, Srinivas Tadepalli
  • Advanced air bearing slider with modulation decreasing stiffness
    Patent number: 9001468
    Abstract: A data storage device may have at least a slider constructed with at least one feature positioned on an air bearing region and separated from a data transducer. The at least one feature can be configured to provide a slider stiffness that decreases modulation while the at least one feature is floating above or in contact with a data storage media.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: James Ronald Krolnik, II, Adam Karl Himes
  • Shield stabilization configuration with applied bias
    Patent number: 9001472
    Abstract: An apparatus includes a sensor stack, first and second shields positioned on opposite sides of the sensor stack, and a first shield stabilization structure adjacent to the first shield and applying a bias magnetic field to the first shield. A second shield stabilization structure can be positioned adjacent to the second shield.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: Eric Walter Singleton, Junjie Quan, Jae-Young Yi
  • Magnetic element with biasing structure distal the air bearing surface
    Patent number: 9001474
    Abstract: An apparatus can be generally directed to a magnetic stack having a magnetically free layer positioned on an air bearing surface (ABS). The magnetically free layer can be biased to a predetermined magnetization in various embodiments by a biasing structure that is coupled with the magnetically free layer and positioned distal the ABS.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: Mark William Covington, Dimitar Velikov Dimitrov, Dian Song
  • Clearance distance verification and control
    Patent number: 9001451
    Abstract: Method and apparatus for verifying and controlling a clearance distance of an object, such as but not limited to a fly height of a read/write transducer adjacent a recording medium in a data storage device. In accordance with some embodiments, a sensor is used to sense a plurality of patterns from an adjacent surface, with each pattern being written at a different constant frequency. A final clearance distance between the sensor and the surface is established in response to a multi-frequency response ratio from the sensor and a single frequency response ratio from the sensor.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: Richard E. Martin, Quinn J. Haddock
  • Object-based data storage device
    Patent number: 9002795
    Abstract: A data storage device includes storage media with multiple media zone attributes of storage performance. The storage device includes a data channel that is connectable to a host system. The data channel receives an object from the host system that has a requested storage attribute attached to the object. The storage device comprises an object-based storage interface that couples between the data channel and the storage media. The object-based storage interface schedules the object for storage in a selected zone of the multiple media zones based on the attributes and requested attributes.
    Type: Grant
    Filed: January 26, 2006
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: Daniel Edward Messinger, Wilson M. Fish, Sami Iren, Erik Riedel
  • Soft erasure of memory cells
    Patent number: 9001578
    Abstract: Apparatus and method for managing data in a memory, such as but not limited to a flash memory array. In accordance with some embodiments, a soft erasure is performed on a block of memory cells by toggling an erasure status value without otherwise affecting a written state of the cells in the block. The memory cells are subsequently overwritten with a set of data using a write polarity direction determined responsive to the toggled erasure status value.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: YoungPil Kim, Dadi Setiadi, Wei Tian, Antoine Khoueir, Rodney Virgil Bowman
  • Formation of non-magnetic grooves
    Patent number: 8999118
    Abstract: A method is disclosed for defining discrete magnetic and non-magnetic regions on the magnetic film layer of a storage media substrate. The method applies anodic oxidation of a cobalt-containing magnetic film layer to remove cobalt, followed by controlled deposition of a non-magnetic matrix into the regions where the cobalt has been removed. Deposition may either be electrodeposition, collimated vacuum deposition, or other methods depending upon the composition of the non-magnetic matrix being deposited. The method may be performed in a single electrochemical cell.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 7, 2015
    Assignee: Seagate Technology LLC
    Inventors: Ibro Tabakovic, Steve Riemer, Jie Gong, Mark Thomas Kief, Ming Sun