Patents by Inventor Tim Rausch

Tim Rausch 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).

  • Laser mode hopping detection method and apparatus for a heat-assisted magnetic recording device
    Patent number: 9583135
    Abstract: An apparatus and method provide for performing, using a heat-assisted magnetic recording head, multiple sequential writes to a recording medium, and recording a metric of write performance for each of the writes. The apparatus and method further provide for calculating fluctuations in the metric, detecting whether the head has a laser mode hopping problem using the metric fluctuations, and categorizing a severity of the laser mode hopping problem.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: February 28, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Minjie Ma, Tim Rausch, Edward Charles Gage, Pu-Ling Lu
  • Heat assisted magnetic recording (HAMR) utilization analysis and reporting system
    Patent number: 9569121
    Abstract: Method and apparatus for managing a data storage system that utilizes heat assisted magnetic recording (HAMR). In some embodiments, the method includes recording data to a storage medium using the HAMR system, accumulating a usage statistic indicative of actual elapsed operation of the HAMR system, and setting an indication value in a memory indicative of an estimate of remaining available elapsed operation of the HAMR system. The estimate of remaining available elapsed operation is determined in relation to the usage statistic and an estimated total elapsed operation value.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: February 14, 2017
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Douglas Murphy, John W. Dykes, Jason Zimmerman, James C. Hatfield
  • System and method for detecting reader-writer offset in a heat-assisted magnetic recording head
    Patent number: 9564157
    Abstract: An apparatus comprises a heat-assisted magnetic recording head configured to write to and read from a magnetic recording medium. The head comprises a reader and a writer including a near-field transducer (NFT). The reader comprises a center which is laterally offset relative to a center of the writer to define a reader-writer offset (RWO) therebetween. A magnetic recording medium comprises a plurality of tracks. The plurality of tracks comprises at least one track used as a region to test for a shift in the RWO. A processor is coupled to the recording head and configured to detect the RWO shift.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: February 7, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jon Trantham, Tim Rausch, Jason C. Jury, Mark Allen Gaertner
  • Determining optical degradation in a heat-assisted read/write head
    Patent number: 9548068
    Abstract: A change in an optical energy profile of energy emitted from a read/write head is determined. The read/write head includes an optical transmission path that emits the energy to heat a heat-assisted recording medium during writing. A change in optical efficiency of the read/write head is also determined. Based on the change in the optical energy profile and the change in the optical efficiency, a change in the effectiveness of the read/write head is determined, and in response a mitigation is performed.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: January 17, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Tim Rausch, Drew Michael Mader, Alfredo Sam Chu
  • Health check for read/write head
    Patent number: 9536550
    Abstract: A cross-track profile of a known good test track on a recording medium is read during operation of a data storage device. Two or more center locations of the test track are determined at two or more different amplitude levels via a read transducer. A health condition of the read transducer is determined by comparing the two or more center locations of the test track with one another.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: January 3, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Minjie Ma, Edmun Seng, Tim Rausch, Edward Charles Gage
  • Determining a HAMR laser power that reduces adjacent track interference
    Patent number: 9536559
    Abstract: A laser power applied to a recording head is changed for a plurality of iterations. Each iteration involves, via the recording head at each laser power, writing multiple adjacent tracks to a heat-assisted recording medium and determining a bit error rate for at least one of the adjacent tracks at each laser power. A first laser power is found that achieves a minimum bit error rate of the iterations. An operational value of laser power that is smaller than the first laser power is used during operational recording to reduce adjacent track interference.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: January 3, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Michael A. Cordle, Tim Rausch, Franklin P. Martens
  • PROCEDURE FOR SETTING LASER AND HEATER POWER IN HAMR DEVICE
    Publication number: 20160343395
    Abstract: A heater power of a heat-assisted magnetic recording head is set to an initial power to induce an initial head-medium clearance. For a plurality of iterations, a heater power at an optimum laser power is determined that achieve a target clearance. If differences in the heater power and optimum laser power between the two subsequent iterations are below a threshold, the iterations are stopped and the heater power and the optimum laser power for one of the two subsequent iterations is used as an operational heater power and laser power for the heat-assisted magnetic recording head.
    Type: Application
    Filed: May 19, 2015
    Publication date: November 24, 2016
    Inventors: Tim Rausch, Tatsuya Shimizu, Wai Yeon Lai, Kai Chiu Cheung
  • Using two or more offset repeatable runout correction values for a virtual track of a magnetic disk
    Patent number: 9502062
    Abstract: First and second repeatable runout (ZAP) values are both located on a first virtual track of a magnetic disk. The first ZAP value is offset from the first virtual track center in a first direction and the second ZAP value is offset from the first virtual track center in a second direction opposite the first direction. At least one of the first and second ZAP values are accessed when performing repeatable runout correction for a writer of the read/write head that is being positioned over a second virtual track of the magnetic disk.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: November 22, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Andrei Dorobantu, Thomas C. Zirps, Tim Rausch
  • Adaptive HAMR laser power data storage device
    Patent number: 9478248
    Abstract: A data storage device and associated methods may provide at least a data storage medium that is separated from a heat assisted magnetic recording data writer and is connected to a controller. The controller can be configured to change a laser power of the heat assisted magnetic recording data writer in response to a tested bit error rate of a median data track of a plurality of adjacent data tracks reaching an identified threshold.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: October 25, 2016
    Assignee: Seagate Technology LLC
    Inventors: Michael A. Cordle, Franklin P. Martens, Alfredo Sam Chu, Shawn Stephen Silewski, Tim Rausch
  • POST-WRITE SCAN OPERATIONS FOR INTERLACED MAGNETIC RECORDING
    Publication number: 20160307595
    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: Application
    Filed: April 1, 2016
    Publication date: October 20, 2016
    Inventors: Kaizhong Gao, Wenzhong Zhu, Tim Rausch, Edward Gage
  • Adjusting track spacing for heat assisted recording medium according to reader to-reader separation
    Patent number: 9460741
    Abstract: Two or more reader sensors are commonly mounted on a read/write head that is configured to read data from a heat-assisted recording medium. For a region of the recording medium, a separation is determined for the reader sensors. A track spacing that provides a target areal density for the region is determined. The track spacing for the region is adjusted to approach a predetermined ratio of the separation.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: October 4, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jon D. Trantham, Tim Rausch, Jason C. Jury
  • System and method for detecting shifting of reader-writer offset in a heat-assisted magnetic recording head
    Patent number: 9418688
    Abstract: A heat-assisted magnetic recording head is configured to write data to and read data from a magnetic recording medium. The head comprises a reader and a writer including a near-field transducer (NFT). The reader comprises a center which is laterally offset relative to a center of the writer to define a reader-writer offset (RWO) therebetween. A controller is configured to control the writer to write data to data tracks of the medium, detect a shift in the RWO, and in response to the detected shift in the RWO, control the writer to write data to a plurality of tracks defining a reserved band during an open period of the reserved band.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: August 16, 2016
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Tong Shirh Stone, Mark Allen Gaertner
  • Data storage device with wear level identification
    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
  • Controlling laser output in a HAMR device
    Patent number: 9355671
    Abstract: A method of controlling laser output in a heat assisted magnetic recording device can be performed by control circuitry in a data storage device. The method includes measuring a temperature, measuring laser output power of a laser, determining a power error by subtracting an optimal laser output power from the measured laser output power and comparing the power error to at least one threshold to determine whether an applied current to the laser needs to be adjusted. The at least one threshold is related to how great the power error can be while maintaining the integrity of data on a recording medium.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: May 31, 2016
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Jon D. Trantham, John W. Dykes, Won Choul Yang
  • LASER POWER OPTIMIZATION FOR HEAT ASSISTED INTERLACED MAGNETIC RECORDING
    Publication number: 20160148637
    Abstract: A storage device disclosed herein stores data on a storage media using interlaced magnetic recording (IMR) and it includes a storage controller configured to determine power levels applied to the power source such that power levels applied to heat various tracks can be different from each other. An implementation of the storage device determines the track density, linear densities and power levels for even and odd tracks in IMR HAMR for the storage media.
    Type: Application
    Filed: July 22, 2015
    Publication date: May 26, 2016
    Inventors: Tim Rausch, Minjie Ma, Kaizhong Gao, Edward Gage
  • VARIABLE WRITTEN TRACK WIDTHS FOR ATTRIBUTE-BASED STORAGE
    Publication number: 20160148643
    Abstract: A storage device controller is configured to select one of multiple written track widths for a storage location based on a write attribute of data to be recorded at the storage location. According to one implementation, the storage device controller is further configured to select a power level for a heat-assisted magnetic recording (HAMR) device based on the write attribute.
    Type: Application
    Filed: April 16, 2015
    Publication date: May 26, 2016
    Inventors: Kaizhong Gao, Wenzhong Zhu, Tim Rausch, Edward Gage
  • LASER POWER OPTIMIZATION FOR HEAT ASSISTED INTERLACED MAGNETIC RECORDING
    Publication number: 20160148636
    Abstract: A storage device disclosed herein stores data on a storage media using interlaced magnetic recording (IMR) and it includes a storage controller configured to determine power levels applied to the power source such that power levels applied to heat various tracks can be different from each other. An implementation of the storage device determines the track density, linear densities and power levels for even and odd tracks in IMR HAMR for the storage media.
    Type: Application
    Filed: July 22, 2015
    Publication date: May 26, 2016
    Inventors: Minjie Ma, Kaizhong Gao, Edward Gage, Tim Rausch
  • ENHANCED CAPACITY RECORDING
    Publication number: 20160148626
    Abstract: A storage device includes a storage controller configured to write a band of data tracks using a first recording method until criterion is met. The first method may be a conventional recording method. After the criterion is met, the storage controller is configured to write data to the band using a second recording method. The second recording method may be an enhanced capacity recording method such as interlaced magnetic recording (IMR) or shingled magnetic recording (SMR).
    Type: Application
    Filed: November 24, 2015
    Publication date: May 26, 2016
    Inventors: Tim Rausch, Minjie Ma, Steven Granz, Kaizhong Gao, Wenzhong Zhu, Edward C. 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
  • 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