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8184394 |
Transducer head assemblies and modules
In one embodiment a transducer head assembly is disclosed having a head module. The head module comprises at least one media bearer element providing a media bearer surface, and a head element...
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8184392 |
Calibrating servos
Methods, systems, and apparatus, including computer program products are described for calibrating servos, and in some implementations, calibrating spiral servos for use in self-servo-write (SSW)...
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8182705 |
Method for producing thin film magnetic head having magnetoresistive effect element
A method for producing a thin film magnetic head including a magnetoresistive effect element (MR element) that has a magnetic sensor multi-layered film with a polygonal shape such that a vertex...
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8179626 |
Adaptive shock detection
Adaptive shock detection systems are provided according to various embodiments of the present invention. In one embodiment, an adaptive shock detection system comprises a shock sensing circuit, and...
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8179629 |
Flexure based shock and vibration sensor for head suspensions in hard disk drives
Systems and methods for flexure based shock and vibration sensor for head suspensions in hard disk drives. Specifically, this invention deals with operational shock and vibration management within...
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8174782 |
Methods for depositing lubricant onto disks and systems thereof
A system in one embodiment includes a disk; a reservoir having a selectively openable cover; a lubricant in the reservoir; and a sensor for detecting an event or condition that triggers opening of...
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8169736 |
Method and apparatus to position a head module comprising servo elements and a plurality of data elements
A method to position a head module, where the head module comprises at least one servo element and a plurality of data elements, where the servo element and each of the plurality of data elements...
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8169734 |
Method and apparatus for controlling head flying height in a disk drive
According to one embodiment, a disk drive includes a measuring module, a flying height controller, a detection module, and a controller. The measuring module is configured to measure the flying...
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8169732 |
Reducing written-in errors in servo patterns
A method for writing servo onto a disk of a hard disk drive. The method includes writing a plurality of spiral servo signals with a head. The spiral servo signals are used to generate position...
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8169733 |
Magnetic disk device
A magnetic disk device includes a disk that includes a plurality of tracks and magnetically stores therein data; a magnetic head that reads and writes data on the tracks; a data writing unit that...
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8169735 |
Zone servo writing using self servo writing
A system including a read module, a clock generator module, and a write module. The read module generates read signals in response to reading servo spirals from a magnetic medium of a hard disk...
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8164847 |
Fall detection device, magnetic disk device, and portable electronic apparatus
By detecting that a differentiation value of the absolute value of acceleration is lower than a negative threshold value DAth1 in a negative direction from a first stage (S1: Stationary state)...
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8159771 |
Controlling a heat resistive element with a pulse modulated signal
The disclosure is related to pulse width modulating a power signal to a heat resistive element of a transducer. The power signal may be a power output signal of preamplifier. The power signal may...
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8159775 |
Vibration identification and attenuation system and method
A vibration attenuation method comprising identifying a hard drive disposed on an electronic device and, based on the identity of the hard drive, attenuating an output of at least one operation of...
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8159772 |
Foldable portable electronic device and system and method for protecting hard disk
A foldable portable electronic device, a system and a method for protecting a built-in hard disk thereof are disclosed. The foldable portable electronic device includes a display and a main body....
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8159773 |
Method and apparatus for forming servo patterns on a magnetic-recording disk
A method for forming servo patterns on a magnetic-recording disk. The method includes moving a magnetic-recording head in an opposite direction to a pattern development direction, when there is a...
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8154818 |
Systems and methods for adaptive CBD estimation in a storage device
Various embodiments of the present invention provide systems and methods for adaptive channel bit density estimation. For example, various embodiments of the present invention provide methods for...
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8154820 |
Harmonic sensor
A system comprising: a read/write head configured to generate signals in response to the read/write head being at a particular fly height over a storage medium during a read operation; a weighting...
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8154819 |
Method of controlling flying height of magnetic head and disk drive using the method
The flying heights of magnetic heads of a disk drive are set using an FOD (flying on demand) method in a bank mode. A first signal for adjusting the flying height of a magnetic head is issued to...
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8154823 |
Information recording and reproducing apparatus, information recording and reproducing system, information processing apparatus and information reproducing apparatus
An information recording and reproducing apparatus 1 having a high efficiency of information transfer includes one or more recording media forming a plurality of recording surfaces, a plurality of...
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8154822 |
Analog techniques to decode signals extracted from computer-readable storage media
Methods, apparatuses, and systems implementing analog techniques to decode signals extracted from servo wedges of computer-readable storage media. A digital signal representing a repeatable runout...
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8154817 |
Compensation for different transducer translation path geometries
Method and apparatus for compensating for differences in translation path geometries of transducers used to access a data storage medium. A compensation profile is generated in relation to radial...
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8151064 |
Hybrid hard disk drive and data storage method thereof
A hybrid hard disk drive includes a hard disk drive controller to receive a plurality of write commands from a host, a buffer to receive and store write data, which are input through the hard disk...
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8149533 |
Load/unload control method and apparatus for a magnetic disk drive
According to one embodiment, an estimation method comprises measuring and creating. The measuring is configured to measure a head velocity and a terminal voltage of a coil of a voice coil motor at...
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8149541 |
System for controlling contact location during TFC touchdown and methods thereof
A system according to one embodiment includes a thin film stack having a magnetic transducer and a contact pad; and a heater in the thin film stack for inducing thermal protrusion of a media-facing...
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8144420 |
VCM PWM control architecture for power saving in hard disk drives
The power required by a voice coil motor (VCM) to maintain the head in the data region of a disk drive during an idle mode is further reduced. The current supplied to the VCM is switched on and...
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8144433 |
Hard disk drive
A hard disk drive including an actuator arm to pivot across a disk and having a read/write head disposed at an end of the actuator arm to read data from the disk and to write data to the disk, and...
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8144418 |
Test device for magnetic storage device, magnetic storage device, and method of manufacturing magnetic storage device
According to one embodiment, a test device for a storage device includes: a module configured to acquire from the storage device a value corresponding to a signal level read from a magnetic disk...
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8145441 |
Portable electronic apparatus for collecting impact information
A portable electronic apparatus for collecting impact information includes a body, a piezoelectric element, a processing element, and a storage element. The piezoelectric element covers the body...
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8144419 |
Disk drive detecting head touchdown from microactuator signal
A disk drive is disclosed comprising a head actuated over a disk surface by a microactuator, and a fly height actuator operable to adjust a fly height of the head. A servo control voltage is...
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8144417 |
Dynamic system control method
Techniques are provided herein for reducing vibrations in various modes of a dynamic system. One such technique comprises incorporating vibration limiting and sensitivity constraints into a partial...
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8139306 |
Electrical current as probe for modulation at head-disk interface
A system and method for measuring the modulation between a magnetic head and a magnetic storage medium, such as a disk, is disclosed. A magnetic read/write head is positioned above a magnetic...
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8139310 |
Fly height sensor control circuit
A disk drive is disclosed comprising a disk, a head for writing data to the disk, a first touchdown sensor, a second touchdown sensor, and control circuitry comprising a first current source...
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8139307 |
Hard disk drive apparatus, method of controlling flying height of magnetic head thereof, and recording medium to contain computer program therefor
A method of controlling a flying height of a magnetic head of a hard disk drive includes determining whether a difference between a measured flying height of the magnetic head measured by applying...
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8139308 |
Hard disk drive, method of controlling flying height of magnetic head thereof, and recording medium containing computer program thereon
A method of controlling a flying height of a magnetic head of a hard disk drive includes calculating a corrected flying on demand (FOD) voltage to correct a difference between a measured flying...
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8139309 |
Negative biasing a slider with respect to a disk to reduce slider wear and provide burnish rate control
In a method for negatively biasing a slider with respect to a disk to reduce slider wear and provide burnish rate control a negative bias voltage is generated between the slider and the disk...
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8134318 |
System and method of current shaping control for retract
A system for implementing current shaping for retract of a voice coil motor (VCM) includes drive circuitry coupled to drive the VCM according to a logic state of the system. Current shaping...
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8130463 |
Data recording apparatus and data recording method
A data recording apparatus of the present invention includes a head that records data signals by magnetizing a magnetic tape 10 and a recording control portion that controls the recording operation...
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8125725 |
Recording medium and recording apparatus for using test data recorded in a blank zone to refine data recording
Methods, systems and computer program products for measuring a distance between a write head and a read head are described. The measured distance allows the position of the write head (e.g., during...
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8125728 |
Disk drive, head-slider and method for controlling clearance of a read element and a write element in the disk drive
A disk drive. The disk drive includes a disk, a head-slider, a moving mechanism, and a controller. The head-slider includes a read/write element, a first heater element, a contact pad, and a second...
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8125727 |
Disk drive and method for adjusting common-mode voltage of an element on a head-slider
A disk drive. The disk drive includes a disk configured to store data, a motor configured to rotate the disk, a head-slider and a controller. The head-slider includes a slider configured to fly in...
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8116021 |
Synchronized rewriting of data
A hard disk drive (HDD) including a magnetic disk, the magnetic disk including a data track. The HDD also includes a synchronized rewrite controller for synchronizing a plurality of rewrites of a...
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8111485 |
Arm mounted shock sensor and flexible circuit routing
An actuator for supporting data transfer elements includes an arm, a flexible circuit assembly and a sensor. The flexible circuit assembly includes a stiffener having a mount feature and a...
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8112580 |
Disk drive having multiple disk surfaces accessible by a read/write head and nonvolatile memory for continuous data transfer
A magnetic recording hard disk drive (HDD) has at least one read/write head that accesses more than one disk surface. The HDD is able to transfer data to and from the host computer seamlessly...
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8112221 |
Navigation apparatus for vehicle
In an in-vehicle navigation apparatus, a present position is detected, an altitude of the present position is acquired from map data, and a temperature inside of a hard disk drive is acquired with...
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8107183 |
Method and device for hard drive shock event detection
A method and system for sensing the current applied to the motor of a data storage device and determining whether a shock event has occurred by processing the sensed current levels.
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8107186 |
Determination of timing based servo pattern type
In a magnetic tape drive having a servo read system with at least one read head, the system configured to read servo pattern information as a magnetic tape is moved longitudinally with respect to...
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8107185 |
Magnetic disk device including a sensor in a case
A magnetic disk device includes a magnetic head assembly, which includes magnetic heads, support plates, and a flexible wiring substrate that are integrally formed. The magnetic heads include...
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8102613 |
System, method and apparatus for determining track pitch in a hard disk drive to satisfy the requirements of both off-track capacity and adjacent track erasure
Track pitch in a hard disk drive is selected to satisfy the requirements of both off-track capacity (OTC) and adjacent track interference (ATI). The invention separately measures the track pitch...
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8102616 |
Magnetic recording medium, method of fabricating the same, and magnetic recording apparatus
According to one embodiment, there is provided a magnetic recording medium having a data region in which a plurality of recording tracks, each including magnetic dots arrayed in a down-track...
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