Patents by Inventor Kaizhong Gao

Kaizhong Gao 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).

  • INTERLACED MAGNETIC RECORDING
    Publication number: 20160148642
    Abstract: A storage device includes a transducer head including a first write element configured to write data at a first write width and a second write element configured to write data at a second write width less than the first write width. According to one implementation, the first write element writes data at a first linear density and to alternating data tracks and the second write element writes data at a second linear density and to data tracks interlaced with the alternating data tracks.
    Type: Application
    Filed: April 14, 2015
    Publication date: May 26, 2016
    Inventors: Kaizhong Gao, Wenzhong Zhu, Edward Gage
  • INTERLACED MAGNETIC RECORDING SUPER PARITY
    Publication number: 20160148625
    Abstract: A storage device includes a storage medium having a first set of non-adjacent data tracks having a number of super parity sectors and a second set of non-adjacent data tracks interlaced with the first set of non-adjacent data tracks. The number of super parity sectors on a data track of the first set of non-adjacent data tracks is selected based on a distance between the data track and an inner diameter of the storage medium.
    Type: Application
    Filed: October 9, 2015
    Publication date: May 26, 2016
    Inventors: Wenzhong Zhu, Kaizhong Gao, Tim Rausch, Edward Charles Gage
  • DUAL WRITER HEAD DESIGN
    Publication number: 20160148629
    Abstract: A storage device includes a transducer head with multiple write elements having write poles of different sizes. For example, the transducer head may include two write poles of different width configured to write to a same surface of a storage medium. A controller of the storage device is configured to selectively engage one of the multiple write elements to write data to the storage medium.
    Type: Application
    Filed: April 13, 2015
    Publication date: May 26, 2016
    Inventors: Kaizhong Gao, Edward Gage, Huaqing Yin, Yonghua Chen
  • NON-SEQUENTIAL WRITE FOR SEQUENTIAL READ BACK
    Publication number: 20160147650
    Abstract: A storage device controller addresses consecutively-addressed portions of incoming data to consecutive data tracks on a storage medium and writes the consecutively-addressed portions to the consecutive data tracks in a non-consecutive track order. In one implementation, the storage device controller reads the data back from the consecutive data tracks in a consecutive address order in a single sequential read operation.
    Type: Application
    Filed: April 16, 2015
    Publication date: May 26, 2016
    Inventors: Kaizhong Gao, Wenzhong Zhu, Tim Rausch, Edward Gage
  • HEAT ASSISTED MAGNETIC RECORDING FOR BIT-PATTERNED MEDIA
    Publication number: 20160148635
    Abstract: A heat-assisted magnetic recording (HAMR) device includes a controller that selects a power for operating a heat source for a data write to a target data track. According to one implementation, the controller selects the power based on an assessment of whether the target data track is bounded by any data-storing tracks. A first power is selected when the data track is not bounded by any data-storing tracks and a second lower power is selected when the data track is bounded by one or more data-storing tracks. In another implementation, the controller writes to different partitioned regions of a storage media with different powers of the heat source. The controller selects a storage location for data based on an expected write error rate and environmental conditions within the HAMR device.
    Type: Application
    Filed: June 9, 2015
    Publication date: May 26, 2016
    Inventors: Wenzhong Zhu, Kaizhong Gao, Edward Gage
  • INTERLACED MAGNETIC RECORDING IN HAMR DEVICES
    Publication number: 20160148641
    Abstract: A storage device includes a controller that implements an interlaced magnetic recording scheme with prioritized random access. According to one implementation, a controller is configured to write data at a first linear density to alternating data tracks and write data at a second linear density to one or more data tracks interlaced with the alternating data tracks.
    Type: Application
    Filed: April 14, 2015
    Publication date: May 26, 2016
    Inventors: Kaizhong Gao, Wenzhong Zhu, Edward Gage
  • PRIORITIZED RANDOM ACCESS FOR MAGNETIC RECORDING
    Publication number: 20160148644
    Abstract: A storage device includes a controller that directs incoming data to a storage location based on a capacity of a region or surface of a magnetic disc. According to one implementation, the storage device controller writes new data to data tracks in a first series of data tracks on the magnetic disc until a capacity condition is satisfied. Once the capacity condition is satisfied, the storage device controller writes new data to a second series of data tracks on the storage medium that are interlaced with data tracks of the first series.
    Type: Application
    Filed: April 29, 2015
    Publication date: May 26, 2016
    Inventors: Wenzhong Zhu, Kaizhong Gao, Edward Gage
  • Procedure that achieves a target areal density for a heat-assisted recording medium
    Patent number: 9330688
    Abstract: A recording head writes data to a recording medium for one or more iterations. Each iteration involves adjusting a linear data density, a track pitch, and a laser power. From the iterations, a selected linear data density, a selected track pitch, and a selected laser power are determined that together achieve a target areal density and are used to write user data to the recording medium during operation of a hard disk drive.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: May 3, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Wenzhong Zhu, Kaizhong Gao, Michael A. Cordle
  • Post-write scan operations for interlaced magnetic recording
    Patent number: 9324362
    Abstract: A storage device includes a data degradation management module that tracks a risk of data degradation by incrementing a track write counter of a first data track responsive to each data write command to a second data track, such as a data track directly adjacent to the first data track. If a count of the track write counter exceeds a count threshold, one or more post-write scan operations are performed to assess and/or repair data degradation of the first data track.
    Type: Grant
    Filed: April 16, 2015
    Date of Patent: April 26, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kaizhong Gao, Wenzhong Zhu, Tim Rausch, Edward Gage
  • Reduced spacing recording apparatus
    Patent number: 9299379
    Abstract: Aspects include recording media with enhanced areal density through reduction of head media spacing, head keeper spacing, or head to soft underlayer spacing. Such aspects comprise replacing currently non-magnetic components of devices, such as interlayers and overcoats with components and compositions comprising magnetic materials. Other aspects relate to magnetic seed layers deposited within a recording medium. Preferably, these aspects, embodied as methods, systems and/or components thereof reduce effective magnetic spacing without sacrificing physical spacing.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: March 29, 2016
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Bin Lu, Bogdan Florin Valcu, Xiaoding Ma
  • Data Storage Device with Phase Lock Spin-Torque Oscillation Stabilization
    Publication number: 20160035375
    Abstract: A data storage device can be configured at least with a first spin-torque oscillator disposed between and contacting a write pole and a shield on an air bearing surface. A second spin-torque oscillator can be disposed between and contact the write pole and shield with the second spin-torque oscillator separated from the air bearing surface by a first stabilization distance and from the first spin-torque oscillator by a second stabilization distance. The first and second spin-torque oscillators can be configured to magnetostatically couple and phase lock to produce a single microwave frequency in response to a bias field.
    Type: Application
    Filed: October 9, 2015
    Publication date: February 4, 2016
    Inventor: Kaizhong Gao
  • Data Storage Device with Phase Lock Spin-Torque Oscillation Stabilization
    Publication number: 20160027456
    Abstract: A data storage device can be configured at least with a first spin-torque oscillator disposed between and contacting a write pole and a shield on an air bearing surface. A second spin-torque oscillator can be disposed between and contact the write pole and shield with the second spin-torque oscillator separated from the air bearing surface by a first stabilization distance and from the first spin-torque oscillator by a second stabilization distance. The first and second spin-torque oscillators can be configured to magnetostatically couple and phase lock to produce a single microwave frequency in response to a bias field.
    Type: Application
    Filed: July 27, 2015
    Publication date: January 28, 2016
    Inventor: Kaizhong Gao
  • Template-based magnetic grain-nucleation sites on seed layer
    Patent number: 9245566
    Abstract: A perpendicular magnetic media includes a substrate, a patterned template, a seed layer and a magnetic layer. The patterned template is formed on the substrate and includes a plurality of growth sites that are evenly spaced apart from each other. The seed layer is formed over the patterned template and the exposed areas of the substrate. Magnetic material is sputter deposited onto the seed layer with one grain of the magnetic material nucleated over each of the growth sites. The grain size distribution of the magnetic material is reduced by controlling the locations of the growth sites which optimizes the performance of the perpendicular magnetic media.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: January 26, 2016
    Assignee: Seagate Technology LLC
    Inventors: Shuaigang Xiao, Thomas Young Chang, Yingguo Peng, David S. Kuo, Kaizhong Gao, Thomas P. Nolan, Ganping Ju
  • Write parameters used to ensure accurate phase lock during reading of a heat-assisted magnetic recording medium
    Patent number: 9240205
    Abstract: Based on thermal time constant of a head-to-media spacing of a write head, a write parameter is determined that includes at least one of: a modified laser power boost used at a beginning of writing; and a time adjustment affecting the beginning of the writing. The write parameter is applied to writing operations affecting a heat-assisted magnetic recording medium, the write parameter ensuring accurate phase lock during reading of the heat-assisted magnetic recording medium.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: January 19, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kaizhong Gao, Pu-Ling Lu, Edward Charles Gage, Wenzhong Zhu
  • Plasmonic funnel for focused optical delivery to a magnetic medium
    Patent number: 9230582
    Abstract: An apparatus includes a transducer including a plasmonic funnel having first and second ends with the first end having a smaller cross-sectional area than the second end, and a first section positioned adjacent to the first end of the plasmonic funnel, and a first waveguide having a core, positioned to cause light in the core to excite surface plasmons on the transducer.
    Type: Grant
    Filed: October 3, 2014
    Date of Patent: January 5, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Amit Vasant Itagi, Jie Zou, Kaizhong Gao, Michael Allen Seigler
  • Magnetic layers having granular exchange tuning layer
    Patent number: 9224411
    Abstract: An apparatus includes a first magnetic layer including a plurality of grains. The first magnetic layer has a first anisotropy value. The apparatus also includes a second magnetic layer including a plurality of grains. The second magnetic layer has a second anisotropy value that is different than the first anisotropy value. The apparatus also includes an exchange tuning layer including a plurality of grains and located between the first and second magnetic layers. The exchange tuning layer has stronger inter-granular exchange coupling than the first and second magnetic layers. The exchange tuning layer has an anisotropy value less than the first and second anisotropy values.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: December 29, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kaizhong Gao, Yingguo Peng
  • Multi-sectional parabolic collimating mirror
    Patent number: 9201178
    Abstract: A planar collimator has first and second sections each intersecting at a junction between a first axis and a second axis normal to the first axis. Each of the first and second sections have geometries configured to receive light from a source point located on the first axis and collimate the light at respective positive and negative tilting angles relative to the second axis. The first and second sections direct the collimated light to respective first and second sides of a focusing mirror and away from a gap between the first and second sides of the focusing mirror.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: December 1, 2015
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Kaizhong Gao, Frank Edgar Stageberg
  • UNIT TESTING OF DATA STORAGE DEVICES AT A DATA CENTER
    Publication number: 20150294735
    Abstract: A plurality of data storage devices from a storage device provider are received, at a data center. A tester is received at the data center via the storage device provider. A unit test of the data storage devices is performed at the data center via the tester contemporaneously with using the data storage devices in the data center.
    Type: Application
    Filed: April 11, 2014
    Publication date: October 15, 2015
    Applicant: Seagate Technology LLC
    Inventors: Kaizhong Gao, Dave Aune
  • Data storage device with both bit patterned and continuous media
    Patent number: 9111565
    Abstract: Embodiments of a single data storage device with multiple different data recording media surfaces are disclosed. In one embodiment, at least one of the data recording media surfaces is conventional, such as a continuous or discrete track recording media. Another of the data recording media surfaces is a relatively high areal density, high data rate recording media, such as a bit patterned media (BPM) recording media.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: August 18, 2015
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Olle Heinonen, Wenzhong Zhu
  • Perpendicular Magnetic Recording Media with Magnetic Anisotropy Gradient and Local Exchange Coupling
    Publication number: 20150170697
    Abstract: A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic coercivity Hk extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.
    Type: Application
    Filed: February 24, 2015
    Publication date: June 18, 2015
    Inventors: Shaoping Li, Kaizhong Gao, Lei Wang, Wenzhong Zhu, Xiaobin Wang