For Rotary Carrier (e.g., Disc) Patents (Class 360/78.04)
  • Patent number: 10394288
    Abstract: Example alignment members are provided herein. In one example, the alignment member includes a frame member, a stiffener member, a bracket member, and a spring member. The frame member includes a set of roller bushings. The stiffener member includes a set of cam members. The bracket member to receive the stiffener member. The spring member is connected to the stiffener member. The spring member to expand and contract based on the position of the set of roller bushings.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: August 27, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Kevin Leigh, Sunil Ganta, John Norton, Arlen L. Roesner
  • Patent number: 10353441
    Abstract: Example alignment members are provided herein. In one example, the alignment member includes a frame member, a stiffener member, a bracket member, and a spring member. The frame member includes a set of roller bushings. The stiffener member includes a set of cam members. The bracket member to receive the stiffener member. The spring member is connected to the stiffener member. The spring member to expand and contract based on the position of the set of roller bushings.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: July 16, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Kevin Leigh, Sunil Ganta, John Norton, Arlen L. Roesner
  • Patent number: 10318173
    Abstract: Apparatus and method for managing data transfers in a data storage device with rotational media that can be rotated at different speeds. In some embodiments, a non-volatile main memory is formed on a rotatable medium accessed by a moveable data transducer. A media cache provides a non-volatile data storage area. A control circuit directs writes to the main memory as the medium is rotated at a first speed and directs reads from the main memory as the medium is rotated at a higher, second speed. Writes during the rotation of the medium at the second speed are directed to the media cache instead of to the main memory so that no data are written to the main memory at the second speed. The media cache may also be located on the medium or may be formed from solid-state semiconductor memory.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: June 11, 2019
    Assignee: Seagate Technology LLC
    Inventors: Kian Keong Ooi, Utt Heng Kan, Qiang Bi, Chi Sern Tan
  • Patent number: 10210893
    Abstract: According to an embodiment, a magnetic disk, a magnetic head, an actuator and a processing unit are provided. The processing unit acquires a feature amount from a position error between a demodulated position and an estimated position of the magnetic head based on a frequency resonance characteristic of the actuator or a frequency characteristic of vibration caused by disturbance of the actuator and, based on the feature amount, sets an on-track determination number used for confirming an on-track state of the magnetic head after seeking.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: February 19, 2019
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Hideki Hironaka
  • Patent number: 10204628
    Abstract: Various techniques for speech coding and decoding are disclosed. For example, speech data generated from a speech signal may be decoded by receiving the speech data in a format that has at least one main pulse in a subframe of the speech data, and generating a first predicted pulse that has a lower gain than the main pulse. A second predicted pulse may also be generated as a mirror image of the first predicted pulse on a reverse time scale, on the other side of the main pulse in the subframe of the speech data. The the speech signal may be reconstructed using the first predicted pulse and the second predicted pulse.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: February 12, 2019
    Assignee: Nytell Software LLC
    Inventor: Yang Gao
  • Patent number: 10164691
    Abstract: A method employing linear precoding and non-linear precoding for transmitting data between at least two transmitters and a plurality of receivers via a plurality of communication channels over a plurality of subcarrier frequencies, the method comprising the procedures of transmitting by either one of said at least two transmitters, at least two training signals to respective said receivers; receiving by respective said receivers, said at least two training signals; evaluating channel characteristics of at least part of said communication channels, according to said at least two training signals; determining a precoding scheme selection that defines for at least part of said communication channels, over which of said subcarrier frequencies, said data transmitted shall be precoded using either one of linear precoding and non-linear precoding, according to evaluated said channel characteristics; precoding said data according to determined said precoding scheme selection; and transmitting said data according said
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: December 25, 2018
    Assignee: Sckipio Technologies S.I LTD
    Inventors: Rami Verbin, Rani Keren, Guy Reina
  • Patent number: 10121505
    Abstract: A hard disk device comprises a scanning mechanism that simultaneously scans a first recording medium surface with a first recording head and a second recording medium surface with a second recording head, a table storing band relative position information for a first band on the first recording medium surface and a second band on the second recording medium surface, and a processor. The processor calculates an inter-plane relative trajectory error between the first and second recording heads, determines a data access order performed by the first recording head on the first band and the second recording head on the second band, based on the band relative position information and the inter-plane relative trajectory error, and causes the first recording head to access a track and the second recording head to access a track in the data access order determined by the determining unit.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: November 6, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Kazuto Kashiwagi
  • Patent number: 9917790
    Abstract: A system is configured to use a de-randomizer and budget data structure to economize I/O operations for a shared storage device while still allowing access to the device to a number of different entities. Embodiments can identify a comparatively low cost next operation as compared to other I/O operations, including a cost for seek time, for a first entity to dispatch to the storage device when the first entity has sufficient budget to have the I/O operation performed on its behalf and to identify an I/O operation for a second entity to dispatch to the storage device when there is insufficient budget for the first entity.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: March 13, 2018
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Slava Kuznetsov, Vinod R. Shankar, Andrea D'Amato, Vladimir Petter
  • Patent number: 9886209
    Abstract: A method includes tracking access to files that are stored on a single disk, and identifying a file access sequence involving a first file and a second file stored on the disk, wherein the first file is accessed before the second file. The method further includes determining a time differential between a time that the first file is accessed and a time that the second file is accessed, and determining a direction and speed at which a drive head of the disk can move between sectors and tracks of the disk. Still further, the method includes migrating one or both of the first and second files to a new location on the disk so that, after the drive head of the disk has read the first file, the drive head is repositioned at a beginning of the second file in a period of time that is a function of the time differential.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: February 6, 2018
    Assignee: Lenovo Enterprise Solutions (Singapore) Pte. Ltd.
    Inventors: Shareef F. Alshinnawi, Gary D. Cudak, J. Mark Weber, Joseph F. Herman
  • Patent number: 9710504
    Abstract: A data processing method includes acquiring to-be-stored data in a data table in a columnar database; dividing and/or combining the to-be-stored data according to space of an allocated disk cylinder; and storing same-row data of the to-be-stored data in a same disk cylinder, and in the disk cylinder, successively storing data in each section of columns. Correspondingly, the present disclosure further discloses a data writing method and a related apparatus and device. A technical problem in the prior art that a write speed is slow when a columnar database is running is resolved using the present disclosure, which greatly improves write efficiency of a columnar database. In addition, direct parallel reading or writing may also be implemented by means of hardware marking.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: July 18, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jingting Xia, Liang Ke, Jianjian Huang
  • Patent number: 9685977
    Abstract: A data compressing apparatus includes a polygonal line approximating circuit receiving first time series and outputs second time series by performing a polygonal line approximation process on the first time series. The polygonal line approximating circuit includes a first multiplier and a second multiplier performing multiplication having a first value calculated based on a difference between a time component of first data and a time component of second data in the time series data as input, and a third multiplier and a fourth multiplier performing multiplication having a second value calculated based on a difference between a sensor component of the first data and a sensor component of the second data as input.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: June 20, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Takashi Takemoto
  • Patent number: 9625898
    Abstract: A feedback control system includes at least one servo unit controlling operation of a motor, wherein the at least one servo unit is configured to acquire operational data with respect to controlling the operation of the motor. The feedback control system also includes a programmable logic controller communicatively coupled to the at least one servo unit, wherein the programmable logic controller is configured to receive the operational data from the at least one servo unit and output real-time data corresponding to the operational data.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: April 18, 2017
    Assignee: Honda Motor Co., Ltd.
    Inventors: Hugo Beltran, James Foley
  • Patent number: 9558897
    Abstract: An actuator control method and an actuator control device that incorporate an element of feedback control in time optimal control, including: a calculation step of calculating a switching time at which an acceleration output is switched to a deceleration output and an end time of the deceleration output expressed by time elapsed from a calculation time at which calculation for control is performed using a maximum acceleration and a maximum deceleration, which are measured in advance, at the time of the maximum output of control force of an actuator; a control output step of setting the control force of the actuator to a maximum acceleration output from the calculation time to the switching time, setting the control force of the actuator to a maximum deceleration output from the switching time to the end time, and ending the output of the control force at the end time, and an update step of calculating and updating the switching time and the end time by repeating the calculation step at each preset time.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: January 31, 2017
    Assignee: ISUZU MOTORS LIMITED
    Inventor: Yasushi Yamamoto
  • Patent number: 9378763
    Abstract: Systems and methods are disclosed for positioning of a reader element in a data storage device employing shingled recording. In an embodiment, an apparatus may comprise a processor configured to receive a read command to retrieve data from a data storage medium having data stored in a shingled manner where at least one track is partially overlapped by an adjacent track, and retrieve the data by adjusting a position of a read element according to a track offset compensation value based on a measured parameter. In another embodiment, a method may comprise determining a track offset compensation value for a first area of a data storage medium based on a measured parameter for the area, adjusting a position of a read head based on the track offset compensation value, and reading data from the first area using the read head.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: June 28, 2016
    Assignee: Seagate Technology LLC
    Inventors: Hwajun Kim, Hojoong Choi, Seong Yong Yoon
  • Patent number: 9318146
    Abstract: Methods and apparatuses for generating and using servo correction data are disclosed. In one embodiment, an apparatus may comprise a data storage medium having a first track and a second track, servo correction data for the first track and the second track stored on the first track, and no servo correction data stored on the second track, and a controller configured to correct servo errors based on the servo correction data. In another embodiment a method may comprise receiving servo information related to a first data storage medium having a first track and a second track, generating one or more position error signals (PES) based on the servo information, generating servo correction data based on the one or more PES, and storing the servo correction data for the first track and the second track on the first track.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: April 19, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Hyung Joon Cho
  • Patent number: 9178461
    Abstract: A back electromotive force monitoring circuit has a speed detection voltage generator which biases a back electromotive force generated by a voice coil motor with a predetermined reference voltage to generate a speed detection voltage, and a calculator which generates a motor control signal in accordance with the speed detection voltage. The calculator includes a subtracter which subtracts the reference voltage from the speed detection voltage prior to generation of the motor control signal.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: November 3, 2015
    Assignee: ROHM CO., LTD.
    Inventor: Shinichi Miura
  • Patent number: 9129652
    Abstract: A method and a device for efficient write operations are disclosed, which may be used in connection with shingled magnetic recording (SMR) in order to reduce write amplification (read-modify-write). The tracks on at least one data carrier surface are grouped into bands, and the address space of logical block addresses is divided into address subsets. Each of these address subsets is permanently assigned to a dedicated selection of tracks derived from all bands. Depending on the embodiment, the dedicated selection of tracks may be chosen in such a way that no write amplification occurs in a first phase and/or that recent data or newly added data can be altered without necessitating read-modify-write.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: September 8, 2015
    Assignee: inodyn NewMedia GmbH
    Inventor: Lothar Pantel
  • Patent number: 9129628
    Abstract: Managing data stored in a Data Storage Device (DSD) including at least one disk for storing data. Data is written in a first region of the at least one disk with a first track density. A frequency of access is determined for the data written in the first region, and the frequency of access is compared to a threshold. Based on the comparison, a copy of the data written in the first region is written in a second region of the at least one disk with a second track density different than the first track density.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: September 8, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Robert M. Fallone, William B. Boyle
  • Patent number: 9116190
    Abstract: An apparatus for observing turns and twists in magnetic phenomena including a nonferrous box, a stationary platform set in the middle of the box with a post to support a magnet, a right-hand and a left-hand screws united with coupling and having moving platforms at equal distance from the middle fixed platform with posts to support the specimen, the specimen poized by the magnetic field, and to hover the specimen move the platforms back and forth in continuous and intermittent motions, dc stepper motor to provide the motion, and controlled by power supply, push button switches, and limit switches.
    Type: Grant
    Filed: September 17, 2012
    Date of Patent: August 25, 2015
    Inventor: Ramesh L. Joshi
  • Patent number: 9111560
    Abstract: An apparatus comprises a controller configured to detect a seek failure of a read/write head. The controller is additionally configured to perform a seek recovery operation in accordance with a recovery sequence in response to the seek failure; the recovery sequence comprising a plurality of recovery procedures. Further, the controller is configured to determine if the seek recovery operation is successful and determine which of the recovery procedures provided the success. And, the controller is configured to dynamically calculate the success rate of each recovery procedure, modify the recovery sequence based on the success of the seek recovery operation and based on the success rate of recovery procedures providing the success.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: August 18, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: GuoQing Zhang, Mingzhong Ding, KianKeong Ooi
  • Patent number: 9093095
    Abstract: An apparatus includes: a media; a head over the media; and control circuitry configured to cause the head to: write a first precondition track with a preconditioning pattern on the media, and write a data track on the media at a first inter-track spacing with the head positioned in a first direction from the first precondition track.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: July 28, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Donald Brunnett, Kathy X. Tang, Jerry G. Le
  • Patent number: 9082419
    Abstract: A disk drive is disclosed comprising a head actuated over a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The disk drive further comprises control circuitry including a read channel. The control circuitry configures a power mode of the read channel into a no-op mode, and when the head approaches a servo sector, configures the power mode into a servo mode. After configuring the power mode into the servo mode, the control circuitry waits for a pre-servo gate period, and after the pre-servo gate period, enables a servo gate to read the servo sector. After reading the servo sector, the control circuitry disables the servo gate and waits for a post-servo gate period. After the post-servo gate period, the control circuitry configure the power mode into the no-op mode.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: July 14, 2015
    Assignee: Western Digitial Technologies, Inc.
    Inventor: Steven R. Vasquez
  • Patent number: 9058827
    Abstract: A disk drive is disclosed comprising a servo control system operable to actuate a head over a disk. A sensor signal is filtered with a first filter comprising a frequency response, and the filtered sensor signal is filtered to generate a compensated sensor signal. An error signal is filtered with a second filter comprising the frequency response, and an adaptation control signal is generated based on the compensated sensor signal and the filtered error signal. An adaptive filter is adapted in response to the adaptation control signal, wherein the adaptive filter filters the sensor signal to generate feed-forward compensation values. The feed-forward compensation values are applied to the servo control system to compensate for the disturbance. A disturbance signal that represents the disturbance is generated, and the frequency response of the first and second filters is optimized based on the sensor signal and the disturbance signal.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: June 16, 2015
    Assignee: Western Digitial Technologies, Inc.
    Inventors: Kuang-Yang Tu, Wei Xi, Jianguo Zhou, Teddy T. Chen
  • Patent number: 9058280
    Abstract: A hybrid drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks, and a non-volatile semiconductor memory (NVSM). An access command is received from a host, the access command identifying at least one target logical block address (LBA). When the target LBA is mapped to a target data track on the disk, the head is positioned over the target data track and an accumulated access time is updated for the target LBA. The accumulated access time is compared to a first threshold, and the target LBA is migrated to the NVSM in response to the comparison.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: June 16, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: William B. Boyle, Mei-Man L. Syu, Virgil V. Wilkins
  • Patent number: 9047879
    Abstract: A data storage system according to one embodiment includes a magnetic head, a drive mechanism for passing a magnetic medium over the magnetic head, and a controller electrically coupled to the magnetic head. The data storage system is configured to use at least two different track width formats, where which of the at least two different track width formats used by the system during reading and/or writing of data is selectable. A magnetic tape-based data storage system according to another embodiment includes a magnetic head; a drive mechanism for passing a magnetic recording tape over the magnetic head; and a controller electrically coupled to the magnetic head, wherein the system is configured to use at least two different track width formats, wherein which of the at least two different track width formats used by the system during reading and/or writing of data is selectable.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: June 2, 2015
    Assignee: International Business Machines Corporation
    Inventors: Randy C. Inch, Kevin B. Judd
  • Patent number: 9001454
    Abstract: A disk drive is disclosed comprising a disk comprising tracks defined by servo sectors, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk in response to the servo sectors. The servo control system is configured into a first state, and a position error signal (PES) representing a difference between a target location for the head and a measured location for the head is generated. An actuator control signal is generated in response to the PES, a feed-forward control signal is adapted in response to the servo sectors, and the actuator control signal is adjusted using the feed-forward control signal. The servo control system is configured from the first state to a second state, and a phase of the adaptation of the feed-forward control signal is adjusted based on the second state.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: April 7, 2015
    Inventors: Young-Hoon Kim, Wei Xi
  • Publication number: 20150092297
    Abstract: A portable computing device prevents a magnetic disk unit protecting function from impairing usability for a user when the processor is used as a tablet PC. The portable computing device includes a magnetic disk unit, a magnetic disk unit protecting section operable when predicting an occurrence of an impact to carry out a magnetic disk unit protecting function for retracting a head of the magnetic disk unit, and a detecting section that detects whether a user is holding the portable computing device or not, and responsive to detecting that the user is holding the portable computing device, temporarily deactivating the magnetic disk unit protecting function.
    Type: Application
    Filed: September 29, 2014
    Publication date: April 2, 2015
    Inventors: Kazuhiro Kosugi, Takashi Yomo, Mamoru Okada, Tomoaki Kosugi
  • Patent number: 8988800
    Abstract: Systems and techniques relating to storage devices, such as storage devices that employ Shingled Magnetic Recording (SMR), can include a device, which includes: circuitry configured to write stored data and parity data to discrete portions of a Shingled Magnetic Recording (SMR) track in a SMR storage device; and circuitry configured to recover stored data for one of the discrete portions of the SMR track using the parity data and the stored data read from remaining ones of the discrete portions of the SMR track.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: March 24, 2015
    Assignee: Marvell International Ltd.
    Inventors: Nedeljko Varnica, Gregory Burd, Heng Tang
  • Patent number: 8988811
    Abstract: A disk drive is disclosed comprising a disk, and a voice coil motor (VCM) operable to rotate an actuator arm about a pivot to actuate a head radially over the disk. A voice coil voltage is measured across the voice coil, a velocity command of the VCM is set to substantially zero, an inductor compensation circuit is toggled at least once by enabling and disabling the inductor compensation circuit, the inductor compensation circuit is enabled, the velocity command of the VCM is adjusted, and a control signal is generated and applied to the voice coil in order to move the actuator arm, wherein the control signal is generated in response to the adjusted velocity command, the voice coil voltage, and the estimated inductance voltage.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: March 24, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Jianghong Ding, Duc T. Phan, Robert P. Ryan
  • Patent number: 8988805
    Abstract: A hard disc drive (HDD) of a larger native capacity is clipped to emulate a smaller capacity drive by allocating storage space in tracks in at least both a radially innermost region and radially outermost region of the platter(s). During normal operation, when data is written to or read from the clipped HDD, the actuator arm will move through its entire, normal range of motion, as the read/write heads seek tracks in both the radially inner and outer regions of the platter(s). In some embodiments, storage space is also allocated from tracks in regions interposed between the inner and outer regions. In one embodiment, all tracks on the platter(s) are divided into regions of substantially equal data storage capacity, and the storage space is allocated for the clipped HDD is divided substantially evenly across all the regions.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: March 24, 2015
    Assignee: Toshiba Global Commerce Solutions Holdings Corporation
    Inventors: Brian E. Blair, Donald Johnson
  • Patent number: 8970980
    Abstract: A disk drive is disclosed comprising a disk and a head actuated over the disk. A burst metric is generated in response to a burst read signal. The burst metric comprises at least one of an alpha metric comprising a ratio of a first burst amplitude of a first phased based servo burst measured at a first radial offset to a second burst amplitude of a second phased based servo burst measured at a second radial offset, a harmonic metric comprising a ratio of a first harmonic of the burst read signal as the head is moved radially over the disk to a higher harmonic of the burst read signal as the head is moved radially over the disk, and a spiral track crossing metric comprising a first and second interval each representing a partial duration of the read element crossing a spiral track.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: March 3, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Abhishek Dhanda, Wei Guo, Russ A. Quisenberry, Guoxiao Guo, Jie Yu
  • Patent number: 8964326
    Abstract: According to one embodiment, a first slider of a disk storage apparatus includes a first head and flies over a first recording surface of a first disk. A heater element in the first head projects the first head toward the first recording surface of the first disk depending on heater power. A controller of the apparatus reduces a value for the heater power from a first value to a second value before performing a seek operation of moving the first head such that the first head moves across a concentric circular area including a protrusion on the first recording surface. The controller measures a wait time needed for a flying height of the first head to increase to a first flying height in response to the reduction and starts the seek operation after the wait time elapses.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: February 24, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroshi Sugiyama
  • Patent number: 8937784
    Abstract: A method of operating a disk drive is disclosed wherein the disk drive comprises a disk comprising a plurality of tracks, a head, and a closed loop servo system comprising a seek servo loop and a settle servo loop for actuating the head over the disk. When the head approaches a target track during a seek operation, the settle servo loop is enabled wherein a feedback control signal is generated based on a measured state of the servo system. The feedback control signal is adjusted with a feed-forward compensation. A phase shift between the measured state of the servo system and a corresponding estimated state of the servo system is compensated. The head is settled on the target track in response to the feed-forward compensation.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: January 20, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Kexiu Liu, Orhan Beker, Mingji Lou
  • Patent number: 8922940
    Abstract: A data storage device is disclosed comprising a head actuated over a disk, a spindle motor configured to rotate the disk, and control circuitry configured to perform a power fail operation by boosting a power voltage generated based on the spindle motor to generate a boosted voltage, controlling an operation of the data storage device using the boosted voltage, and when the power voltage falls below a threshold, reducing the boosting so as to reduce the boosted voltage.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: December 30, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventor: Timothy A. Ferris
  • Patent number: 8913342
    Abstract: A data storage device is disclosed comprising a disk, a head, and a microactuator configured to actuate the head over the disk. The data storage device further comprises control circuitry comprising a digital-to-analog converter (DAC) configured to generate a control signal applied to the microactuator. The control circuitry measures an operating temperature and then adjusts a range of the DAC based on the measured operating temperature.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: December 16, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Yanning Liu, Timothy A. Ferris
  • Patent number: 8891194
    Abstract: A disk drive is disclosed comprising a head actuated over a disk. A position y of the head is measured based on servo sectors, and the measured position y of the head is adjusted based on: z1=y+c1(y) where z1 represents a first adjusted position and c1(y) represents first correction values. The first adjusted position z1 is adjusted based on: z2=z1+c2(z1) where z2 represents a second adjusted position and c2(z1) represents second correction values. The first and second correction values are combined based on: c3(y)=c1(y)+c2(y+c1(y)). The measured position y of the head is adjusted based on: z3=y+c3(y) where z3 represents a third adjusted position comprising the adjustment based on c1(y) and the adjustment based on c2(y), and c3(y) represents third correction values.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: November 18, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Sanghoon Chu, Richard K. Wong, Min Chen
  • Patent number: 8879191
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, wherein a maximum radial movement of the head is limited. A plurality of access commands are stored in a command queue, and an access latency is determined for each command in the command queue, wherein the access latency is based at least on a seek latency for the head and a rotational latency for the disk. The access latency for each access command is increased by an offset based at least on a seek length for each access command, wherein the offset compensates for the limited maximum radial movement of the head. An access command is selected from the command queue based on the increased access latencies, and the selected access command is executed.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: November 4, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Edwin S. Olds, Salman A. Nawaz
  • Publication number: 20140313612
    Abstract: There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes: a sleeve supporting a shaft so that an upper end of the shaft protrudes upwardly in an axial direction and a bearing clearance filled with a lubricating fluid formed between the sleeve and the shaft; a housing provided so as to enclose an outer peripheral surface of the sleeve and forming a circulation hole between the housing and the sleeve in the axial direction; and a rotor hub fixedly installed on an upper end portion of the shaft in the axial direction, wherein a connection part is formed between the housing and the rotor hub so as to allow a sealing part on which a liquid-vapor interface is disposed and the circulation hole to be in communication with each other.
    Type: Application
    Filed: August 22, 2013
    Publication date: October 23, 2014
    Applicant: Samsung Electro-Mechanics Co., Ltd
    Inventor: Duck Young KIM
  • Publication number: 20140293478
    Abstract: There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes: a sleeve installed on a base member and having a circulation hole; a shaft inserted into the sleeve; a rotor hub installed on an upper end portion of the shaft; and a thrust member installed in an installation groove formed in an upper portion of the sleeve and forming a connection part, the connection part allowing the circulation hole to be in communication with a sealing part formed by the sleeve and the rotor hub and having a liquid-vapor interface disposed therein, wherein the connection part is formed between the sleeve and the thrust member in a circumferential direction, and at least any one part of the connection part has a radial gap wider than that of another part thereof in the circumferential direction.
    Type: Application
    Filed: July 18, 2013
    Publication date: October 2, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Duck Young KIM
  • Publication number: 20140293477
    Abstract: There are provided a spindle motor and a hard disk drive including the same. The spindle motor includes a sleeve fixedly installed on a base member and including a circulation hole formed in an axial direction; a shaft rotatably inserted into the sleeve; a rotor hub fixedly installed on an upper end portion of the shaft; and a thrust member installed in an installation groove formed in an upper portion of the sleeve in the axial direction and forming a connection part allowing the circulation hole to be in communication with a sealing part formed by the sleeve and the rotor hub and having a liquid-vapor interface, wherein the connection part is formed between the sleeve and the thrust member in a circumferential direction, and a gap on any one side of the connection part in a radial direction is larger than a gap on the other side thereof.
    Type: Application
    Filed: June 13, 2013
    Publication date: October 2, 2014
    Inventor: Duck Young KIM
  • Patent number: 8804274
    Abstract: According to one embodiment, a disk storage apparatus includes a read controller and a servo controller. The read controller contains a combined position generator including a state observer and a combined position calculator. The servo controller controls a seek operation of the head based on the combined position. The servo controller stores the servo information in a memory and determines an occurrence of a state offset as an error between an actual position of the head and the combined position. The servo controller corrects the predicted position by the state observer based on the servo information stored in the memory and the combined position when the occurrence of the state offset is detected.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: August 12, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Takuji Matsuzawa
  • Patent number: 8780479
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of tracks, a head attached to a distal end of an actuator arm, and a voice coil motor (VCM) operable to rotate the actuator arm about a pivot bearing including a race and a plurality of ball bearings. The VCM is controlled to execute a first jerk seek in a first radial direction so that the ball bearings slip within the race by a first rotation angle. The VCM is controlled to execute a second jerk seek in the first radial direction so that the ball bearings slip within the race by a second rotation angle, wherein the second rotation angle adds to the first rotation angle in order to rotate the ball bearings relative to the race at a reference angle of the pivot bearing.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: July 15, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Daniel L. Helmick, Shane Walker, Orhan Beker, Charles D. Richards
  • Patent number: 8780478
    Abstract: Grease wear leveling in a disk drive including an actuator for moving a head over a disk as part of a seek operation. A count of seek operations is maintained and when the count of seek operations exceeds a first threshold number, one or more full stroke seek (FSS) operations are performed until a count of the FSS operations performed reaches a predetermined number. The FSS operation includes moving the head through a substantially wide range of motion. For each of the one or more FSS operations performed, the count of FSS operations performed is adjusted based on whether the most recent FSS operation was performed within a time window. The time window is based at least on a number of interval seek operations performed since a previously performed FSS operation.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: July 15, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Sang Huynh, Kenneth J. Smith, Johnathan C. Lloyd, Chun Sei Tsai
  • Patent number: 8767343
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of data tracks, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk. When an access command is received to access a target data track, a seek operation is initiated to seek the head toward the target data track, wherein the seek operation includes integrating a first state of the servo control system and limiting an output range of the integrating. The output range of the integrating is increased during the seek operation, for example, if an error occurs during the seek operation.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: July 1, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Daniel L. Helmick, Donald Brunnett, Aswartha Narayana, Duc T. Phan
  • Publication number: 20140177095
    Abstract: There is provided a spindle motor, including: a shaft having a fixing groove formed in a lower portion thereof; a lower thrust member including a fixing part inserted into the fixing groove, a disk part extending from the fixing part in an outer radial direction, and an extension part extending from the disk part in an axial direction; a base member coupled to the extension part; a rotating member forming a bearing clearance with the shaft and rotatably provided with respect to the shaft; a first sealing part provided between an upper surface of the extension part and the rotating member; and a second sealing part provided between an inner circumferential surface of the base member and an outer circumferential surface of the rotating member.
    Type: Application
    Filed: March 15, 2013
    Publication date: June 26, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Song Bon OH, Kwan Soo YUN, Kum Kyung LEE
  • Publication number: 20140177096
    Abstract: There is provided a base assembly including: a base member having a disk accommodating part onto which a disk is insertedly disposed; and a filter member installed on the base member so as to be disposed adjacently to the disk, wherein the base member is formed by performing plastic processing on a steel sheet and includes a mounting part for fixedly installing the filter member.
    Type: Application
    Filed: March 28, 2013
    Publication date: June 26, 2014
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Jong Min CHOI
  • Patent number: 8760796
    Abstract: A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks, wherein each track comprises a plurality of servo sectors. When entering an idle mode, the head is floated over the disk, and when exiting the idle mode, a radial velocity of the head is measured, a seek distance is determined in response to the radial velocity, and a seek operation seeks the head the seek distance to a first track.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: June 24, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Mingji Lou, Orhan Beker, Jenghung Chen
  • Patent number: 8760792
    Abstract: Determining the extent of thermally-induced expansion of media of a storage device. A controller may write a second signal on a number of ID and OD sideband tracks of the media immediately adjacent to a center track on which a first signal is written; calculate a jog offset range based on the number of ID and OD sideband tracks; over the calculated jog offset range, read the second signal at a first temperature and at a warmer second temperature and determining a jog value for each of the sideband tracks from a quantity related to the read second signal at the first and second temperatures; and compute a jog delta between the jog values at the first and second temperatures for each of the sideband tracks, which indicate the extent to which thermally-induced media expansion affects a position of the sideband tracks relative to the center track.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: June 24, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventor: Zong Yuan Tam
  • Patent number: 8756399
    Abstract: Method and apparatus for mutably associating logical block addresses to physical blocks. A physical storage space is apportioned into one or more bands. A logical block address (LBA) from a logical space is assigned to one of the bands, and the LBA is mutably associated with a particular physical block (sector) at an associated physical block address (PBA) within the assigned band. Such mutable association preferably includes the writing of user data associated with the LBA to the associated physical sector. During a subsequent operation, user data associated with the LBA can be stored in a second physical sector in the assigned band. The physical storage space preferably comprises a magnetic recording medium, and some or all of the bands preferably utilize overlapping tracks. The logical space is preferably divided into sets of sequential LBAs, with non-adjacent sets assigned to the same band. Map data are used to track sector allocation status in each band.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: June 17, 2014
    Assignee: Seagate Technology LLC
    Inventor: Timothy R. Feldman
  • Patent number: 8737012
    Abstract: An apparatus for use with a hard disk drive, comprising: a selectable notch filter with a selectable notch frequency; a shock sensor of the hard disk drive, coupled to the selectable notch filter, the shock sensor having at least one resonance frequency; a flip flop coupled to an output of the notch filter and an output of the shock sensor; a calibration logic coupled to an output of the flip flop, wherein an output of the calibration logic is coupled to a selection input of the selectable notch filter.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: May 27, 2014
    Assignee: Texas Instruments Incorporated
    Inventor: Daijiro Otani