Disk Record Patents (Class 360/234)
  • Patent number: 8977816
    Abstract: A cache and disk management method is provided. In the cache and disk management method, a command to delete all valid data stored in a cache, or specific data corresponding to a part of the valid data may be transmitted to a plurality of member disks. That is, all of the valid data or the specific data may exist in the cache only, and may be deleted from the plurality of member disks. Accordingly, the plurality of member disks may secure more space, an internal copy overhead may be reduced, and more particularly, solid state disks may achieve better performance.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: March 10, 2015
    Assignee: OCZ Storage Solutions Inc.
    Inventor: Soo Gil Jeong
  • Patent number: 8891192
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of tracks, and a head actuated over the disk. One of the tracks is read to generate a read signal, and a noise signal is injected into the read signal to generate a noisy read signal. An off-track read capability (OTRC) is measured based on the noisy read signal, and a parameter of the disk drive is adjusted based on the OTRC.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: November 18, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Dean V. Dang, Philip Bernard Saram, Robert S. Cohn, Donald Brunnett, Kamalam P. Elayappan
  • Patent number: 8873190
    Abstract: A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by servo sectors, wherein each servo sector comprises a plurality of servo bursts. The servo bursts in a servo sector are read to generate a read signal, and a position error signal (PES) is generated in response to the read signal, wherein the PES represents a position of the head over the disk. A fly height measurement (FHM) is generated in response to the read signal, and the FHM is adjusted based on an adjustment value generated in response to the PES.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: October 28, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventor: Suthananth E. Christdhas
  • Patent number: 8730612
    Abstract: A disk drive is disclosed comprising a first head actuated over a first disk surface, and a second head actuated over a second disk surface. A first fly height (FH) setting is adjusted for the first head, and a second FH setting is adjusted for the second head. When a ratio of the first FH setting to the second FH setting exceeds a threshold, corrective action is taken.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: May 20, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventor: Phillip S. Haralson
  • Publication number: 20130163119
    Abstract: A hard disk drive comprising a mixed layer is provided to reduce the head-media spacing in the hard disk drive by embedding a surface of a magnetic recording medium or head of the hard disk drive with energetic ions. The mixed layer provides sufficient protection against corrosion and wear of the magnetic layer of the magnetic recording medium without requiring any DLC and/or lubricant overcoat.
    Type: Application
    Filed: September 7, 2011
    Publication date: June 27, 2013
    Applicant: NATIONAL UNIVERSITY OF SINGAPORE
    Inventors: Charanjit Signh Bhatia, Abdul Samad Mohammed
  • Publication number: 20130050876
    Abstract: Disclosed herein are magnetic sensors that include: a sensor stack having a front and an opposing back, wherein the front of the sensor stack defines an air bearing surface of the magnetic sensor, and the sensor stack includes: a free layer assembly having a second magnetization direction, that is substantially perpendicular to a plane of each layer of the sensor stack; and a stabilizing structure positioned away from the air bearing surface at the back of the sensor stack.
    Type: Application
    Filed: August 31, 2011
    Publication date: February 28, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mark William Covington, Dimitar Velikov Dimitrov, Wonjoon Jung, Dion Song
  • Patent number: 8279556
    Abstract: A slider designed to reduce fly height sigma in a plurality of fly media is provided. The slider includes an air bearing surface, a front shallow step pad and a rear shallow step pad that are at a first level deeper than the air bearing surface. The slider further includes a first rear side pocket that is at a second level deeper than the air bearing surface, the first side pocket substantially polygon shaped and a second rear non-symmetrical side pocket non-symmetrical with the first rear side pocket that is at the second level deeper than the air bearing surface, the second side pockets substantially polygon shaped wherein the second rear non-symmetrical side pocket comprises a larger volume than the first rear side pocket.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: October 2, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventor: Oscar Ruiz
  • Publication number: 20110134564
    Abstract: A magnetic head, according to one embodiment, includes a sensor film, a sensor cap film provided above the sensor film, a pair of shields including an upper magnetic shield and a lower magnetic shield which serve as electrodes that pass current in a film thickness direction of the sensor film, a track insulating film contacting both sides of the sensor film in the track width direction, a graded domain control film arranged on both sides in the track width direction of the sensor film adjacent the track insulating film, and an element height direction insulating film positioned on an opposite side of the sensor film relative to an air-bearing surface, wherein an edge position of the element height direction insulating film adjacent the sensor film on the air-bearing surface side is substantially the same as an edge position of the sensor cap film in the element height direction.
    Type: Application
    Filed: November 30, 2010
    Publication date: June 9, 2011
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Nobuo Yoshida, Masato Shiimoto, Kenichi Akita, Kan Yasui
  • Publication number: 20110075298
    Abstract: Proposed is a fluid dynamic bearing system having a bearing bush, a shaft rotatably supported in a bearing bore of the bearing bush and a hub connected to the shaft. A bearing gap filled with bearing fluid and having an axial section is defined between the shaft, the bearing bush and the hub. A first and a second fluid dynamic radial bearing are disposed along the axial section of the bearing gap, the radial bearings being marked by grooved bearing patterns on the associated bearing surfaces of the shaft and/or of the bearing bush. The two radial bearings have a mutual distance dL measured from an apex line of the first radial bearing to an apex line of the second radial bearing. A separator groove is disposed in the bearing bush or in the shaft in the axial section of the bearing gap between the two radial bearings and has an axial length lS. According to the invention, the ratio between the distance dL and the length lS is greater than 5 (five).
    Type: Application
    Filed: September 21, 2010
    Publication date: March 31, 2011
    Inventors: Andreas KULL, Mathias Wildpreth
  • Publication number: 20100271732
    Abstract: In a magnetic head suspension according to the present invention, each of paired right and left connecting beams that are positioned on both sides in a suspension width direction of an open section, with which piezoelectric elements are at least partially overlapped in a plan view, and connect a proximal end section directly or indirectly connected to a main actuator and a distal end section to which a load bending part is connected includes a convex portion projecting in a thickness direction that is perpendicular to the disk surface. The configuration makes it possible to improve the impact resistance and raise the resonance frequency of a magnetic head suspension capable of performing micro motion of a magnetic head slider by the piezoelectric elements.
    Type: Application
    Filed: April 23, 2010
    Publication date: October 28, 2010
    Applicant: SUNCALL CORPORATION
    Inventor: Yasuo FUJIMOTO
  • Patent number: 7742260
    Abstract: A magnetic head assembly includes a magnetic head slider with an element-formed surface on which at least one MR read head element is formed, an ABS to be opposed in operation to a magnetic recording medium and a fixing surface that is the other side of the ABS, and a support for supporting the magnetic head slider. The fixing surface of the magnetic head slider is fixed to the support by at least cure-shrinkage resin material layer providing a contractive force when cured. The cure-shrinkage resin material layer has at least one strip-shaped pattern running along a track width direction.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: June 22, 2010
    Assignee: TDK Corporation
    Inventors: Naoki Ohta, Nozomu Hachisuka
  • Publication number: 20100134924
    Abstract: According to one embodiment, a storage device includes at least one storage disk fixed to a hub mounted on a motor by a disk fixing mechanism, and a head configured to read and write information from and to the storage disk. The disk fixing mechanism includes a clamp ring, including a mounting hole on an inner peripheral side thereof through which the clamp ring is attached to the hub by a screw and a pressing portion for pressing the disk and a balance adjustment recess on an outer peripheral side thereof, and a balance wire attached to the balance adjustment recess. A first portion from the inner peripheral side to the pressing portion of the clamp ring and a second portion with the balance adjustment recess are formed of different materials.
    Type: Application
    Filed: February 4, 2010
    Publication date: June 3, 2010
    Applicant: TOSHIBA STORAGE DEVICE CORPORATION
    Inventor: Hiroshi NAGATA
  • Patent number: 7663837
    Abstract: A rotor blade and an HDD (hard disk drive) having the same, wherein the rotor blade is mounted together with a disk-shaped data storing medium on a spindle motor of the HDD to rotate coaxially with the disk-shaped data storing medium. The rotor blade includes a plurality of blades to increase a floating force applied to a slider that records or reads data on or from the disk-shaped data storing medium by increasing a speed of an airflow in an inner region of the disk-shaped data storing medium.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: February 16, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hong-taek Lim, Byoung-gyou Choi, Sung-wook Kim
  • Patent number: 7660071
    Abstract: A disk drive includes a rotatable data storage disk and a vane positioned adjacent to the disk that receives airflow generated during rotation of the disk. A sensor is operably coupled to the vane and measures airflow force on the vane. Because of a known relationship between altitude and airflow force, the amount of airflow force on the vane is indicative of altitude of the disk drive. The sensor provides an output signal that is indicative of measured airflow force on the vane. The vane surface may be oriented substantially orthogonal to a plane of the disk or substantially parallel with a plane of the disk.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: February 9, 2010
    Assignee: Seagate Technology, LLC
    Inventors: Timothy A. Riener, Francis P. Crimi
  • Publication number: 20090244777
    Abstract: A disclosed method for manufacturing a magnetic recording medium includes a first step of forming a magnetic recording film on a non-magnetic substrate and a second step of forming, in the magnetic recording film, a magnetic recording region which is magnetically recordable and an isolation region which is magnetically non-recordable and includes a first isolation-region portion and a second isolation-region portion. The second step includes the sub-steps of performing first ion implantation on the magnetic recording film to form the first isolation-region portion along a boundary of the isolation region to be formed with the magnetic recording region to be formed; and performing second ion implantation on the magnetic recording film to form the second isolation-region portion in the surface of the isolation region to be formed.
    Type: Application
    Filed: October 22, 2008
    Publication date: October 1, 2009
    Applicant: FUJITSU LIMITED
    Inventors: Sanae Shimizu, Yuji Ito
  • Publication number: 20090244778
    Abstract: A head suspension assembly comprising: a head suspension; a head slider having the medium-opposed surface opposed to a storage medium, the head slider having the supported surface received on the head suspension, the supported surface being defined at the farside of the medium-opposed surface; an electromagnetic transducer embedded in the medium-opposed surface of the head slider; a light waveguide incorporated in the head slider, the light waveguide extending from the supported surface to the medium-opposed surface; and an optical element interposed between the supported surface and the head suspension, wherein the optical element defines: a light-collecting surface configured to collect light input into the optical element in parallel with the supported surface; and a light-reflective surface configured to reflect the light at a predetermined angle so as to direct the light to the light waveguide.
    Type: Application
    Filed: June 16, 2009
    Publication date: October 1, 2009
    Applicant: FUJITSU LIMITED
    Inventors: Shin-ya Hasegawa, Wataru Odajima, Fumihiro Tawa, Yoshifumi Mizoshita
  • Publication number: 20090141400
    Abstract: Embodiments of the present invention provide a magnetic disk drive capable of suppressing variations in flying height of a magnetic head caused by decrease in the amount of a low density gas inside a housing and a control method therefore. According to one embodiment, the magnetic disk drive includes a magnetic head, a magnetic disk, and a housing containing the magnetic head and the magnetic disk, wherein the housing is filled with a low density gas having a lower density than air. An amount of the low density gas in the housing is estimated and, based on the amount of the low density gas, a flying height of the magnetic head from a surface of the magnetic disk is controlled.
    Type: Application
    Filed: November 4, 2008
    Publication date: June 4, 2009
    Inventor: Hiroyasu Tanabe
  • Patent number: 7480119
    Abstract: A magnetic head slider disposed opposite to a surface of a magnetic disk, includes a slider main body, a magnetic head element that reads and reproduces data from the magnetic disk, and a vibration absorbing unit that absorbs vibrations generated due to contact between any portion of the slider main body and the surface of the magnetic disk, and that is provided on the slider main body at a predetermined position.
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: January 20, 2009
    Assignee: Fujitsu Limited
    Inventors: Takahiro Imamura, Kenrou Yamamoto
  • Publication number: 20080266714
    Abstract: A suspension for supporting a head slider has a flexure, several trace patterns positioned on the flexure, front flexure-bonding pads disposed on the flexure at a position corresponding to a leading edge of the head slider and connected to the trace patterns, and rear flexure-bonding pads disposed on the flexure at a position corresponding to a trailing edge of the head slider and connected to the trace patterns. The front and the rear flexure-bonding pads and the trace patterns are integrally formed and disposed on the flexure at the same time, so the fabricating process is simplified and there is no alignment problem for bonding location. This can ensure the connection strength and position between the head slider and the suspension changeless and, in turns, ensure a good attitude of the head slider. The invention also discloses a HGA and a disk drive device with such suspension, and a fabricating method for the suspension.
    Type: Application
    Filed: April 30, 2007
    Publication date: October 30, 2008
    Applicant: SAE Magnetics (H.K) Ltd.
    Inventors: XianWen Feng, YiuSing Ho
  • Publication number: 20080192382
    Abstract: A holder with includes: a holder body formed by molding a resin material, a contact surface on the holder body for receiving an operating object to be held on the holder body, a grip portion on the holder body at a position apart from the contact surface for being gripped by an operator, and an electric conductor extending from the contact surface to the grip portion.
    Type: Application
    Filed: January 24, 2008
    Publication date: August 14, 2008
    Applicant: FUJITSU LIMITED
    Inventor: Tomohide Nakajima
  • Publication number: 20080174915
    Abstract: A device comprises a fluid bearing including a textured fluid bearing surface and a second surface and a recordable disc. The recordable disc includes a substrate, a recordable media layer on the substrate, and at least one of the textured fluid bearing surface and the second surface. The device may be manufactured using MEMS techniques. MEMS techniques provide the high precision necessary to create the textured fluid bearing surface. MEMS techniques also allow the recordable disc to be batch-fabricated with one or more additional recordable discs.
    Type: Application
    Filed: January 23, 2007
    Publication date: July 24, 2008
    Inventors: Roger L. Hipwell, Nurul Amin, John R. Pendray, Andrew D. White, Bradley J. Ver Meer, Hans L. Leuthold, Menachem Rafaelof, Wayne A. Bonin
  • Patent number: 6873492
    Abstract: Magnetic patterned media comprise topographical features readable with a slider-mounted non-magnetic transducer sensitive primarily to a local aerodynamic boundary condition, in addition to a magnetic recording layer substantially conforming to the topographical features. Passage of a transducer over the features generates effects that can be detected in, and separated from, the magnetic recording signal.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: March 29, 2005
    Assignee: Imation Corp.
    Inventor: Garry R. Lundstrom
  • Patent number: 6856489
    Abstract: Windage proximate to a spinning disk within a disk drive is directed through a plurality of apertures in a ramp situated near the outside diameter of the disk. A tab extending from a load beam that supports a slider rests on the ramp when the drive is not in use. When the drive is started the disk begins to spin and an actuator moves the load beam to bring the slider over the surface of the disk. As the load beam moves, the tab is guided along the ramp and cushioned by the air flow emerging from apertures in the ramp beneath it. When the drive is stopped the actuator brings the load beam back so that the tab engages the ramp. A cushion of air is again provided as the tab is moved along the ramp as the tab is returned to a parked position.
    Type: Grant
    Filed: January 27, 2004
    Date of Patent: February 15, 2005
    Assignee: Western Digital (Fremont), Inc.
    Inventors: Muhammad A. Hawwa, Jamshid Bozorgi, Aric Menon
  • Publication number: 20040264049
    Abstract: A magnetic bearing assembly, which includes magnetic bearing elements on a head suspension assembly and disc. The magnetic bearing elements of the magnetic bearing assembly are operable to provide a repulsion force between the head and the disc to provide a fly-height for read or write operations. Embodiments include active fly height measurement to control fly height parameters of the head.
    Type: Application
    Filed: June 26, 2003
    Publication date: December 30, 2004
    Inventors: Richard C. Brown, Scott D. Ulrich, Mark R. Conner
  • Patent number: 6665146
    Abstract: Windage proximate to a spinning disk within a disk drive is directed through a plurality of apertures in a ramp situated near the outside diameter of the disk. A tab extending from a load beam that supports a slider rests on the ramp when the drive is not in use. When the drive is started the disk begins to spin and an actuator moves the load beam to bring the slider over the surface of the disk. As the load beam moves, the tab is guided along the ramp and cushioned by the air flow emerging from apertures in the ramp beneath it. When the drive is stopped the actuator brings the load beam back so that the tab engages the ramp. A cushion of air is again provided as the tab is moved along the ramp as the tab is returned to a parked position.
    Type: Grant
    Filed: June 24, 2002
    Date of Patent: December 16, 2003
    Assignee: Western Digital (Fremont)
    Inventors: Muhammad A. Hawwa, Jamshid Bozorgi, Aric Menon
  • Patent number: 6654190
    Abstract: A system for modeling air bearing designs for heads of a data storage system The modeling system includes user definable surface contours for mask surfaces. The system generates integrated surface functions for the mask surfaces based upon the user defined mask surface contours. The system includes a user definable depth dimension for the mask surface functions and the integrated mask surface functions and dimension parameter for the mask surfaces are compiled to simulate a modeled air bearing structure for performance analysis and evaluation. The integrated mask surface functions are used to define the multiple mask tiers for slider fabrication.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: November 25, 2003
    Assignee: Seagate Technology LLC
    Inventors: Bijoyendra Nath, Yu-Li Chang
  • Publication number: 20020075597
    Abstract: The present invention relates to a method and apparatus for folding a thin part such as the tail of a Flexible Circuit On Suspension or Traces Suspension Assembly that are used in a disc drive. The method comprises securing a portion of the thin part and then directing a fluid at the thin part to bend an unsecured portion of the thin part relative to the secured portion of the thin part. The apparatus comprises a fixture for securing the thin part and a fluid emitter positioned near the fixture to direct a fluid at the thin part such that the fluid bends the thin part relative to the fixture. The method and apparatus of the present invention are much more efficient than manually folding thin parts and eliminate any harmful contact between the thin parts and moving tools during the folding operation.
    Type: Application
    Filed: October 26, 2001
    Publication date: June 20, 2002
    Applicant: Seagate Technology LLC
    Inventor: Niandong Liu
  • Patent number: 6168715
    Abstract: The invention concerns a device for the oil treatment of sintered parts consisting of a drum (11, 111) which is mounted so that it can rotate about a vertical axis and which can be driven. It has a drum mantle (11′, 111′) and loading and unloading devices so that it can be loaded and unloaded axially, a floor that tightly closes the opening in the floor (19, 119) against the-drum mantle (11′, 111′), connections (28, 29, 30, 31/128, 129, 130, 131) leading into the drum (11, 111) for liquid and gaseous treatment media for carrying out the treatment phases, and outlets (35, 135) for letting treatment fluids out of the drum (11, 111). The task of the invention is to create a device that not only mechanizes the treatment process but also can be repeated many times, always in the same way.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: January 2, 2001
    Assignee: Turbo-Clean GmbH
    Inventor: Heinz Schulze-Eyssing