General Recording Or Reproducing Patents (Class 360/55)
  • Patent number: 10438622
    Abstract: The magnetic tape device includes a magnetic tape; and a servo head, in which the servo head is a TMR head, the magnetic tape includes a servo pattern in the magnetic layer, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and a ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster thereof in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: October 8, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10412183
    Abstract: An electronic device accesses a listening history of a user of a media-providing service, and for each characteristic of a set of characteristics describing tracks provided by the media-providing service, determines a measure of divergence with respect to listening contexts for the listening history of the user. The electronic device identifies a characteristic that has a respective measure of divergence that satisfies a threshold indicative of a lack of uniformity in the listening history with respect to the listening contexts. The electronic device determines a representative value of the identified characteristic for a listening context corresponding to a current listening context of the user. The electronic device provides personalized content to a client device of the user based on the current listening context and representative value of the identified characteristic.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: September 10, 2019
    Assignee: Spotify AB
    Inventors: Clay Gibson, Will Shapiro, Santiago Gil, Ian Anderson, Margreth Mpossi, Oguz Semerci, Scott Wolf
  • Patent number: 10397698
    Abstract: Provided is an audio device, including: an audio signal communication unit comprising a reception unit configured to receive an audio signal via wireless communication and a transmission unit configured to transmit an audio signal via wireless communication; a plurality of signal input units including the reception unit; an input selection unit configured to select one signal input unit from among the plurality of signal input units; a control unit configured to control switching of the input selection unit; and a signal processing unit, in which the control unit is configured to: switch, when the input selection unit has selected a signal input unit other than the reception unit, the input selection unit to the selected signal input unit and input an audio signal, which is input from the selected signal input unit, into the signal processing unit; and switch, when the reception unit has received an audio signal via wireless communication, the input selection unit from the selected signal input unit to the re
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: August 27, 2019
    Assignee: Yamaha Corporation
    Inventors: Katsuaki Tanaka, Masahiro Ishida
  • Patent number: 10388311
    Abstract: A computer-implemented method, according to one embodiment, includes: determining, by the computer, whether a difference between information and corresponding design values is in a range. The information corresponds to how an array of writers write and/or are expected to write to a magnetic medium during shingled recording. Moreover, the computer-implemented method further includes: computing, by the computer and using the information, data describing a lateral writing position to use during writing such that shingled track edges are aligned according to a format in response to determining that the difference between the information and corresponding design values is not in the range.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: August 20, 2019
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, W. Stanley Czarnecki, Ernest S. Gale, Jason Liang
  • Patent number: 10379765
    Abstract: Command scheduling for die sets of non-volatile memory may be performed based on command states of the die sets. Upon receiving an erase command to erase data stored in a first block set of non-volatile memory, a command state of the first die set of the non-volatile memory is determined, where the first die set contains the first block set. If the first die set is determined to be in a pending command state, the erase command is queued in a wait queue. If the first die set is determined to be in an idle command state, the erase command is scheduled to erase the data stored in the first block set.
    Type: Grant
    Filed: August 15, 2017
    Date of Patent: August 13, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: YungLi Ji, Yun-Tzuo Lai, Haining Liu, Yuriy Pavlenko
  • Patent number: 10360928
    Abstract: A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of tracks. A plurality of interlaced recording (IR) zones are defined on the disk, wherein each IR zone comprises a plurality of top tracks partially overlapping a plurality of bottom tracks. First data is written to the bottom tracks of a first IR zone, and the first IR zone is identified as a cold IR zone that is storing cold data. In response to identifying the first IR zone as a cold IR zone, second data is written to the top tracks of the first IR zone.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: July 23, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventor: Richard M. Brockie
  • Patent number: 10332557
    Abstract: A servo sector on a disk is read via first and second readers that both span two or more user data tracks. The servo sector has a crosstrack width that spans the two or more user data tracks. The first reader provides a first signal based on detecting a total longitudinal field of the servo sector. The second reader provides a second signal based on detecting a total perpendicular field of the servo sector. A position error of the first and second readers is detected using. A value of the first signal can be used to detect a position error, detect a track-to-track phase error, and/or detect a Gray code error of a track ID field of the servo sector.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: June 25, 2019
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Puskal Prasad Pokharel, Walter R. Eppler
  • Patent number: 10319904
    Abstract: A magnetoresistance effect element has a first ferromagnetic metal layer, a second ferromagnetic metal layer, and a tunnel barrier layer that is sandwiched between the first and second ferromagnetic metal layers, and the tunnel barrier layer has a spinel structure represented by a composition formula of AIn2Ox (0<x?4), and an A-site is a non-magnetic divalent cation which is one or more selected from a group consisting of magnesium, zinc and cadmium.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: June 11, 2019
    Assignee: TDK CORPORATION
    Inventors: Tomoyuki Sasaki, Katsuyuki Nakada, Tatsuo Shibata
  • Patent number: 10276208
    Abstract: A data storage device is disclosed comprising a head actuated over a disk surface comprising a first magnetic recording layer and a second magnetic recording layer. Data is encoded into a codeword comprising a plurality of non-binary symbols wherein each symbol represents one of a plurality of symbol values comprising a first symbol value, a second symbol value, and a third symbol value. The first symbol value is written to the disk surface by magnetizing the first and second magnetic recording layers, and the second symbol value is written to the disk surface by magnetizing the first magnetic recording layer without substantially affecting the magnetization of the second magnetic recording layer. The encoding into the codeword codes out at least one sequence of symbol values to prevent an ambiguity between detecting the first symbol value and the second symbol value during a read operation.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: April 30, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Zhigang Bai, Yaguang Wei, Terence Tin Lok Lam, Kuok San Ho, Lijie Guan
  • Patent number: 10249332
    Abstract: A magnetic recording medium includes a recording surface comprising a first recording layer having a first ferromagnetic resonant frequency and a second recording layer having a second ferromagnetic resonant frequency. The first recording layer is configured for storing user data and the second recording layer configured for storing servo data. A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer. The recording head arrangement comprises a write pole configured to generate a write magnetic field, and a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency. A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: April 2, 2019
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Lihong Zhang, PengBoon Khoo
  • Patent number: 10244423
    Abstract: A chunk-based scheduling method and a chunk-based scheduling apparatus, capable of improving Quality of Service (QoS) upon the occurrence of congestion in a wireless communication system are provided. The method includes requesting, by a terminal, from a base station for chunk-based scheduling which uses an available bit rate bearer so as to receive chunk that constitutes traffic, and receiving, from the base station, at least one chunk scheduled based on the time limit information of the chunk.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: March 26, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ji-Cheol Lee, Hyung-Ho Lee, Sung-Ho Choi
  • Patent number: 10141013
    Abstract: According to one embodiment, a magnetic disk device including a disk, a head, and a controller which sets a first track pitch based on fringing when a second track is written, sets a second track pitch based on fringing when a third track is written, calculates a difference between the first track pitch and the second track pitch, sets, when the difference is less than or equal to a reference value, an area to which the first track is written in a first recording area, and sets, when the difference is greater than the reference value, the area to which the first track is written in a second recording area.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: November 27, 2018
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Shunsuke Aoki
  • Patent number: 10134433
    Abstract: Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, a C-H derived C concentration calculated from a C-H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %, and ?SFD (=SFD25° C.?SFD?190° C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFD25° C. being SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD?190° C. being SFD measured at a temperature of ?190° C.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: November 20, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10068598
    Abstract: Systems and methods for compensating for hysteresis in a disc drive are described. In one embodiment, a method may use an inverse hysteresis model to linearize effects of hysteresis of a microactuator in the disc drive. The hysteresis model may be a Coleman-Hodgdon hysteresis model. The hysteresis of the microactuator may be characterized, and the inverse hysteresis model may be based at least in part on the characterization. The inverse hysteresis model may be used to implement a digital filter. The digital filter may be employed in series with the microactuator to linearize the effects of hysteresis.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: September 4, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Reed D. Hanson, Kenneth A. Haapala, Dwight R. Kinney, Xinghui Huang
  • Patent number: 10062399
    Abstract: Some embodiments are directed to tape drive systems that oscillate the relative transverse position of the tape and magnetic head during seek operations (for example, by moving the head in the transverse direction). Some embodiments are directed to tape drive systems that select relative transverse position of the tape and magnetic head to counter uneven wear (for example, observed uneven wear, uneven wear predicted based on historical tape and drive usage data).
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: August 28, 2018
    Assignee: International Business Machines Corporation
    Inventors: Marcus Breuer, Bernd Freitag, Frank Krick, Tim Oswald
  • Patent number: 10037167
    Abstract: A non-volatile memory system may include a controller that issues data transfer commands to have data units associated with a host read request transferred from non-volatile memory to a temporary storage area before the data is sent to a host. The controller may be configured to generate a schedule that identifies when the data transfer commands are issued. The schedule may be generated according to one of a plurality of scheduling schemes, each with a different priority in having the data units transferred to the temporary storage area. Which scheduling scheme the controller selects may depend on a queue depth of a read request queue.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: July 31, 2018
    Assignee: SanDisk Technologies LLC
    Inventors: Hyuk-il Kwon, YouMe Lee, SeungBeom Seo, DongHoon Lee, ByongJun Shin
  • Patent number: 10027743
    Abstract: According to one embodiment, a connection control device includes a request acceptor to accept a connection destination determination request transmitted from a first communication device; and a determiner to determine a server being a connection destination of the first communication device from among a plurality of servers. At least one first server among the servers is scheduled to stop running at a first time point. The determiner determines the connection destination of the first communication device in accordance with a number of communication devices connected to each of the servers, based on history information on connection durations by the first communication device with the servers or history information on connection durations by communication devices with the first server, so that a number of the communication devices connected to the first server before the first time point arrives is suppressed.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: July 17, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroshi Kawazoe, Daisuke Ajitomi, Keisuke Minami
  • Patent number: 10025534
    Abstract: Implementations disclosed herein include a method comprising receiving a TRIM request for a media cache in a storage media from a host, determining whether a TRIM range in the TRIM request overlaps with an active operation, invalidating the TRIM range responsive to determining that the TRIM range does not overlap with an active operation, and inserting at least one null node in the media cache. The method may comprise receiving a host read request, performing a media cache search for a read LBA range, and determining where data is located. If all the data is located in the media cache, the system reads from the media cache. If the data is located in a null node, patterning for the null node occurs. If the data is located partially in the main store, the media cache, or a null node, the data may be read, combined, and returned to the host.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: July 17, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Yan Naing, Harry Tiotantra, PohGuat Bay, Thein Than Zaw, CheeHou Peng
  • Patent number: 10008230
    Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which the servo head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder, a binding agent, and fatty acid ester on the non-magnetic support, the magnetic layer includes a servo pattern, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between a spacing measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 9.0 nm.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: June 26, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Tetsuya Kaneko, Norihito Kasada
  • Patent number: 10002625
    Abstract: A recording head has a first magnetic writer and a second magnetic writer offset from the first magnetic writer in a downtrack and crosstrack direction. The recording head has leads configured to deliver respective first and second write and/or laser currents to the first and second writers. The first and second write and/or laser currents enable the first and second writers to simultaneously write to adjacent tracks of a magnetic disk.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: June 19, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Mehmet Fatih Erden
  • Patent number: 9997193
    Abstract: A drive-implemented method according to one embodiment includes determining that unthreading of a tape is to be performed, and in response to the determination that the unthreading of the tape is to be performed, determining whether to write an index on the tape prior to unthreading the tape. In response to a determination to write the index on the tape, the index is written on the tape prior to unthreading the tape. The tape is then unthreaded.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: June 12, 2018
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Masayuki Iwanaga, Yutaka Oishi
  • Patent number: 9984716
    Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: May 29, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Tetsuya Kaneko, Norihito Kasada, Eiki Ozawa
  • Patent number: 9978414
    Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a tilt cos ? of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: May 22, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Tetsuya Kaneko, Norihito Kasada, Eiki Ozawa
  • Patent number: 9953672
    Abstract: A repeatable runout (RRO) is accurately compensated for while moving a magnetic head radially across a disk surface. An iterative learning control algorithm is employed to determine appropriate feed-forward coefficients for an RRO compensation signal for each of a plurality of radial locations across the disk surface. The feed-forward coefficients are determined by performing multiple iterations of continuously moving the magnetic head across the disk surface along a target path while measuring a position error signal that indicates the radial error between the magnetic head and the target path. With each iteration, the iterative learning control algorithm computes new feed-forward coefficients for each of the plurality of radial locations, where the new feed-forward coefficients are selected to reduce the measured position error signal when employed to move the magnetic head along the target path.
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: April 24, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Gabor Szita, Jiangang Liang
  • Patent number: 9952780
    Abstract: An input to read two or more data records stored to a tape medium on a tape drive is received. A starting point is determined. The starting point is a closest data record, of the two or more data records, to a current position of a tape head of the tape drive. A read order of the two or more data records is determined. The read order is determined using an algorithm and the determined starting point. The determined read order is sent to a host device. A first data record is determined. A first locate operation within the tape drive is performed. The first data record, of the two or more data records stored on the tape medium, based on the determined read order is read. The first data record, of the two or more data records stored on the tape medium, is sent to the host device.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: April 24, 2018
    Assignee: International Business Machines Corporation
    Inventors: Kousei Kawamura, Koichi Masuda, Sosuke Matsui, Yutaka Oishi, Takahiro Tsuda
  • Patent number: 9934802
    Abstract: Systems and methods for compensating for hysteresis in a disc drive are described. In one embodiment, a method may use an inverse hysteresis model to linearize effects of hysteresis of a microactuator in the disc drive. The hysteresis model may be a Coleman-Hodgdon hysteresis model. The hysteresis of the microactuator may be characterized, and the inverse hysteresis model may be based at least in part on the characterization. The inverse hysteresis model may be used to implement a digital filter. The digital filter may be employed in series with the microactuator to linearize the effects of hysteresis.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: April 3, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Reed D. Hanson, Kenneth A. Haapala, Dwight R. Kinney, Xinghui Huang
  • Patent number: 9922674
    Abstract: A magnetic recording and reproducing device according to an embodiment includes a magnetic recording medium and a controller. The magnetic recording medium includes in sequence a substrate, a storage layer, an exchange layer, and a surface recording layer. The controller executes following steps (1) to (6): (1) magnetically recording first information on the surface recording layer; (2) transferring the first information recorded on the surface recording layer to the storage layer; (3) magnetically recording second information on the surface recording layer; (4) magnetically reproducing the second information from the surface recording layer; (5) transferring the first information recorded on the storage layer to the surface recording layer; and (6) magnetically reproducing the first information transferred to the surface recording layer.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: March 20, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Kikitsu, Tomoyuki Maeda, Masayuki Takagishi, Kenichiro Yamada
  • Patent number: 9916847
    Abstract: An apparatus comprises a thermal sensor configured to interact with a magnetic recording disk. A head-disk interface is defined between the thermal sensor and the disk. A power supply is coupled to the thermal sensor and configured to supply a bias power to the thermal sensor between a low power and a high power. A processor is coupled to the thermal sensor and configured to determine a slope of a resistance response of the thermal sensor. The processor is further configured to detect a change in the slope relative to a baseline slope. The slope change indicates increased heat sinking between the thermal sensor and the disk due to the presence of contaminant buildup at the head-disk interface.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: March 13, 2018
    Assignee: Seagate Technology LLC
    Inventors: Steven Douglas Granz, Michael Thomas Johnson, Patrick Carl Fletcher, Manuel Charles Anaya-Dufresne, Peng Peng
  • Patent number: 9881637
    Abstract: An apparatus for microwave-assisted magnetic recording includes a magnetic write head operable to write data to a magnetic storage medium. The apparatus includes a spin-torque microwave oscillator coupled to the magnetic write head and operable to provide microwave radiation to the magnetic storage medium. The apparatus includes a driver circuit in communication with the magnetic write head. The driver circuit is operable to dynamically modulate bias current provided to the spin-torque microwave oscillator in sympathy with data being written to the magnetic storage medium by the magnetic write head.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: January 30, 2018
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: Ross Wilson, Andrew Krebs, Jaydip Bhaumik, Greg Starr, Scott O'Brien
  • Patent number: 9837110
    Abstract: Various embodiments provide the position error signal (PES) that is generated by the data read channel that uses internal signals such as analog-to-digital signals, recovered data bits and signals or other internal signals to determine read head off-track metrics. Several different metrics can be utilized including a normalized norm metric, a normalized cross correlation metric, and a cross correlation with detected data metric. These metrics can be utilized to determine off-track shift of one or more read heads such that the read head position can be corrected.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: December 5, 2017
    Assignee: Marvell International Ltd.
    Inventors: Mats Oberg, Gregory Burd, Yifei Zhang, Qiyue Zou
  • Patent number: 9832050
    Abstract: A method of tuning a notch filter in a data storage device (DSD) including the notch filter and a shock detection system includes: adjusting pulse width modulator (PWM) frequency settings of a spindle drive signal; detecting a maximum noise level of an output signal of the shock detection system while adjusting the PWM frequency settings; and selecting a notch filter frequency corresponding to a PWM frequency setting at which the maximum noise level of the output signal of the shock detection system is detected.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: November 28, 2017
    Assignee: Western Digital Technologies, Inc.
    Inventors: Erik J. Eklund, Timothy A. Ferris
  • Patent number: 9824105
    Abstract: A method of indexing in a skip list is disclosed. Key/value pairs are randomly inserted at an appropriate page in a skip list. A new page is created at the lowest level in the skip list. When creating the new page, the page is incremented to a higher level with a write probability. Reading the new page during a search. When reading the new page, the page is incremented to a higher level with a read probability. The read probability is not equal to the write probability.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: November 21, 2017
    Assignee: Hewlett Packard Enterprise Development LP
    Inventor: Ramakumar Kosuru
  • Patent number: 9817579
    Abstract: Systems and methods for maximizing shingled magnetic recording (SMR) drive capacity are described. In one embodiment, the SMR drive may include a main store to store user-accessible data, a media cache and media scratchpad to store internal data temporarily for internal operations, and a storage controller to process read and write requests. In some cases, the main store comprises a shingled media partition and an unshingled media partition. The storage controller may designate one or more data tracks from the shingled media partition as temporary data track guard bands. In some embodiments, a track range is selected based at least in part on at least one of an amount of data in the media cache, a size of the new data in the media cache, and an association between the new data in the media cache and data currently stored within the selected track range.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: November 14, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Xiong Liu, Wenxiang Xie, Sze Chek Tan, Feng Shen
  • Patent number: 9805762
    Abstract: Implementations disclosed herein provide a method comprising comparing high-latency data sectors of a storage band, the high-latency data sectors having latency above a predetermined threshold, with target sectors for storing new data to determine one or more of the high-latency data sectors that may be skipped during retrieval of at-rest data from the storage band.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: October 31, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jian Qiang, Wen Xiang Xie, Libin Cai, Andrew Kowles
  • Patent number: 9779763
    Abstract: A write signal may be adjusted, or modified, based on one or more read signals acquired, or read from, one or more portions proximate a target portion on a storage medium where the write signal is to be applied. The one or more read signals may be read from the storage medium in response to receiving a write data unit such that the read signals may not need to be buffered or later clock synchronized to the write signal.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: October 3, 2017
    Assignee: Seagate Technology LLC
    Inventor: Todd M. Lammers
  • Patent number: 9768895
    Abstract: Embodiments of the present disclosure provide a multipath time delay estimation apparatus and method and a receiver. Time delay is divided into at least two subzones according to cross-correlation values of the transmission signal and the received signal, and time delay estimation is performed on each path in each subzone respectively, thereby efficiently improving resolution of the time delay estimation. And in performing time delay estimation on each path in each subzone, cross-correlation values of other subzones are set to be predefined values, so as to lower influence of strong paths of other subzones on the time delay estimation on each path in the current subzone, thereby efficiently improving accuracy of time delay estimation of weak paths.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: September 19, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Pei Chen, Jianmin Zhou
  • Patent number: 9754628
    Abstract: A first data group in an access sequence is selected. A distance from a current position of the tape medium is set to be a logical distance value, determined by a calculation function, that is substituted for the physical distance value for the data groups that are located in the specified regions as compared with other data groups located in the alternative specified regions. A second data group in the access sequence is selected. The logical distance value is then determined by multiplying a coefficient based on a physical positioning of each of the data groups in the tape medium, and a percentage of those of the plurality of data groups that have already been selected as the first data group and the second data group.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: September 5, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Takashi Katagiri, Yuhko Mori, Masakatsu Murata, Hirokazu Nakayama, Yutaka Oishi
  • Patent number: 9641876
    Abstract: Systems and methods for combining variable bit rate data streams are provided. A plurality of data streams may be identified by a service provider system that includes one or more computers. Each data stream may be a variable bit rate data stream. Based upon an analysis of the respective variable bit rates, the service provider system may determine a subset of the plurality of data streams to be combined. The subset of data streams may then be combined and output by the service provider system for transmission to one or more consumer devices.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: May 2, 2017
    Assignee: Cox Communications, Inc.
    Inventors: Jeffrey L. Finkelstein, Sung-eun Kim, Benny K. Bing
  • Patent number: 9495449
    Abstract: Described is a technology by which a playback list comprising similar songs is automatically built based on automatically detected/generated song attributes, such as by extracting numeric features of each song. The attributes may be downloaded from a remote connection, and/or may be locally generated on the playback device. To build a playlist, a seed song's attributes may be compared against attributes of other songs to determine which other songs are similar to the seed song and thus included in the playlist. Another way to build a playlist is based on similarity of songs to a set of user provided-attributes, such as corresponding to moods or usage modes such as “resting” “reading” “jogging” or “driving” moods/modes. The playlist may be dynamically adjusted based on user interaction with the device, such as when a user skips a song, queues a song, or dequeues a song.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: November 15, 2016
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Lie Lu, Frank Torsten Bernd Seide, Gabriel White
  • Patent number: 9418699
    Abstract: A Data Storage Device (DSD) includes a disk with a zone of tracks to be sequentially written. A sequential write pointer is maintained indicating a next physical location for writing data in the zone. When a write command is received to write data in a target region at a physical location behind the sequential write pointer, it is determined whether a write count for each of the target region and an adjacent region before the target region has reached a threshold number of writes. If it is determined that the write counts for both the target region and the adjacent region have not reached the threshold number of writes, the sequential write pointer for the zone is moved to the physical location and the data is written at the physical location to fulfill the write command.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: August 16, 2016
    Assignee: Western Digital Technologies, Inc.
    Inventors: Kent William Gibbons, Chun Sei Tsai, Choo-Bhin Ong, Kenneth J. D'Souza
  • Patent number: 9406328
    Abstract: In one embodiment, a perpendicular magnetic recording medium includes: a substrate; and a soft magnetic underlayer structure positioned above the substrate, where the soft magnetic underlayer includes: a coupling layer; a first soft underlayer positioned above the coupling layer; and a second soft underlayer positioned below the coupling layer, where a difference between a magnetic flux density of the soft magnetic underlayer structure at 25° C. and a magnetic flux density of the soft underlayer structure at 85° C. is less than or equal to about 10% of the magnetic flux density of the soft magnetic underlayer structure at 25° C.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: August 2, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Shun Tonooka, Masayoshi Shimizu, Hiroyuki Nakagawa, Kiwamu Tanahashi
  • Patent number: 9368135
    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: Grant
    Filed: July 27, 2015
    Date of Patent: June 14, 2016
    Assignee: Seagate Technology LLC
    Inventor: Kaizhong Gao
  • Patent number: 9250254
    Abstract: Embodiments of the disclosure relate to a biosample cartridge that includes radial slots for storing biosample carriers. The biosample cartridge has the same form factor as data tape cartridges used in automated tape libraries to allow the biosample cartridge to be handled by the same robotic mechanisms that handle the data tape cartridges. One aspect of the disclosure concerns a biosample cartridge that includes a rotatable biosample carrier holder. The biosample carrier holder includes radial slots for receiving biosample carriers which contain biosamples scanned and analyzed by automated tape libraries.
    Type: Grant
    Filed: September 30, 2012
    Date of Patent: February 2, 2016
    Assignee: International Business Machines Corporation
    Inventors: Allen K. Bates, Nils Haustein, Stephen L. Schwartz, Anna W. Topol, Daniel J. Winarski
  • Patent number: 9245578
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of data tracks, and a head comprising a first read element and a second read element. The first read element is positioned over a first data track and the second read element is positioned over a second data track. A first analog read signal emanating from the first read element is adjusted based on a second analog read signal emanating from the second read element in order to reduce noise in the first analog read signal due to interference from the second data track.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: January 26, 2016
    Assignee: Western Digital Technologies, Inc.
    Inventors: Alvin J. Wang, Shafa Dahandeh
  • Patent number: 9240198
    Abstract: According to one embodiment, a magnetic disk drive includes a disk including a plurality of servo areas for detecting a positioning error, a head to write and to read data, and a processor. The processor detects a current positioning error of the head on the disk, while writing data to tracks of the disk so as to partially overlap with each other, calculates a predicted positioning error in a next servo area, determinates write inhibit, based on comparison between the current positioning error and a first threshold value, sets the first threshold value to a smaller value being used as the first threshold value to determinate the write inhibit in the next servo area.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: January 19, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Takeyori Hara
  • Patent number: 9202503
    Abstract: According to various embodiments, a lubricating layer for providing lubrication to a magnetic recording medium includes a perfluoropolyether (PFPE) represented by: X—CF2CF2O(C3F6O)mCF2CF2—X, wherein m is in a range from 4 to 8 on average, and wherein X is This lubricating layer may be used in a magnetic disk, which includes a recording layer positioned above a nonmagnetic substrate, a protective film layer positioned above the recording layer, and the lubricating layer positioned above the protective film layer.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: December 1, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Yoshihiko Ooeda, Hiroyuki Matsumoto, Sukefumi Ito, Yoko Saito
  • Patent number: 9189160
    Abstract: Implementations of the present disclosure involve a system and/or method for a target level driver of a host computer to obtain and maintain the state or mode of a physical or virtual tape drive storage system to restore the state of the tape drive storage system. The target level driver monitors one or more commands transmitted to the tape drive system from a user or administrator of the tape drive system. Through analysis and parsing of the one or more commands, the target level driver determines an operational mode state of the tape drive system and stores said mode state. Because the target level driver monitors the commands provided to the tape drive system, the stored operational mode state may include one or more operational modes not reported by the tape drive system.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: November 17, 2015
    Assignee: Oracle International Corporation
    Inventor: Randall Kent Ralphs
  • Patent number: 9171573
    Abstract: A method for operating a tape storage system includes simultaneously receiving readback signals from a set of data readers reading from data tracks of a set of adjacent data tracks extending along a longitudinal extension of a tape storage medium. Each data track has a width and each data reader has a width that exceeds the width of a data track. In the readback signal, of one of the data readers of the set a simultaneous presence of two defined waveforms is detected stemming from two different servo patterns arranged in servo sections of adjacent data tracks of the set. At least one of lateral position, velocity, gain and timing information is derived from a measure of the energy of the two defined waveforms detected in the readback signal of the data reader and applying this information in the operation of the tape storage system.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: October 27, 2015
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Giovanni Cherubini, Simeon Furrer, Jens Jelitto, Mark A. Lantz
  • Patent number: 9157319
    Abstract: The present disclosure describes systems and methods for performing stratigraphic modeling using production data density profiles. At least some illustrative embodiments include a production logging tool data processing method that includes measuring one or more characteristics of a formation within a borehole, of fluids within the formation or of fluids within the borehole, calculating a density profile of each of the one or more characteristics, and defining a boundary between two reservoir simulation cells based at least in part upon the density profile. The method further includes performing a simulation of a production field including the borehole using said simulation cells and presenting the simulation results to a user.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: October 13, 2015
    Assignee: LANDMARK GRAPHICS CORPORATION
    Inventors: Jeffrey Marc Yarus, Marko Maucec, Gustavo Carvajal, Genbao Shi, Richard L Chambers
  • Patent number: 9159339
    Abstract: A magnetic device includes a write element having a write element tip that defines a medium confronting surface. The write element is operable to generate a first field at the medium confronting surface. A conductor is proximate the write element tip and first and second conductive leads are connected to the conductor and configured to deliver a current to the conductor to generate a second field that augments the first field. First and second side elements are disposed on opposite sides of the write element tip in a cross-track direction at the medium confronting surface. At least a portion of the first conductive lead is disposed adjacent the first side element on a side opposite the medium confronting surface, and at least a portion of the second conductive lead is disposed adjacent the second side element on a side opposite the medium confronting surface.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: October 13, 2015
    Assignee: Seagate Technology LLC
    Inventors: Werner Scholz, Thomas William Clinton, Sharat Batra, Mark Thomas Kief, Eric S. Linville, Wei Peng, Kenneth A. Medlin