Speed Patents (Class 360/73.01)
  • Patent number: 9697063
    Abstract: A data storage service receives a request to store data into a data storage system that consists of many physical data storage locations, each location having various physical characteristics. The data storage service determines a proper location for the data based on data placement rules applied to the physical data storage locations such that a set of proper locations is identified. The data storage service can place the data according to data placement rules.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: July 4, 2017
    Assignee: Amazon Technologies, Inc.
    Inventor: Colin Laird Lazier
  • Patent number: 9509237
    Abstract: Methods for starting an AC motor with a variable speed drive and switching the motor to a higher voltage power source are described. Provided are AC motors with a stator having a plurality of coils, the plurality comprising a complete set of coils for each phase, the complete set comprising a first set of coils comprising first groups of coils connected in series, or parallel, or a combination, and a second set of coils comprising second groups of coils connected in series, or parallel, or a combination, wherein the output of a variable speed drive is connected to a tap on the complete set of coils such that the AC motor may be started with a variable speed drive, and an output of the power line is connected to the series of the first and second sets of coils.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: November 29, 2016
    Assignee: TMEIC Corporation
    Inventor: Marcelo Andres Lara
  • Patent number: 9509243
    Abstract: A self-calibrating linear actuator is configured to control a spring return valve with variable stroke. The actuator includes a motor, a spindle coupled to an output of the motor, a motor controller coupled to the motor, a microcontroller coupled to the motor controller, and a back electromotive force (BEMF) circuit, coupled to the motor, configured to provide to the microcontroller a BEMF value for each motor step. The microcontroller is configured to determine a difference of a number of motor steps during operation of the actuator and to store the difference as a calibrated touch point for the actuator.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: November 29, 2016
    Assignee: Johnson Controls Technology Company
    Inventors: Claudio Viscardi, Achim Reinders
  • Patent number: 9037412
    Abstract: A device for checking the running performance of a motor vehicle, which can have at least the following components: a system for measuring a distance of a motor vehicle which is integrated in a motor vehicle, a vehicle communication system for wireless data transmission, where the system is identifiable by a unique identification number of the motor vehicle, and data may be transmitted from the vehicle to a receiver, a stationary database system for storing and providing data, which is equipped with a receiver that allows communication with the in-vehicle communication system, and an interface which allows stationary and mobile communication terminal system.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: May 19, 2015
    Inventor: Thomas Dominik Schwanhäuser
  • 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: 8994307
    Abstract: Dynamic reconfiguration-switching of motor windings in a motor is optimized between winding-configurations by selectively lowering resistance of a constantly used portion of one of the motor windings. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: March 31, 2015
    Assignee: International Business Machines Corporation
    Inventors: Allen K. Bates, Nhan X. Bui, Reed A. Hancock, Daniel J. Winarski
  • Patent number: 8981696
    Abstract: Dynamic reconfiguration-switching of motor windings in an electric motor in an electric vehicle is optimized between winding-configurations. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: March 17, 2015
    Assignee: International Business Machines Corporation
    Inventors: Allen Keith Bates, Nhan Xuan Bui, Reed Alan Hancock, Daniel James Winarski
  • Patent number: 8909889
    Abstract: A disk drive including a disk configured to spin at a target spin speed, a servo core configured to access the disk, a first non-volatile memory configured to store a first initialization firmware, a second non-volatile memory configured to store a second initialization firmware, a first volatile memory, a second volatile memory, a non-volatile memory core configured to access the first non-volatile memory, and a main core. The main core is configured to load the second initialization firmware from the second non-volatile memory to the second volatile memory concurrently with the loading of the first initialization firmware from the first non-volatile memory to the first volatile memory by the non-volatile memory core, control the servo core to initiate spinning of the disk, and communicate with the non-volatile memory core to service host commands from the first non-volatile memory when the disk is not spinning at the target spin speed.
    Type: Grant
    Filed: October 10, 2011
    Date of Patent: December 9, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Choo-Bhin Ong, Chandra M. Guda
  • Patent number: 8649121
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, a spindle motor operable to rotate the disk, and control circuitry comprising a speed control loop operable to control a rotation speed of the disk. A rotation speed of the disk is measured, and a speed error is generated in response to the measured rotation speed. The speed error is processed with a compensator to generate a control signal, a disturbance is injected into the control signal to generate a modified control signal, and the modified control signal is applied to the spindle motor. An amplitude of the disturbance is ramped, and after ramping the amplitude of the disturbance, an open-loop gain of the speed control loop is estimated at a frequency of the disturbance, and at least one parameter of the compensator is adjusted in response to the estimated open-loop gain.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: February 11, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Brandon P. Smith, Wenli Yang
  • Publication number: 20130176642
    Abstract: Dynamic reconfiguration-switching of motor windings in a disk drive is optimized between winding-configurations by selectively lowering resistance of a constantly used portion of one of the motor windings. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.
    Type: Application
    Filed: March 1, 2013
    Publication date: July 11, 2013
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventor: INTERNATIONAL BUSINESS MACHINES CORPORATION
  • Publication number: 20130141815
    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: Application
    Filed: December 6, 2011
    Publication date: June 6, 2013
    Inventors: Takao Suzuki, Kohji Takahashi, Tomoki Hiramatsu, Toshihisa Kiyonaga
  • Patent number: 8437098
    Abstract: Provided are a computer program product, system, and method for a magnetic disk drive. The disk drive has at least one disk platter having at least one recordable disk surface having an areal density of at least 200 gigabits per square inch. Either a diameter of the at least one disk platter is greater than 3.5 inches or the at least one disk platter rotates at less than 5400 RPMs. A read/write head reads and writes tracks of data with respect to the at least one disk surface. Modified tracks from write requests to write to the at least one disk surface on the at least one disk platter are cached in a non-volatile storage device for caching modified tracks. Modified tracks are cached in the non-volatile storage device to later destage to the at least one disk surface.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: May 7, 2013
    Assignee: International Business Machines Corporation
    Inventors: Michael T. Benhase, Lokesh M. Gupta
  • Patent number: 8432632
    Abstract: Provided are a computer program product, system, and method for a magnetic disk drive. The disk drive has at least one disk platter having at least one recordable disk surface having an areal density of at least 200 gigabits per square inch. Either a diameter of the at least one disk platter is greater than 3.5 inches or the at least one disk platter rotates at less than 5400 RPMs. A read/write head reads and writes tracks of data with respect to the at least one disk surface. Modified tracks from write requests to write to the at least one disk surface on the at least one disk platter are cached in a non-volatile storage device for caching modified tracks. Modified tracks are cached in the non-volatile storage device to later destage to the at least one disk surface.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: April 30, 2013
    Assignee: International Business Machines Corporation
    Inventors: Michael T. Benhase, Lokesh M. Gupta
  • Patent number: 8401817
    Abstract: A velocity detection device includes a rotational direction discriminator calculating an x coordinate or a y coordinate in temporary coordinates on a line between an origin of the coordinates and a point obtained by rotating the actual second coordinates by as much as a rotational angle ? in a direction of a coordinate axis, the rotational direction discriminator discriminating a rotational direction from the actual first coordinates to the actual second coordinates based on either a sign of the x or y coordinate in the temporary coordinates; and a processor calculating calculational second coordinates represented by a multiplication, addition or subtraction between the actual first coordinates and one of the trigonometric function values to make calculational second coordinates closer to the actual second coordinates, and calculating the velocity of the moving body based on the temporary angles corresponding to the trigonometric function value used for the calculational second coordinates.
    Type: Grant
    Filed: May 11, 2009
    Date of Patent: March 19, 2013
    Assignee: Toshiba Kikai Kabushi Kaisha
    Inventor: Shouichi Sato
  • Publication number: 20130027805
    Abstract: According to one embodiment, an information processing apparatus includes: a main unit; a first disk device provided in the main unit; a second disk device provided in the main unit; an acceleration sensor provided in the main unit and detecting an acceleration; a setting module for setting whether to execute a disk protection processing for at least one of the first disk device and the second disk device or not; and a controller for executing the processing on the disk device for which the execution of the processing is set by the setting module, when an acceleration is detected by the acceleration sensor.
    Type: Application
    Filed: June 4, 2012
    Publication date: January 31, 2013
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Toshikazu Mukaiyama
  • Publication number: 20120140355
    Abstract: A token value is maintained based on an allowable number of low power transitions of a hard disk drive without adversely affecting reliability, compared to an actual number of low power transitions of said hard disk drive. The allowable number of low power transitions increases over the hard disk drive's lifetime. Before the hard disk drive performs a low power transition, the token is evaluated to determine if the hard disk drive is allowed to perform a low power transition. Low power transitions discussed include parking the head and spinning-down the hard disk drive.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 7, 2012
    Applicant: International Business Machine Corporation
    Inventors: John B. Carter, Wesley M. Felter, Anthony N. Hylick
  • Patent number: 8036076
    Abstract: Provided is a computer system including: a computer running as a DB server; a storage system including a plurality of disk drives for storing data; and a management module, in which: at least one of the plurality of disk drives stores data of a DB schema written by the computer; the management module specifies the DB schema to be accessed based on a received query, transmits, to the storage system, an instruction to copy at least a portion of the data of the specified DB schema from the disk drive to a memory, and transmits, to the storage system, an instruction to control an rpm of the disk drive that stores the data of the specified DB schema; and the storage system controls the rpm of the disk drive based on the instruction. Accordingly, power consumption of the storage system can be reduced even if installed disks increase in number.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: October 11, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Hideomi Idei, Kazuhiko Mogi, Norifumi Nishikawa
  • Patent number: 8022646
    Abstract: Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In some implementations, first and second signals indicative of BEMF of different stator windings may be used to determine a speed-related characteristic. The speed related characteristic may be used to determine an error amount, which may be used to determine a correction factor to control the speed of the spindle motor.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: September 20, 2011
    Assignee: Marvell International Ltd.
    Inventors: Pantas Sutardja, Jerry Richgels
  • Patent number: 8009378
    Abstract: According to one embodiment, a power management module of a storage device executes a process of stopping rotation of a disk storage medium by selectively using one of a first mode of stopping the rotation of the disk storage medium on condition that a media access command is not received during a predetermined time from last reception of a media access command, and a second mode of stopping the rotation of the disk storage medium on condition that a media access command which causes access to the disk storage medium is not received during a predetermined time from last reception of a media access command which causes access to the disk storage medium. In addition, the power management module executes a process of starting the rotation of the disk storage medium by selectively using one of a third mode and a fourth mode.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: August 30, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takehiko Kurashige, Shinji Saito
  • Patent number: 7995303
    Abstract: Various embodiments for writing received synchronized data to magnetic tape having a plurality of wraps using a magnetic tape drive adapted for performing the writing according to an available plurality of predefined tape speeds are provided. In one such embodiment, for each of the available plurality of predefined tape speeds, an average overhead per synchronized command for performing a recursively accumulated backhitchless flush (RABF) cycle is calculated. One of the available plurality of predefined tape speeds having a lowest calculated average overhead is selected. The RABF cycle is performed using the selected one of the available plurality of predefined tape speeds.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: August 9, 2011
    Assignee: International Business Machines Corporation
    Inventors: James M. Karp, Takashi Katagiri, Motoko Oe, Yutaka Oishi
  • Publication number: 20110181981
    Abstract: Embodiments of methods and systems for controlling access to information stored on memory or data storage devices are disclosed. In various embodiments, fluid-mediated modification of information or access to information is utilized. According to various embodiments, data storage devices designed for rotating access are described which include rotation-activated fluid control mechanisms.
    Type: Application
    Filed: January 13, 2011
    Publication date: July 28, 2011
    Inventors: Bran Ferren, Edward K.Y. Jung, Clarence T. Tegreene
  • Patent number: 7916418
    Abstract: Method and apparatus for controlling the rotation velocity of an optical disc in a wide range of velocities, including low velocities. In a first range of velocities, a first sensor, for example an EMF sensor, is used to control the commutation moments of a turntable motor. For velocities outside the first range, a periodic control signal based on a periodic second signal generated by a second sensor and a mapping between the first and second periodic signal are used. The method and the apparatus are suitable for LightScribe™ applications.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: March 29, 2011
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Joop Van Bijnen, Gian Hoogzaad
  • Publication number: 20110051280
    Abstract: Various embodiments for writing received synchronized data to magnetic tape having a plurality of wraps using a magnetic tape drive adapted for performing the writing according to an available plurality of predefined tape speeds are provided. In one such embodiment, for each of the available plurality of predefined tape speeds, an average overhead per synchronized command for performing a recursively accumulated backhitchless flush (RABF) cycle is calculated. One of the available plurality of predefined tape speeds having a lowest calculated average overhead is selected. The RABF cycle is performed using the selected one of the available plurality of predefined tape speeds.
    Type: Application
    Filed: August 31, 2009
    Publication date: March 3, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: James M. KARP, Takashi KATAGIRI, Motoko OE, Yutaka OISHI
  • Patent number: 7710681
    Abstract: Provided are techniques for determining a tape speed for a next sync operation. A sync command is received. An average transaction size and an average host transfer rate of a set of previous sync operations are calculated. The tape speed for the next sync operation is determined using the average transaction size, the average host transfer rate, and a backhitch time. Data is written to a tape cartridge using the determined tape speed.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: May 4, 2010
    Assignee: International Business Machines Corporation
    Inventors: Hiroshi Itagaki, James Mitchell Karp, Takashi Katagiri
  • Publication number: 20100079897
    Abstract: A system and method for overcoming adhesion between media and a surface of a storage device in contact with the media. A storage device comprises a media velocity detector and a media drive motor controller. The media velocity detector detects storage media velocity as torque is applied to a storage media. The media drive motor controller causes a media drive motor to apply acceleration torque to the storage media. If the media velocity detector detects no increase in media velocity as acceleration torque is applied to the storage media, then the media drive motor controller causes the media drive motor to apply a torque pulse to the storage media.
    Type: Application
    Filed: September 30, 2008
    Publication date: April 1, 2010
    Inventors: Donald J. Fasen, Vernon L. Knowles
  • Publication number: 20090303632
    Abstract: Some embodiments of the present invention provide a system for scheduling spin-up operations for a set of hard disk drives (HDDs) in a computer system. During operation, the system determines an available power of the computer system. Next, one or more HDDs are selected from the set of HDDs to be spun-up based on the available power and the power required to spin up each HDD. Then, spin-up operations are scheduled for the selected HDDs.
    Type: Application
    Filed: June 9, 2008
    Publication date: December 10, 2009
    Applicant: SUN MICROSYSTEMS, INC.
    Inventors: Anton A. Bougaev, Aleksey M. Urmanov, Kenny C. Gross
  • Patent number: 7619845
    Abstract: A method and an apparatus to control a disc drive, and more particularly, a method and an apparatus to control a disc drive using an indirectly determined counter-electromotive force. The method of controlling the disc drive using a counter-electromotive force includes determining a change in a servo parameter of the disc drive; and controlling the disc drive based on the determined change.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: November 17, 2009
    Assignee: Samsung Electronics, Ltd.
    Inventor: Sang-chul Shin
  • Patent number: 7602569
    Abstract: A magnetic tape which is run at a speed of 4 m/sec. or higher and has recording tracks with a width of 21 ?m or less, and which includes a non-magnetic support, at least one magnetic layer formed on one surface of the non-magnetic support, and a backcoat layer formed on the other surface of the non-magnetic support, wherein servo signals for controlling tracking are recorded on the magnetic layer or the backcoat layer, the value of (?/W)×(V/f) is 10 [s?1] or less, and/or the value of (?/W) is 0.1 or less, wherein V [mm/sec.] is a tape-running speed is; ? [?m] is an amount of a weave with a cycle of f [mm] on one edge of the tape or the other edge thereof as the reference side for the running of the tape; and W [?m] is a width of the recording track. The magnetic tape can decrease PES and off-track and thus is excellent in servo tracking performance.
    Type: Grant
    Filed: June 12, 2006
    Date of Patent: October 13, 2009
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Akihiro Nakamura, Masakazu Tani, Kousuke Amano, Shinji Arakawa, Jyunichi Shimizu
  • Patent number: 7602570
    Abstract: A motor power controller for a disk drive includes at least two operation states. In a first operation state, the disk drive motor is running continuously, and in a second operation state, the motor is spun up at the beginning of each data operation and spun down at the end of each data operation. The motor power controller transitions the disk drive from the first to the second operation state when a time interval is longer than a predetermined period of time without any data requests is determined. Further, the motor power controller transitions the disk drive from the second to the first operation state when a predetermined number of time intervals between consecutive data requests are all smaller than the predetermined period of time.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: October 13, 2009
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Bart Michiel De Boer
  • Publication number: 20090231751
    Abstract: According to one embodiment, a disk drive is disclosed to which a plurality of disk rotational speed modes can be set. The disk drive is configured such that input of servo data from servo sectors is thinned out by thinning out an output of an interrupt request to a CPU in a high-speed rotation mode. At the time, a disk controller obtains servo data reproduced from all the servo sectors at timing of servo gates and stores it to a register.
    Type: Application
    Filed: February 23, 2009
    Publication date: September 17, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Asakura, Yuji Sakai, Shuuichi Kojima
  • Publication number: 20090112798
    Abstract: A disk rotation control part for controlling the rotations of a plurality of disk devices is provided. The configuration is such that a disk of a disk device for which an access will not be generated is rotated at a second rate of speed, which is faster than 0, and slower than a first rate of speed, which is the rotation speed at access time. DB management information comprises information denoting which DB schema inside a DB is stored in which location. The disk rotation control part, based on a query plan of a query received by the DBMS, and DB management information, specifies the storage location of a DB schema to be accessed when this query is processed, and rotates a disk of the disk device comprising the specified storage location at a first rate of speed.
    Type: Application
    Filed: December 3, 2008
    Publication date: April 30, 2009
    Inventors: Hideomi IDEI, Norifumi NISHIKAWA, Kazuhiko MOGI
  • Publication number: 20090097150
    Abstract: Methods and apparatus of the present invention allow for interpolated Just in Time (iJIT) seek command control of hard drive actuators.
    Type: Application
    Filed: October 10, 2007
    Publication date: April 16, 2009
    Inventors: NYLES HEISE, Hung M Vu
  • Patent number: 7496696
    Abstract: A method for evaluating data transfer performance within a data recording apparatus is disclosed. The data recording apparatus includes a buffer and a recording medium. Initially, a Pause time P when data transfer between the buffer and a host being stopped temporarily is measured. Then, an ideal Pause time Y is determined. Next, a determination is made whether or not the Pause time P exceeds a sum of the ideal Pause time Y and an allowance a. If the Pause time P exceeds a sum of the ideal Pause time Y and the allowance a, a warning signal is sent to the host.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: February 24, 2009
    Assignee: International Business Machines Corporation
    Inventors: Takashi Katagiri, Hironobu Nagura, Hirokazu Nakayama, Kazuhiro Ozeki
  • Patent number: 7468590
    Abstract: A motor controller comprises an angular position module that determines an angular position of a disk. A spin-up module performs a spin-up of the disk. A ramp-up module ramps up a speed of the disk after the spin-up. A speed control module controls the speed of the disk based on a control program that is downloaded to the motor controller during a boot-up operation of a disk drive. The angular position module determines the angular position of the disk before handover of control to the control program.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: December 23, 2008
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong
  • Publication number: 20080304174
    Abstract: Provided are techniques for determining a tape speed for a next sync operation. A sync command is received. An average transaction size and an average host transfer rate of a set of previous sync operations are calculated. The tape speed for the next sync operation is determined using the average transaction size, the average host transfer rate, and a backhitch time. Data is written to a tape cartridge using the determined tape speed.
    Type: Application
    Filed: June 6, 2007
    Publication date: December 11, 2008
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hiroshi Itagaki, James Mitchell Karp, Takashi Katagiri
  • Patent number: 7440218
    Abstract: A loading/unloading type magnetic disk unit includes a magnetic disk that is rotated or driven by a motor, and a head slider bearing a magnetic head and being movable above the magnetic disk owing to a driving mechanism. Herein, at least one projection made of a highly conductive material is formed on the surface of the head slider opposed to the magnetic disk. When the magnetic disk unit is in operation, conduction to the spindle motor is discontinued after the elapse of a predetermined time. Thus, the height by which the head slider floats is decreased so that the projections come into contact with the magnetic disk. Consequently, a charge on the magnetic disk escapes through the housing of the magnetic disk unit via the head slider. Thus, when the loading/unloading type magnetic disk unit is in operation, a charge on the magnetic disk can be removed.
    Type: Grant
    Filed: August 22, 2006
    Date of Patent: October 21, 2008
    Assignee: Fujitsu Limited
    Inventor: Tohru Iwamoto
  • Patent number: 7428117
    Abstract: A servo signal inspection device and a method for detecting servo signal are provided which can measure and evaluate quality of the servo signal on a magnetic tape with a sufficient resolution. The device includes a servo signal inspecting head, a peak detecting means, a time interval measuring means and an inspection means, wherein a period T [s] of a standard clock signal used in the time interval measuring means and a running speed v [m/s] of the magnetic tape at the servo signal inspecting head satisfy the following relationship: T×v<80 nm.
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: September 23, 2008
    Assignee: FUJIFILM Corporation
    Inventor: Toru Nakao
  • Patent number: 7403459
    Abstract: A method is disclosed for adjusting the rotational speed of a disk player based on a calculated variable. The method increases the rotational speed of the disk player when the calculated variable is greater than a first threshold and decreases the rotational speed of the disk player when the calculated variable is less than a second threshold.
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: July 22, 2008
    Assignee: Lite-On It Corp.
    Inventor: Kun-Chang Chang
  • Patent number: 7394736
    Abstract: A method is disclosed for adjusting the rotational speed of a disk drive. According to the method, the proportion of time which the disc drive is reading data from the disc during a unit time T is calculated. Then, the increase of the rotational speed of the motor is avoided if the error rate Ek that a disc drive reads data during each of r consecutive units of time periods T is not less than a criterion Q. Otherwise, the rotational speed of the motor of the disc drive is increased if the proportion of time Pk that the disc drive spends reading data from the disc is greater than a threshold H during each of m consecutive units of time period T, and the rotational speed of the motor of the disc drive is decreased if the Pk is less than a threshold L during each of n consecutive units of time periods T.
    Type: Grant
    Filed: January 12, 2006
    Date of Patent: July 1, 2008
    Assignee: Lite-On It Corporation
    Inventor: Kun-Chang Chang
  • Patent number: 7375923
    Abstract: A data storage array is provided such as for a distributed storage system or a consumer electronics device wherein increased data storage capacity is provided at the cost of increased power consumption in relation to industry standard power consumption rates. The array has a plurality of data storage devices, each having an actuator operably disposed in a data storing and retrieving relationship with a data storage medium. The data storage medium is rotated at a speed of substantially greater than 10,000 revolutions per minute, and each of the data storage mediums has a data storage capacity of substantially greater than 100 gigabytes. The increased heat created by the relatively faster rotation speed is handled through improved airflow made possible by a multiple device array constructed in accordance with embodiments of the present invention.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: May 20, 2008
    Assignee: Seagate Technology LLC
    Inventors: David Peter DeCenzo, Fred Wayne Flournoy, Erik Riedel
  • Publication number: 20080055768
    Abstract: A velocity calculator performs high-order calculations of servo frame velocities of a storage media, particularly tape and disk. The velocity calculator employs a servo frame indexing module for generating a first-order preceding servo frame velocity signal indicative of a first-order calculation of a preceding servo frame velocity including a first-order preceding servo frame error term based on first-order current servo frame velocity signal indicative of a first-order calculation of a current servo frame velocity including a first-order current servo frame error term. The velocity calculator further employs a velocity estimating module for generating a higher-order current servo frame velocity signal indicative of a second or higher order velocity calculation of the current servo frame velocity including a higher-order current servo frame error term based on the first-order preceding servo frame velocity signal and the first-order current servo frame velocity signal.
    Type: Application
    Filed: September 5, 2006
    Publication date: March 6, 2008
    Applicant: International Business Machines Corporation
    Inventors: Allen K. Bates, Nils Haustein, Craig A. Klein, Daniel J. Winarski
  • Patent number: 7218469
    Abstract: A reel driving apparatus and a magnetic recording and reproducing device including the reel driving apparatus, where the reel driving apparatus includes: a driver including at least a portion protruding under a deck chassis; a power transmitting unit transmitting a power to the driver; a power changing unit gearing with the driver and selectively transmitting a power to a plurality of reel tables according to a direction along which the driver rotates; and a fixing unit supporting the driver.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: May 15, 2007
    Assignee: Samsung Electronics, Co., Ltd.
    Inventors: Jae-kab Seo, Jun-young Kim, Bong-joo Kim, Young-ho Cho, Chung-hum Baik, Myoung-joon Kim
  • Patent number: 7130139
    Abstract: A drive and method of identifying write velocity during reading are provided. When a track is being read, the data signal is processed prior to determining the data stream to identify the velocity with which the track data were written. The read channel is adjusted based on the identified velocity to compensate for write channel transfer function variation.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: October 31, 2006
    Assignee: Storage Technology Corporation
    Inventors: Keith Gary Boyer, Richard Allen Gill
  • Patent number: 7095201
    Abstract: A method and apparatus for providing a user selectable start-up current in a disk drive are provided. A user may select a relatively high start-up current to provide a relatively fast start-up time in a disk drive. Alternatively, the user may select a relatively low maximum current draw by the hard drive to enable a relatively low power, low cost power supply to be used in connection with the hard drive, for use with applications in which a relatively long start-up time is acceptable. In connection with applications in which a low cost power supply is to be used, the maximum current drawn by the disk drive may be limited to the amount of current required by the disk drive during seek operations.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: August 22, 2006
    Assignee: Maxtor Corporation
    Inventors: Erhard Schreck, Mark Heimbaugh
  • Patent number: 6989953
    Abstract: A spindle motor in a disk drive is driven by a driving circuit that, upon receipt of a signal or command, selectively spins up the spindle motor according to a first spin up profile or according to a second spin up profile that is defined to provide a longer spin up time in comparison with the spin up time defined by the first spin up profile. The second spin up profile spins up the spindle motor in a longer period of time and/or generates less acoustic noise as compared to the first spin up profile.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: January 24, 2006
    Assignee: Western Digital Technologies, Inc.
    Inventor: Raffi Codilian
  • Patent number: 6956709
    Abstract: A tape drive and method of identifying write velocity during reading are provided. When a track is being read, a lead-in code of the data signal is processed prior to determining the data stream. The lead-in code identifies the velocity with which the track data were written. The equalization/detection channel is adjusted based on the identified velocity to compensate for write channel transfer function variation. The lead-in code is coded in a way that is reasonably immune to write channel transfer function variation such that the lead-in code is comprehended prior to adjusting the equalization/detection channel.
    Type: Grant
    Filed: June 7, 2004
    Date of Patent: October 18, 2005
    Assignee: Storage Technology Corporation
    Inventors: Keith Gary Boyer, Richard Allen Gill
  • Patent number: 6954324
    Abstract: A disk drive is disclosed employing either back electromotive force (BEMF) spindle speed control mode or wedge spindle speed control mode. A BEMF detector monitors the BEMF voltage generated by the windings of the spindle motor to generate a BEMF speed error. The BEMF spindle speed control mode is used to spin up the disk to an operating speed, and the wedge spindle speed control to maintain the disk at the operating speed. While in the wedge spindle speed control mode, a BEMF detection window is disabled to reduce acoustic noise.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: October 11, 2005
    Assignee: Western Digital Technologies, Inc.
    Inventors: Kuang-Yang Tu, Chuanwen Ji
  • Patent number: 6940675
    Abstract: A hard disk drive energy recovery circuit, a method of recovering energy from a motor of a hard disk drive and a hard disk drive. In one embodiment, the hard disk drive energy recovery circuit includes (1) a spindle resolver that generates transition signals as a spindle motor of the hard disk drive rotates among angular regions, (2) a spindle region state machine, coupled to the spindle resolver, that receives the transition signals and generates rectifier drive signals based thereon and (3) a synchronous rectifier, coupled to the spindle region state machine, that employs the rectifier drive signals to recover electrical energy from the motor.
    Type: Grant
    Filed: November 24, 2003
    Date of Patent: September 6, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: Mehedi Hassan, Gregory Emil Swize
  • Patent number: 6937416
    Abstract: In a video tape recorder (VTR), the capstan draws the tape from which the video signal is reproduced in a forward direction. The following steps are used to control the capstan, applying a torque to the capstan in a backward direction for a first predetermined period of time. Applying a torque to the capstan in the forward direction for a second predetermined period of time and nullifying the motor current. This arrangement is particularly convenient for slow-motion and still-picture modes.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: August 30, 2005
    Assignee: Thomson Licensing S.A.
    Inventor: Kwong Heng Kwok
  • Patent number: 6914740
    Abstract: A disk drive is disclosed employing either back electromotive force (BEMF) spindle speed control or wedge spindle speed control. The BEMF spindle speed control is used to calibrate a reference time period representing an accumulation of a predetermined number of wedge-to-wedge times. During wedge spindle speed control, a wedge time period representing an accumulation of a predetermined number of wedge-to-wedge times is measured, and a wedge speed error is computed as the difference between the reference time period and the wedge time period.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: July 5, 2005
    Assignee: Western Digital Technologies, Inc.
    Inventors: Kuang-Yang Tu, Chuanwen Ji