Rotary Carrier Patents (Class 360/73.03)
  • Patent number: 10714133
    Abstract: A data storage device is disclosed comprising a first actuator configured to actuate a head over a disk, a second actuator configured to rotate the disk, a first control circuit configured to generate a servo command, and a second control circuit configured to receive the servo command from the first control circuit, control the first actuator or the second actuator using the servo command, and override the servo command to avoid an overcurrent condition.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: July 14, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: Brian Johnson, Ryan Mayo, Jaesoo Byoun
  • Patent number: 10242698
    Abstract: A data storage device is disclosed comprising a head actuated over a disk, and a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings. During a power failure the head is unloaded by generating a periodic signal, shorting the windings of the spindle motor based on the periodic signal in order to generate a power voltage, and adjusting the periodic signal based on an amplitude of the power voltage.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: March 26, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Jaesoo Byoun, Brian A. Johnson, Timothy A. Ferris
  • Patent number: 10043554
    Abstract: A periodic rotational vibration check for storage devices to compensate for varying loads is disclosed. A variable representing rotational vibration status is maintained in a rotational vibration log. The variable is processed to determine whether a storage device exhibits a rotational vibration issue. Workload analysis is performed to identify a change to the workloads run on physically separate hardware to resolve the rotational vibration issue and thus eliminate the need for more expensive hardware.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: August 7, 2018
    Assignee: International Business Machines Corporation
    Inventors: Brian James Cagno, Kenton Coleman Green, Carl Evan Jones, Michael Desmond O'Connell
  • Patent number: 10024758
    Abstract: An abnormality detecting device and method for detecting a symptom of a failure of a spindle of a machine tool before the spindle malfunctions. The abnormality detecting device for detecting an abnormality or malfunction includes a spindle motor and a motor controller. The motor controller includes a time measuring part which measures a spindle stopping time from when a free-run of the spindle motor accelerated to a predetermined number of rotations is started to when the spindle motor is stopped, a storing part which stores the spindle stopping time measured by the time measuring part, and a comparing part which compares a plurality of data with respect to the spindle stopping time stored in the storing part, and judges as to whether or not an abnormality exists in the spindle or the spindle motor.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: July 17, 2018
    Assignee: FANUC CORPORATION
    Inventor: Yohei Kamiya
  • Patent number: 9842620
    Abstract: A motor includes a rotating portion including a rotor magnet, and arranged to rotate about a central axis extending in a vertical direction; a bearing mechanism arranged to support the rotating portion such that the rotating portion is rotatable about the central axis; a stator portion arranged opposite to the rotor magnet; a housing arranged to accommodate the rotating portion, the bearing mechanism, and the stator portion therein; and a sealing member. The housing includes a base portion substantially in a shape of a plate and arranged to extend radially below the rotating portion. The base portion includes a first lower surface arranged to face downward, and a through hole arranged to pass through the base portion in the vertical direction and arranged to have a portion of the bearing mechanism arranged therein. The sealing member is arranged to cover a lower side of the through hole, and includes at least a metal layer.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: December 12, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Katsuya Takahashi, Masahiro Shiraishi
  • Patent number: 9772942
    Abstract: A computing system includes a processor that has a processor cache built-in, and a non-volatile memory, such as a non-volatile dual-inline memory module (NVDIMM), which is being used as system memory within the computing system. The processor processes a transaction. If the computing system is connected to an uninterruptible power supply (UPS) (and the UPS is connected to a mains power source that is currently providing power), the transaction is committed without first flushing the processor cache to the non-volatile memory. If the computing system is not connected to a UPS (and is connected to a mains power source that is currently providing power), the transaction is not committed until the processor cache has been flushed to the non-volatile memory.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: September 26, 2017
    Assignee: Lenovo Enterprise Solutions (Singapore) PTE., LTD.
    Inventors: Sumanta Kumar Bahali, John K. Langgood, Kevin Michael Reinberg, Kevin S. Vernon
  • Patent number: 9721608
    Abstract: A motor includes a rotating portion including a rotor magnet, and arranged to rotate about a central axis extending in a vertical direction; a bearing mechanism arranged to support the rotating portion such that the rotating portion is rotatable about the central axis; a stator portion arranged opposite to the rotor magnet; a housing arranged to accommodate the rotating portion, the bearing mechanism, and the stator portion therein; and a sealing member. The housing includes a base portion substantially in a shape of a plate and arranged to extend radially below the rotating portion. The base portion includes a first lower surface arranged to face downward, and a through hole arranged to pass through the base portion in the vertical direction and arranged to have a portion of the bearing mechanism arranged therein. The sealing member is arranged to cover a lower side of the through hole, and includes at least a metal layer.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: August 1, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Katsuya Takahashi, Masahiro Shiraishi
  • Patent number: 9653110
    Abstract: Embodiments generally relate to data storage in a computing system. The present technology discloses techniques that that can enable an optimized mechanism to change spinning speed of data storage disk drives. The present technology can use a service controller, e.g. a Baseboard Management Device (BMC), to communicate with a disk controller to change the spinning speed of disk drives. The present technology can improve energy efficiency by efficiently controlling the spinning speed of disk drives. It can also reduce data access latency by promptly spinning up a disk from a spun-down state.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: May 16, 2017
    Assignee: QUANTA COMPUTER, INC.
    Inventor: Yung-Fu Li
  • Patent number: 9584059
    Abstract: A motor control system is presented. The motor control system includes a motor controller and a motor driver. The motor controller and motor driver are coupled by an interface which includes a conductor configured to carry both a motor speed control signal from the motor controller to the motor driver and a motor feedback signal from the motor driver to the motor controller. The motor controller provides a motor speed control signal to the motor driver and the motor driver provides a motor feedback signal to the motor controller.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: February 28, 2017
    Assignee: Allegro Microsystems, LLC
    Inventors: Timothy Reynolds, Dennis Hwang, Walter Kim, Thomas Rowan
  • Patent number: 9577884
    Abstract: Embodiments of the invention are directed to a system, method, or computer program product for configuring multiple computing devices over a network using a single software application. Each of the multiple computing devices may be accessible over a network. The invention links each of the multiple computing devices to the single software application. The invention determines commands which are executable by each of the multiple computing devices to configure each of the multiple computing devices. The invention further communicates the commands based on receiving user input in the single software application. The invention then determines whether each of the multiple computing devices were correctly configured. The invention may further track the configuration process of the devices using tests and procedures. The invention tracks information related to the configuration of the devices and displays such information in report form as a result of receiving a report request in the single software application.
    Type: Grant
    Filed: January 1, 2015
    Date of Patent: February 21, 2017
    Assignee: Bank of America Corporation
    Inventors: Vivek Kumar, Sushil Kumar, Hitendra Kumar
  • Patent number: 9557800
    Abstract: The present disclosure includes apparatuses and methods for sequence power control. A number of embodiments include executing a number of sequences associated with a number of commands, wherein a number of logical unit (LUN) controllers execute the number of sequences by locating power consumption information and a starting address of the number of sequences stored in a data structure on the number of LUN controllers.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: January 31, 2017
    Assignee: Micron Technology, Inc.
    Inventor: Laszlo Borbely-Bartis
  • Patent number: 9535484
    Abstract: Methods of extending runtime with battery ripple cancellation in a CPU based system by providing a CPU that includes an input pin capable of throttling the power consumed by the CPU responsive to the input of a throttling signal, sensing a ripple in the form of a decrease in voltage or an increase in current responsive to a load on a CPU power supply, and when the ripple exceeds a predetermined limit, providing a throttling signal to the input pin to throttle the CPU to reduce the ripple.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: January 3, 2017
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Jason Allen Wortham
  • Patent number: 9529193
    Abstract: The device for operating one or more optical display devices of a vehicle is configured to determine a three-dimensional model for a predefined environment of the vehicle depending on data sets provided and depending on a predefined latency time, wherein the data sets represent predefined vehicle information and/or driving information which is suitable for being signaled graphically and/or pictorially to a vehicle user.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: December 27, 2016
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Axel Schwab, Wolfgang Rieger
  • Patent number: 9496708
    Abstract: An isolation circuit is coupled between motor driver half bridge circuits and an electric motor. A motor controller circuit supplies motor drive signals to the motor driver half bridge circuits. The isolation circuit includes transistors coupled in series with the motor windings. Low to medium power diodes are coupled between a reference voltage source and control terminals of the transistors.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: November 15, 2016
    Assignee: Allegro MicroSystems, LLC
    Inventors: Edward Chappell, Robert D. Christie, James McIntosh, Peter Morris
  • Patent number: 9483107
    Abstract: In embodiments of adaptive idle timeout for storage devices, a computing device includes a storage device that stores data for read and write access on a rotating media. An operating system of the computing device maintains a device cycle number as an accounting of each time the storage device is powered on-off. The computing device implements a storage device driver that is implemented to obtain the device cycle number of the storage device from the operating system, and determine a projected cycle number over a duration of operational time of the storage device based on the device cycle number. The storage device driver can then determine whether the projected cycle number exceeds a maximum of power on-off cycles within a warranty period of the storage device, and control a frequency of the storage device being powered-off if the projected cycle number exceeds the maximum of power on-off cycles.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: November 1, 2016
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Tristan Charles Griffith, James C. Bovee, Bruce J. Sherwin, Jr., Tobias Marius Klima, Philipp Ruilin Liu
  • Patent number: 9403445
    Abstract: A motor controller includes a motor, an encoder, and a control circuit. The motor drives a target object to be controlled. The encoder outputs a pulse signal synchronously with rotation of the motor. The control circuit rotates the motor based on a count value of the pulse signal. The control circuit switches to a sleep mode when making sure that a rotation position of the motor is stable after finishing rotating the motor or when a predetermined time necessary for the rotation position of the motor to be stable elapses after finishing rotating the motor. When a change in the pulse signal during a period of time where the control circuit is in the sleep mode is not smaller than a predetermined amount, the control circuit performs a learning process to learn a reference position of the motor when returning to a wakeup mode from the sleep mode.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: August 2, 2016
    Assignee: DENSO CORPORATION
    Inventor: Jun Tarui
  • Patent number: 9373354
    Abstract: Systems and methods for reducing problems and disadvantages associated with protecting data during cold excursions are provided. A method for preventing unreliable data operations at cold temperatures may include determining whether a first internal temperature of a hard disk drive (HDD) is below a threshold temperature. The method may also include initiating an artificial seek operation if the first internal temperature is below the threshold temperature.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: June 21, 2016
    Assignee: Dell Products L.P.
    Inventor: Clinton Allen Powell
  • Patent number: 9367405
    Abstract: A method is used in managing software errors in storage systems. It is detected that a first processor of a storage system has a problem performing an I/O on a logical object. The first processor has a first path to the logical object. The problem includes a software error. Whether responsibility of performing the I/O on the logical object is transferred to a second processor of the storage system is evaluated. The second processor has a second path to the logical object.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: June 14, 2016
    Assignee: EMC Corporation
    Inventors: Robert P. Foley, Peter Puhov, Marc C. Cassano, Daniel E. Cummins, David W. Harvey
  • Patent number: 9355676
    Abstract: A data storage device is disclosed comprising a disk, a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings, and a head actuated over the disk. The windings of the spindle motor are commutated based on a commutation sequence while applying a periodic driving voltage to each winding, wherein the periodic driving voltage comprises an operating amplitude during normal operation. When a supply voltage falls below a threshold, the spindle motor is configured into a power generator by at least adjusting the amplitude and a phase of the periodic driving voltage so that a periodic current flowing through each winding is substantially opposite in phase from a sinusoidal back electromotive force (BEMF) voltage generated by each winding.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: May 31, 2016
    Assignee: Western Digital Technologies, Inc.
    Inventors: Michael Troy Nicholls, Joseph J. Crowfoot
  • Patent number: 9313263
    Abstract: Techniques for assigning applications to datastores in a virtual machine environment are disclosed. In an embodiment, applications exhibiting different I/O data access patterns are assigned to datastores by collecting data related to the input-output operations performed by the applications, analyzing the collected data to identify corresponding data access patterns, and assigning applications to datastores based on the identified data access patterns. In this way, applications can be segregated by data access pattern onto separate datastores. For example, random I/O apps and sequential I/O apps can be assigned to different datastores. Additionally, if random I/O apps are found to be comingled with sequential I/O apps on the same datastore, then data associated with the applications can be migrated as necessary to achieve segregation. In an embodiment, random I/O apps and sequential I/O apps are segregated onto datastores that rotate independent of each other.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: April 12, 2016
    Assignee: VMware, Inc.
    Inventors: Prasenjit Sarkar, Vineet Kumar Sinha
  • Patent number: 9286932
    Abstract: A hard disk drive includes a storage surface, a motor, a read/write had, and a number of regions into which the storage surface is divisible. Data is writable to and data is readable from the storage surface. The motor is to rotate the storage surface at a variable speed. The read/write head is to write data to and read data from the storage surface while the storage surface is rotated by the motor. Each region corresponds to a different speed at which the storage surface is rotated for the read/write head to write data to and read data from the region.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: March 15, 2016
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Eric A. Anderson, Arif A. Merchant
  • Patent number: 9256275
    Abstract: Devices and methods for power management during media playback are provided. For example, an electronic device according to an embodiment may include storage, a decoder, an output buffer, and data processing circuitry. The storage may store compressed media data that may be decoded by the decoder. The output buffer may store the decoded media data before the decoded media data is played out. The data processing circuitry configured may measure a fullness of the output buffer and may set an operating frequency of the storage, the decoder, the output buffer, or the data processing circuitry, or a combination thereof, depending on a format of the compressed media data and the fullness of the output buffer.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: February 9, 2016
    Assignee: Apple Inc.
    Inventors: Aram Lindahl, Saurabh Gupta, Wang Chun Leung, Richard Michael Powell, Joseph M. Williams
  • Patent number: 9230592
    Abstract: An apparatus includes: a disk; a spindle motor configured to rotate the disk; and control circuitry with a spindle motor control loop, coupled to the spindle motor, the control circuitry configured to: inject a bandwidth test frequency into the spindle motor control loop, measure an open loop gain of the spindle motor control loop, calculate, using coordinate transformations, an estimated loop bandwidth of the spindle motor control loop based at least on one iteration of the bandwidth test frequency injection and the open loop gain measurement, and generate optimum loop parameters of the spindle motor control loop.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: January 5, 2016
    Assignee: Western Digital Technologies, Inc.
    Inventors: Zhou Yong, Jie Wan, Shuyu Cao, Jianghong Ding, Jern Khang Tan
  • Patent number: 9171568
    Abstract: A data storage device is disclosed comprising a disk comprising timing data, a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings, and a head actuated over the disk. A phase of a commutation controller is initialized based on the timing data on the disk, and a commutation sequence of the commutation controller is driven based on the timing data on the disk, wherein the commutation controller is configured to commutate the windings based on the commutation sequence. The phase of the commutation controller is re-initialized based on the timing data on the disk, thereby compensating for a cumulative phase error when driving the commutation sequence based on the timing data on the disk.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: October 27, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Michael T. Nicholls, Philip Tin Yue Ng
  • Patent number: 9147428
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor operable to rotate the disk. The disk drive comprises control circuitry configured to a rotation speed of the spindle motor, generate a gain as a function of the measured rotation speed, wherein the function comprises a polynomial having a degree greater than one, and spin-up the spindle motor based on the gain.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: September 29, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Charles J. Calaway, Wenli Yang, Ashok K. Desai, Jinsik Kim, Jianghong Ding
  • Patent number: 9099101
    Abstract: Described herein is a method for controlling the acoustic noise generated by a spindle motor of a hard disk drive includes detecting vibrations of the hard disk drive, and distorting an input signal to the spindle motor based on the vibrations of the hard disk drive.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: August 4, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Masaki Kudo, Takahisa Takahashi
  • Patent number: 9076490
    Abstract: A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral seed tracks. The head is positioned at a first radial location over the disk, and the head is servoed over the disk in response to the spiral seed tracks starting from the first radial location in order to write a first spiral servo track on the disk. The head is positioned at a second radial location over the disk different from the first radial location, and the head is servoed over the disk in response to the spiral seed tracks starting from the second radial location in order to write a second spiral servo track on the disk.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: July 7, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Jianbin Nie, Edgar D. Sheh, Siri S. Weerasooriya
  • Patent number: 9076472
    Abstract: An apparatus is disclosed comprising control circuitry configured to measure a rotation speed of a disk over multiple revolutions of the disk to generate a measured range of rotation speeds, select a target rotation speed from the measured range of rotation speeds, and when the rotation speed of the disk substantially matches the target rotation speed, enable writing of servo data on the disk using a head.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: July 7, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Paul Dylan Sherman, Sergey Muchiyev
  • Patent number: 9035666
    Abstract: A torsion angle and rotation angle measurement device includes an input rotation disk, an output rotation disk, at least two torsion measuring modules and a rotation measuring module. The output rotation disk is coaxially and rotatably connected with the input rotation disk. At least two torsion measuring modules are disposed between the input rotation disk and the output rotation disk. Each torsion measuring module includes a rotary variable resistor and a torsion measuring arm. The rotary variable resistor is disposed on the output rotation disk. The torsion measuring arm is pivotally connected with the rotary variable resistor at a first end thereof, and is slidably connected with the input rotation disk at an second opposite end. When the input rotation disk rotates relative to the output rotation disk, the rotary variable resistor measures an angle indicating the input rotation disk rotating relative to the output rotation disk.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: May 19, 2015
    Inventor: Chieh Chi Chen
  • Patent number: 9025270
    Abstract: An apparatus includes: a media motor; a media mounted on the media motor; a head, over the media, the motion of the head controlled by a head actuation motor; a motor driver, coupled to the media motor, configured to adjust a media speed; and control circuitry configured to: coast the media motor in preparation for accelerating the head, and activate the head actuation motor including accelerating the head in a first direction for repositioning the head over the media.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: May 5, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Shane G. Nowell, Wayne H. Vinson, Danny J. Kastler
  • Patent number: 9025261
    Abstract: A mechanism is provided for determining storage device speed based on a ratio of data compression. A bandwidth (B) is identified between a storage device accessing storage medium and a host application requesting access to data on the storage medium. A host side transfer rate is identified, where the host side transfer rate (HSTR) is a rate of data transfer between the host application and the storage device. For each data set in a set of data sets of a record, a ratio of data compression (R) is identified for the data set; a compression considered host side transfer rate (CCHSTR) is determined; and the storage device speed is set to the compression considered host side transfer rate (CCHSTR) for transmitting the data set to the host application.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: May 5, 2015
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Yutaka Oishi
  • Patent number: 9001449
    Abstract: Some embodiments of the invention are directed to a data storage system that includes a disk and solid-state non-volatile memory (NVM). During a power failure, the data storage system may use back EMF (BEMF) voltage from the spindle motor of the disk to park the heads of the disk and/or store data in the NVM. In one embodiment, a demand regulation circuit regulates loads that use voltage generated from the BEMF. The demand regulation circuit may be used to selectively cause a controller to adjust the rate of programming to the NVM in order to reduce the load. For example, the demand regulation circuit may assert a throttle signal to the controller upon detecting that the voltage generated from the BEMF is below a certain threshold. Programming rate may be throttled, programming cycles may be staggered, and/or programming time may be lengthened. Throttling may enable the use of smaller circuitry.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: April 7, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: George J. Bennett, Steven R. Vasquez, Robert P. Ryan
  • Patent number: 8982501
    Abstract: A data storage device is disclosed comprising a head actuated over a disk, and a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings. A commutation controller is configured to commutate the windings based on a commutation sequence. Compensation values are generated based on: A1 sin ?1t+B1 cos ?lt where A1 and B1 are adaptable coefficients and ?1 represents a first frequency based on a first mechanical parameter of the spindle motor. The compensation values are used to drive the commutation sequence of the commutation controller.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: March 17, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Michael T. Nicholls, Timothy A. Ferris
  • Publication number: 20140376125
    Abstract: A control system for a group of hard disks includes a power supply and a connecting module. The power supply supplies power for the group of hard disks. The connecting module couples the power supply to the group of hard disks. The group of hard disks has a number of hard disks. When the connecting module is coupled between the power supply and the group of hard disks, a staggering spin-up function of the plurality of hard disks is activated.
    Type: Application
    Filed: June 24, 2014
    Publication date: December 25, 2014
    Inventors: MIN ZHOU, HUI LI
  • Publication number: 20140340783
    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: Application
    Filed: May 15, 2013
    Publication date: November 20, 2014
    Applicant: ROHM CO., LTD.
    Inventor: Shinichi MIURA
  • Publication number: 20140320998
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor operable to rotate the disk. The spindle motor operates according to a plurality of electrical cycles over a single revolution of the spindle motor, where each electrical cycle spans a cycle period. A plurality of the cycle periods are measured, at least two of the cycle periods are combined, and a rotation speed of the spindle motor is measured based on the combined cycle periods.
    Type: Application
    Filed: April 24, 2013
    Publication date: October 30, 2014
    Applicant: Western Digital Technologies, Inc.
    Inventor: Western Digital Technologies, Inc.
  • Publication number: 20140313611
    Abstract: A control circuit for a hard disk drive (HDD) includes a control chip, a connector connected between the control chip and a motherboard, and a function transform circuit connected between the control chip and the connector. A status pin of the control chip is connected to a status receiving pin of the connector through the function transform circuit, to send a working state signal of the hard disk drive to the status receiving pin of the connector. The status receiving pin shows a normal operation of the HDD through a light emitting diode connected to the status receiving pin. The function transform circuit provides a high level signal to a staggered spin-up pin of the control chip, to make the control chip control the hard disk drive to execute staggered spin-up function.
    Type: Application
    Filed: June 27, 2013
    Publication date: October 23, 2014
    Inventors: BO TIAN, KANG WU
  • Patent number: 8804269
    Abstract: A HDD including a temperature sensor for sensing ambient temperature in the HDD, a spindle motor comprising a fluid dynamic bearing; and a controller configured for adjusting a rotational speed of the spindle motor based on the measured ambient temperature while a rigidity of the fluid dynamic bearing is maintained, and reducing power consumption of the HDD based on the adjusting the rotational speed of the spindle motor.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: August 12, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Takao Suzuki, Kohji Takahashi, Tomoki Hiramatsu, Toshihisa Kiyonaga
  • Patent number: 8804267
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor operable to rotate the disk. A baseline relationship is generated between a baseline current draw of the spindle motor over a temperature range. An operating current draw of the spindle motor is measured and a corresponding operating temperature is measured. Failure of the spindle motor is predicted based on the operating current draw, the operating temperature, and the baseline relationship.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: August 12, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Yanan Huang, Chuanwen Ji, Duc T. Phan, Chui Lyn Cheong
  • Patent number: 8767337
    Abstract: Systems and methods from loading/unloading a data head for a disk drive provide for more efficient use of disk space. A method of loading/unloading a data head for a disk drive comprises determining a disk phase of a spinning disk arrangement, determining a loading/unloading position based on the disk phase, and loading or unloading the data head on or from, respectively, the spinning disk arrangement based on the determined disk phase. The determining a disk phase may be based on zero crossing of voltages for a three-phase motor associated with the spinning disk arrangement.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: July 1, 2014
    Assignee: Seagate Technology
    Inventors: Craig Smith, Bernhard Hiller, Stan Shepherd, Erhard Schreck
  • Patent number: 8743502
    Abstract: A disk drive comprising a head actuated over a disk, and control circuitry operable to spin the disk at a first spin rate. The control circuitry is further operable to reduce the spin rate of the disk from the first spin rate to a second spin rate, wherein the second spin rate is based on a spin-up parameter associated with spinning up the disk from the second spin rate to the first spin rate. For example, the spin-up parameter may comprise one or more of a spin-up time limit, power setting, and ambient temperature.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: June 3, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Carl E. Bonke, Daniel D. Reno, Nathan J. Santee
  • Patent number: 8737008
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, a spindle motor for rotating the disk, and a spindle motor control system comprising a servo compensator operable to generate a control signal applied to the spindle motor, the servo compensator comprising a programmable gain term (PGT). The disk is spun at a first speed RPM—1 using a first value PGT—1 selected for the PGT, and the disk is spun at a second speed RPM—2 using a second value PGT—2 selected for the PGT, wherein the second value PGT—2 is generated in response to the first value PGT—1 scaled by a function of a ratio of RPM—2 to RPM—1.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: May 27, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Taylor Watanabe, Wenli Yang, Ashok K. Desai, William T. Stoll, Angel Yu
  • Publication number: 20140078610
    Abstract: A motor drive device has: a power supply line to which a power supply voltage is applied; a ground line to which a ground voltage is applied; and a first motor driver that, when the power supply voltage is normal, rotates an N-phase first motor (where N is an integer of 2 or more) by using the supply voltage and, when the power supply voltage is abnormal, generates a rectified voltage from phase voltages of different phases appearing while the first motor is idling to regenerate the rectified voltage to the power supply line. The first motor driver, when generating the rectified voltage, boosts the rectified voltage by periodically repeating a brake cycle to make all the terminals of the different phases of the first motor conduct to the ground line and a boost cycle to rectify the phase voltages of the different phases synchronously while making at least one of the terminals of the different phases conduct to the power supply line.
    Type: Application
    Filed: September 20, 2012
    Publication date: March 20, 2014
    Applicant: ROHM CO., LTD.
    Inventor: Yoshito OTAGURO
  • Publication number: 20140078611
    Abstract: Systems and methods for reducing problems and disadvantages associated with protecting data during cold excursions are provided. A method for preventing unreliable data operations at cold temperatures may include determining whether a first internal temperature of a hard disk drive (HDD) is below a threshold temperature. The method may also include initiating an artificial seek operation if the first internal temperature is below the threshold temperature.
    Type: Application
    Filed: September 20, 2012
    Publication date: March 20, 2014
    Inventor: Clinton Allen Powell
  • Patent number: 8638519
    Abstract: A system including a monitoring module configured to monitor whether, during a first predetermined period, at least one of a read operation, a write operation, or a seek operation is performed on a platter of a storage device in response to the platter of the storage device rotating at a first speed. A speed control module is configured to rotate the platter of the storage device at a second speed in response to none of the read operation, the write operation, or the seek operation being performed on the platter of the storage device during the first predetermined period. The second speed is (i) less than the first speed, and (ii) greater than zero. None of the read operation, the write operation, or the seek operation is performed on the platter of the storage device in response to the platter of the storage device rotating at the second speed.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: January 28, 2014
    Assignee: Marvell International Ltd
    Inventors: Edy Susanto, Foo Leng Leong, Cheng Yong Teoh
  • Patent number: 8633667
    Abstract: A motor speed determining circuit determining a rotation speed of a motor is provided and a processing of generating motor driving waveform is switched in accordance with the rotation speed of the motor. A resolver signal outputted from a resolver 2 is converted to a digital value by an R/D converter 3, and inputted to a computing circuit of resolver value correction 5 via an R/D conversion interface 4. A current value of a motor M is converted to a digital value by an A/D convertor 8. The computing circuit of resolver value correction 5 computes a resolver correction value of the inputted digital signal and calculates positional data from a corrected resolver value. The computing circuit of motor control computes a current instruction value from a motor current value subjected to digital conversion by the A/D converter 8 and a motor current instruction value etc.
    Type: Grant
    Filed: February 10, 2010
    Date of Patent: January 21, 2014
    Assignee: Renesas Electronics Corporation
    Inventor: Hisaaki Watanabe
  • Patent number: 8630054
    Abstract: Some embodiments of the invention are directed to a data storage system that includes a disk and solid-state non-volatile memory (NVM). During a power failure, the data storage system may use back EMF (BEMF) voltage from the spindle motor of the disk to park the heads of the disk and/or store data in the NVM. In one embodiment, a demand regulation circuit regulates loads that use voltage generated from the BEMF. The demand regulation circuit may be used to selectively cause a controller to adjust the rate of programming to the NVM in order to reduce the load. For example, the demand regulation circuit may assert a throttle signal to the controller upon detecting that the voltage generated from the BEMF is below a certain threshold. Programming rate may be throttled, programming cycles may be staggered, and/or programming time may be lengthened. Throttling may enable the use of smaller circuitry.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: January 14, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: George J. Bennett, Steven R. Vasquez, Robert P. Ryan
  • Patent number: 8630058
    Abstract: A magnetic tape apparatus performs at least one of data reading processing and data writing processing on LTO wound around a reel. The magnetic tape apparatus causes the reel to rotate and move the LTO to a position at which the data writing processing or the data reading processing can be performed by a magnetic head. The magnetic tape apparatus is arranged along the width direction of the magnetic tape of LTO, which is driven, to detect medium abnormality that occurred in either a start-end or a stop-end in the width direction of the magnetic tape.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: January 14, 2014
    Assignee: Fujitsu Limited
    Inventor: Jun-ichi Sato
  • Patent number: 8610391
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. During a spin-up operation a sinusoidal driving voltage is applied to each winding of the spindle motor. A back electromotive force (BEMF) voltage generated by at least one of the windings is measured, and a rotation speed of the spindle motor is measured. The sinusoidal driving voltage is adjusted in order to optimize a lead angle relative to the rotation speed, wherein the lead angle represents a degree the sinusoidal driving voltage leads the BEMF voltage.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: December 17, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventors: Wenli Yang, Philip Tin Yue Ng, Ashok K. Desai, Robert P. Ryan
  • Patent number: 8468298
    Abstract: Timing at which a rotation of a physical disk can stop is taken to more appropriately stop the rotation of the physical disk.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: June 18, 2013
    Assignee: Fujitsu Limited
    Inventor: Satoshi Iyoda