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Hitachi Global Storage Technologies Netherlands, B.V. Patents
Assignee:
Hitachi Global Storage Technologies Netherlands, B.V.
Address:
Amsterdam, NL
No. of patents:
2409
Patents:


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Patent Number Title Of Patent Date Issued
7719793 Circumferentially patterned disk for longitudinal and perpendicular recording May 18, 2010
A magnetic medium for use in data recording that has a series of concentric magnetic track portions separated from one another by non-magnetic portions or gap portions. The magnetic portions define data tracks and prevent signals from one track from bleeding into another track. Becau
7719791 Reducing a probability of an organic ring forming on an air bearing surface of a slider while ma May 18, 2010
Embodiments of the present invention pertain to reducing a probability of an organic ring forming on an air bearing surface of a slider while manufacturing the head stack assembly. According to one embodiment, clean dry air is received. The clean dry air is blown at a location on a s
7719786 Active fly height control using radio frequency feedback May 18, 2010
In a method of actively controlling slider fly height, a modulated radio frequency (RF) carrier signal is received from a slider. The modulated RF carrier signal comprises an amplitude modulated component which is modulated onto the modulated RF carrier signal by vibration of the sli
7719785 Disk drive device, manufacturing method thereof, and method for setting heater power value for a May 18, 2010
Embodiments of the present invention help to accomplish accurate and reliable clearance control. In one embodiment of the present invention, a disk drive device adjusts the clearance between a head element portion and a disk with a heater on a slider. The clearance control according to
7719783 Hard disk drive with mechanism for controlling protrusion of head May 18, 2010
Embodiments of the invention suppress collision between a head element section and a magnetic disk. In manufacturing a hard disk drive (HDD) according to an embodiment of the present invention, recession R is preliminarily measured for each head slider. Recession R means the amount o
7719069 Three terminal magnetic sensor having a collector region electrically isolated from a carrier su May 18, 2010
In one illustrative example, a three terminal magnetic sensor includes a collector region made of a semiconductor material, a base region, and an emitter region. An insulator layer is formed between the collector region and a carrier substrate body which carries the three terminal magnet
7718282 Magnetic recording medium with corrosion resistance and manufacturing method May 18, 2010
A magnetic recording medium with a granular magnetic recording layer excellent in corrosion resistance is provided. In one embodiment, after formation of, on a non-magnetic substrate, an NiTa adhesion layer, a soft magnetic layer, a Ta intermediate layer, an Ru intermediate layer, and a
7716813 Method for fabricating magnetic write pole for a magnetic head using an E-beam resist mask May 18, 2010
A method is disclosed for independently controlling track width and bevel angle of a write pole tip of a magnetic recording head. The method includes establishing the track width in the pole tip layer material utilizing E-beam lithography. A portion of this pole tip material having t
7716812 Method of manufacturing a magnetic head May 18, 2010
A main magnetic pole of a recording head is formed in an inverted trapezoidal shape by ion milling but, the long milling time poses a problem of variations in the inverted trapezoidal shape and the dimensional variations in track width. In one embodiment of the invention, a recording
7716811 Method for manufacturing a thin film magnetic head May 18, 2010
Head elements are formed on a wafer to suppress deterioration in pinning strength of a pinned layer, which is caused by ESD generated during air bearing surface polishing of a thin film magnetic head. The wafer is cut into rovers in each of which are connected head elements. Rover air
7716509 Storage and access control method for storage May 11, 2010
Embodiments of the invention prevent a storage from being continuously used in a state in which the time of a built-in clock is different from the actual time because of replacement of a battery or intentional tampering of time. In one embodiment, a storage having a recording medium
7716268 Method and apparatus for providing a processor based nested form polynomial engine May 11, 2010
A method and apparatus for providing a processor based nested form polynomial engine are disclosed. A concise instruction format is provided to significantly decrease memory required and allow for instruction pipelining without branch penalty using a nested form polynomial engine. Th
7715152 Magnetic recording head for perpendicular recording, fabrication process, and magnetic disk stor May 11, 2010
Embodiments of the invention provide a perpendicular magnetic writing head with a suppressed effective track width to be written on a magnetic medium while increasing writing magnetic field gradient. In one embodiment a trailing side shield is disposed by way of a gap film to a main
7715147 Magnetic write head having a shield that extends below the leading edge of the write pole May 11, 2010
A magnetic write head for perpendicular magnetic recording that has a write pole and a trailing or side shield that has a leading edge that extends to or beyond the leading edge of write pole, thereby ensuring complete side magnetic shielding. The write head can be formed by forming
7715137 Servo patterns for patterned media May 11, 2010
Servo patterns for patterned media. The servo pattern includes specification of cylinder/track ID with and without a Gray code. The servo pattern space is minimized by the optimum usage of the islands. This is achieved by island allocation rules to take advantage of non-magnetic isla
7713762 Testing the quality of lift-off processes in wafer fabrication May 11, 2010
Test methods and components are disclosed for testing the quality of lift-off processes in wafer fabrication. A wafer is populated with one or more test components along with the functional components. These test components are fabricated with holes in an insulation layer that is dep
7713591 Longitudinal patterned media with circumferential anisotropy for ultra-high density magnetic rec May 11, 2010
An apparatus and method is disclosed for orienting the magnetic anisotropy of longitudinal patterned magnetic recording media. A disk-shaped longitudinal granular magnetic recording medium is provided having a high orientation ratio in the circumferential direction. The medium is then
7713389 Perpendicular magnetic recording disk with ultrathin nucleation film for improved corrosion resi May 11, 2010
A perpendicular magnetic recording disk has a granular cobalt alloy recording layer (RL) containing an additive oxide or oxides, an intermediate layer (IL) as an exchange-break layer on the "soft" magnetic underlayer (SUL), and an ultrathin nucleation film (NF) between the IL and the
7712207 Method of manufacturing a wrap around shield for a perpendicular write pole using a laminated ma May 11, 2010
A method for manufacturing a magnetic write pole and trailing wrap around magnetic shield for use in a perpendicular magnetic data recording system. The method includes the use of a hard mask structure with end point detection material embedded in a hard mask material. The novel hard
7712206 Method for manufacturing a magnetic write head having a trailing shield with an accurately contr May 11, 2010
A method for constructing a magnetic write head for use in perpendicular magnetic recording, the write head having a write pole with a trailing shield. After forming a magnetic write pole such as by masking and ion milling a magnetic write pole layer, a thin layer of alumina is depos
7710691 Three terminal magnetic sensor having an in-stack longitudinal biasing layer structure in the co May 4, 2010
In one illustrative example, a three terminal magnetic sensor (TTM) suitable for use in a magnetic head has a sensor stack structure which includes a base region, a collector region, and an emitter region. A first barrier layer separates the emitter region from the base region, and a
7710689 Narrow track read sensor May 4, 2010
A narrow track width read sensor having a high magnetoresistive sensitivity is made using a self-aligned process which requires the use of only a single resist mask. A plurality of sensor layers which includes a top layer of noble metal is deposited over a substrate. Optionally, a ce
7710685 Magnetic head main pole with leading and trailing edges of different lengths and progessively in May 4, 2010
If the length of a track-defining section from an air bearing surface varies due to tolerance during a head manufacturing process, the recording magnetic field changes, which involves the variation of the track width to be recorded on the medium. In accordance with an embodiment of t
7707707 Method for providing a temporary deep shunt on wafer structures for electrostatic discharge prot May 4, 2010
A method of temporarily protecting an electrically sensitive component from damage due to electrostatic discharge includes defining a shunt having first and second leads electrically connected in parallel with the component and separated by a gap. A portion of a shield layer is depos
7706108 Lead/shield structure for read head sensors April 27, 2010
One embodiment of the present invention is directed to a read head for a data storage device including a sensor for reading data from a data storage medium, a first shield disposed adjacent to the sensor and characterized as moment-compensated, and a second shield disposed adjacent t
7706104 Rotating disk storage device having a carriage formed with non-binding pads April 27, 2010
Embodiments of the invention enhance a mounting precision of a head gimbal assembly with respect to a carriage. In one embodiment, a rotating disk storage device comprises a magnetic disk; head gimbal assemblies each including a slider provided at a front end thereof and a mounting porti
7706099 Magnetic disk drive and method of controlling the same April 27, 2010
Embodiments of the present invention provide a magnetic disk drive, in which a disturbance component contained in an output signal from a rotational vibration detector, can be appropriately suppressed irrespective of frequency of the component, and a method of controlling the drive.
7706097 Magnetic disk drive with head retraction control April 27, 2010
Embodiments of the invention improve utility of a magnetic disk drive in which a head is retracted if the magnetic disk drive is in a dropping state. In one embodiment, an HDC/MPU provided in a magnetic disk drive judges whether the magnetic disk drive is in a dropping state based on an
7704613 Magnetic recording medium for high density recording April 27, 2010
A bit error rate is improved and, at the same time, an aging change due to thermal fluctuation is decreased. In one embodiment, a magnetic recording medium has first, second, third, and fourth magnetic layers stacked over the underlayer film on a substrate. The product (Brt2) of the resi
7703193 Methods and apparatus for controlling the lapping of a slider based on an amplitude of a readbac April 27, 2010
The lapping of a slider is controlled based on an amplitude of a readback signal which is produced from an externally applied magnetic field. A lapping plate is used to lap a slider which includes at least one magnetic head having a read sensor. During the lapping, a coil produces a
7702012 Infinite impulse response filter circuit and magnetic disk drive April 20, 2010
An infinite impulse response (IIR) filter circuit in accordance with an embodiment of the invention has transfer function coefficients that are adaptively changed. Using a Nth-order polynomial A(z) and a polynomial B(z) whose order is not higher than N, the transfer function is defined
7701669 Magnetic head slider having aperture to prevent fall forward and magnetic disk drive for using s April 20, 2010
When the flying height of a magnetic head slider lowers, there arises the problem that the magnetic head slider assumes a forwardly falling attitude and a front edge portion of a leading end of the magnetic head slider comes into contact with a magnetic disk surface, causing damage to
7701667 Perpendicular magnetic recording medium and magnetic storage apparatus using the same April 20, 2010
Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicul
7701664 Mounting spindle shaft in magnetic disk drive April 20, 2010
A magnetic disk drive has a problem in that when a shock in excess of a force used to fasten a spindle shaft to a cover is applied, the spindle shaft becomes inclined. Embodiments of the invention overcome this problem. In one embodiment, a cover is formed with a recessed portion at
7701564 System and method for angular measurement April 20, 2010
Embodiments of the present invention include a method for measuring an angle between a first surface and a second surface of an object. The method includes rotating an object around a center axis of the object and shining a light source perpendicular to the center axis of the object.
7698807 Method of manufacturing a magnetic sensor by multiple depositions of varying geometry April 20, 2010
Formation of the magnetic sensor layers of a magnetic sensor are separated into at least two depositions to reduce the dimension of the sensor. The free layer portion of the sensor is deposited at a different process step than the pinned layer portion. The top of the free layer stack can
7698085 Head stack assembly gramload process capability improvement April 13, 2010
A method for measuring a gramload corresponding to a read/write head, where the head is an inner head of a plurality of heads in a head stack assembly (HSA), involves a measurement instrument having a plurality of cam-rods for systematically placing each of various heads in a preloaded
7697246 Magnetoresistive sensor having biasing AFM layer in contact with free layer and a track width de April 13, 2010
A current perpendicular to plane (CPP) magnetoresistive sensor having a current path defined by first and second overlying insulation layers between which an electrically conductive lead makes content with a surface of the sensor stack. The current path being narrower than the width
7697245 CPP-GMR magnetic head having GMR-screen layer April 13, 2010
A spin-valve type magnetic head which has sufficiently high output is provided. In one embodiment, a structure in which high output coexists with high stability is achieved by letting a GMR-effect and a current-path-confinement effect manifest themselves at the same time in a GMR-scr
7697244 Magnetic head with stabilized ferromagnetic shield April 13, 2010
A magnetic head in one embodiment includes first and second ferromagnetic shield layers, first and second nonmagnetic read-gap layers positioned between the first and second ferromagnetic shield layers, a sensor used in a current-in-plane (CIP) mode, first and second longitudinal bias
7697242 Method for providing a self-pinned differential GMR sensor having a bias structure comprising la April 13, 2010
A method for providing a self-pinned differential GMR sensor and self-pinned differential GMR sensor. The differential GMR head includes two self-pinned GMR sensors separated by a gap layer. The gap layer may act as a bias structure to provide antiparallel magnetizations for the firs
7697238 Magnetic disk drive with load/unload mechanism having first and second protrusions April 13, 2010
In one embodiment, a disk drive has a solenoid and spring for turning a ramp mechanism about a rotating shaft. When the drive operates, since the ramp mechanism moves out from the magnetic disk by the force of the solenoid, the outer peripheral edge of a magnetic head that has formerly
7697235 Magnetic disk drive and base with guide April 13, 2010
Embodiments of the invention provide a magnetic disk drive that allows members to be mounted onto a base simply and accurately. In one embodiment, a magnetic disk drive comprises: a base; a disk assembly including at least one magnetic disk and mounted rotatably on the base; and an a
7697224 Storing AD sampled data of read/write channel into ECC SRAM April 13, 2010
An embodiment in accordance with the present invention enables storing in a memory, multi-bit data corresponding to analog signals read from a medium before being converted to single-bit data as recorded data. In an embodiment of the present invention, an AD converter is configured to
7697223 Monitoring a fly height of a magnetic transducer April 13, 2010
A method for monitoring a fly height of a magnetic transducer comprises flying the magnetic transducer at a distance of separation from a recording media. A read-back signal is read with the magnetic transducer from the recording media. The read-back signal is rectified to produce a
7696908 Techniques for reducing error propagation using modulation codes having a variable span April 13, 2010
Techniques are provided for reducing error propagation in encoded data using Fibonacci modulation codes. The Fibonacci modulation codes have a Fibonacci base with a variable span that limits error propagation. Some of the elements in the Fibonacci base have a larger span than limited
7695667 Method and apparatus for separating a stamper from a patterned substrate April 13, 2010
A method and apparatus are disclosed for separating a stamper from a patterned substrate. The method includes providing a substrate having a top and a bottom with an opening therein, providing a support mechanism configured to retain the substrate, providing a stamper having a formed
7694205 Method and apparatus for providing a read channel having combined parity and non-parity post pro April 6, 2010
A method and apparatus for providing a read channel having combined parity and non-parity post processing is disclosed. A post-processor combines parity and non-parity post processing to make both parity and non-parity corrections so that error events that cannot be detected by parity ma
7694105 Data storage systems that implement sector sets April 6, 2010
A data storage device has a data storage medium configured to store a first version of data in parent sectors. The data storage device is configured to store a second version of the data in child sectors. The child sectors have the same logical block addresses as the parent sectors.
7693593 Production planning method and production planning system April 6, 2010
Embodiments of the present invention provide a production planning method and system. Where a manufacturing apparatus is shared by a plurality of products in a production line, if a manufacturing (production) availability number is changed, a cause parameter is automatically investig
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