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7549215 |
Method for manufacturing a magnetic head for perpendicular magnetic data recording
A structure and method for performing magnetic inductance testing of write heads formed on a wafer. The structure and method allows for the effective inductive testing of magnetic write heads at...
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7511486 |
Non-contact magnetic sensor system
A non-contact sensor system according to one embodiment comprises a substrate having at least one sensor element, the at least one sensor element being directed towards at least one data track on a...
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7506282 |
Apparatus and methods for predicting and/or calibrating memory yields
An apparatus and methods for predicting and/or for calibrating memory yields due to process defects and/or device variations, including determining a model of a memory cell, identifying a subset of...
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7405907 |
Adjacent magnetoresistive read head and method for obtaining position error signal
A read head for reading magnetically stored data in adjacent tracks of a medium has at least two elongate bodies, each having at least one magnetoresistive part. The magnetoresistive parts have...
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7355399 |
Non-contact sensor system
A non-contact sensor system according to one embodiment includes a substrate having a substantially planar surface with at least one sensor element mounted to the substrate, the at least one sensor...
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7352175 |
Probe card method
A probe card method, wherein a base supports a probe pin and an electromagnet. When the probe pin contacts a magnetic-sensor terminal on a chip on a wafer, magnetic force is applied to a...
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7307418 |
Systems for recording position information in a magnetic layer on a piston rod
Described are system for recording piston rod position information in a magnetic layer on the piston rod. A piston rod has a magnetically hard layer formed thereon to provide a recording medium. A...
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7295002 |
Vacuum chuck spinstand for testing magnetic heads and disks
A spinstand having a vacuum chuck clamping mechanism for securing magnetic discs includes a cap ( 9 ) and a base ( 10 ). A disk-to-be-clamped is held between the cap ( 9 ) and the base ( 10 )....
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7288935 |
System, method, and apparatus for dynamic electrical testing of workpieces by multiplexing test sites with shared electronics
A dynamic electrical tester (DET) for testing head gimbal assemblies (HGA) is disclosed. The DET simulates disk drive operation while significantly reducing tester capital investment. Multiple HGAs...
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7276900 |
Magnetic characteristic inspecting apparatus and inspecting method using it
A magnetic characteristic inspecting apparatus including a plurality of disk rotating devices or a plurality of magnetic heads include a unit for switching output signals of write signal production...
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7249406 |
Method to detect magnetic pole defects in perpendicular recording heads at wafer level
The perpendicular magnetic head fabrication and testing method includes the additional fabrication of magnetic pole testing structures in the kerf area of the wafer substrate. Particularly,...
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7248039 |
Disk pack swap process for evaluating magnetic recording performance
A method for testing electromagnetic characteristics of magnetic media while maintaining consistent performance of a read/write head and recording channel is disclosed. The disclosed method is...
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7248040 |
Disk testing apparatus, disk testing method, computer-readable recording medium that stores a disk testing program, and disk apparatus including a disk to be tested
A disk testing apparatus that sets a predetermined condition of a recording density for a disk apparatus, and conducts a test relating to at least readout of data stored in the disk apparatus...
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7212000 |
Detection of a defective disk of a hard disk drive
A method and apparatus for detecting a defective disk for a hard disk drive. The method includes placing a disk into a tester so that a first side of the disk is adjacent to a first head of the...
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7208948 |
Non-contact, high resolution magnetic sensor system
A non-contact magnetic sensor system according to one embodiment includes a substrate and a magnetic medium spaced from the substrate and having a data track thereon. A sensor element is mounted to...
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7196513 |
Method for testing magnetic hard disk or magnetic head
A testing method for a magnetic hard disk or a magnetic head in a test system includes a moving step in which the magnetic head, which moves to fly closely over the magnetic disk, moves to a...
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7194802 |
Tool for certifying a head-gimbal assembly
A device and method for testing a slider of a head-gimbal assembly during disc drive manufacturing. The device includes a test disc, an actuator arm and a control module. The test disc has a first...
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7183763 |
Probe card
A probe card includes a base that supports a probe pin and an electromagnet. When the probe pin contacts a magnetic-sensor terminal in on a chip on a wafer, magnetic force is applied to a...
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7173415 |
System, method, and apparatus for detecting signal-to-noise ratio decay in perpendicular magnetic recording
A magnetic test module runs on a spin stand to detect amplitude decay and noise evolution at the same time. Signal-to-noise ratio (SNR) decay is directly measured. The recording performance is...
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7165462 |
Individual slider testing
Systems and methods of testing individual sliders are disclosed. One embodiment is a test system that includes a mechanical stress system, a quasi-static measurement system, a transport system, and...
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7141969 |
X-Y spinstand platform with flexure-coupled platen
An XY platen positioning system includes a fixed base rigidly coupled to a essentially planar surface. An XY intermediate plate is slidably coupled to the fixed base, such that the XY intermediate...
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7131346 |
Spin stand testing system with fine positioner for head stack assembly
Head stack fixtures for securing head stack assemblies to spin stand testing systems, and spin stand testing systems incorporating such fixtures, are disclosed. Exemplary head stack fixtures...
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7129702 |
XY stage, head carriage and tester of magnetic head or magnetic disk
An XY stage includes a movable frame having a rectangular space inside thereof and movable on a reference base along one of X and Y axes, a first drive source provided in the reference base for...
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7124625 |
Glide-height disk-tester and method of operation
A glide-height disk-tester operates with the test disk rotating at a predetermined constant rotational speed and uses a glide head with an electrically-resistive heater and a thermally-responsive...
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7124654 |
Method for determining a microactuator range of movement
A spin stand testing system is used to determine a positioning range of a microactuator disposed on a head gimbal assembly. The microactuator is configured to laterally translate a read sensor of a...
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7109701 |
Method for testing magnetic hard disk or magnetic head
A testing method for a magnetic hard disk or a magnetic head in a test system includes a moving step in which the magnetic head, which moves to fly closely over the magnetic disk, moves to a...
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7075294 |
Method of inspecting thin-film magnetic head and method of making thin-film magnetic head
In the method of inspecting a thin-film magnetic head, a thin-film magnetic head provided with a magnetoresistive film having a free layer whose magnetization direction changes depending on an...
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7064539 |
Method for hard disk drive flip disk diagnostics
A method for identifying a problem with a magnetic disk, comprising testing both sides of a disk for read errors using a pair of heads, flipping the disk 180 degrees, again testing both sides of...
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7064659 |
Glide testing of disks with calibration confirmation testing by inducing collision of the slider with production disk surface
A method is presented for glide testing a disk which tests the glide head fly-height by inducing a collision between the glide head and a disk under test. The glide test system is initially...
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7057385 |
Method of inspecting magnetic recording medium based on contact duration time
A magnetic recording medium inspection method detects small protrusions that constitute defects on the surface of a magnetic recording medium. The method includes flying a glide inspection head at...
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7051423 |
Testing method for a head IC
This invention relates to a testing method for a head IC which makes it possible to simplify checking of the head. The head IC is installed on a head suspension, and probes are placed on terminals...
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7026810 |
Method for testing or recording servo signal on perpendicular magnetic recording media
An object is to automatically detect the positions of spike noise, create a distribution diagram, and perform pass/fail decisions. The cross-correlation function of the signal waveform from a...
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7015689 |
Connection method for probe pins for measurement of characteristics of thin-film magnetic head and characteristic measurement method for thin-film magnetic head
A method of connecting a plurality of probe pins to a plurality of first external connection pads, which are provided on a head gimbal assembly and are electrically connected to a plurality of...
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7009391 |
High throughput missing pattern detector for servo printed recording media
The present invention provides a method for detecting missing servo patterns on printed recording media. In general, the method first comprises the step of generating a map of anticipated servo...
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7005849 |
System and method for high-speed massive magnetic imaging on a spin-stand
A system ( 10 ) and method for high-speed massive magnetic imaging on a spin-stand ( 12 ) is provided. The system ( 10 ) includes a spin-stand system ( 12 ) for driving a rotational spindle ( 20 )...
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6989671 |
Detection of slider-disk interference using a dynamic parametric test
A method is described for calculating head disk interference (HDI) using a dynamic parametric test. In one embodiment, HDI is calculated based on an actual and ideal sensitivity profile based on a...
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6989949 |
Performance test method of head gimgal assembly with precise positioning actuator
A method of testing a performance of the HGA has a step of writing information from the at least one thin-film magnetic head element onto a magnetic disk with driving the actuator for displacement...
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6987628 |
Method and apparatus for high fly write detection using stored amplitude values
A method and apparatus for detecting a high flying condition of a transducer head in a computer disk drive is provided. The method and apparatus allow the detection of high fly write events that...
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6982842 |
Predictive disc drive failure methodology
A method of performing predictive failure analysis (PFA) for a disc drive includes maintaining at least two primary error counts during operation of the disc drive. The primary error counts each...
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6934100 |
Method of measuring non-linearity in magnetic recording/reproduction, device for magnetic recording/reproduction and LSI for magnetic recording reproduction
Method of accurately measuring various kinds of non-linear transition shifts (NLTSs) in the magnetic recording/reproduction using an MR-type reproducing head is provided. According to the method,...
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6894489 |
TESTING APPARATUS FOR CONDUCTING A TEST ON A MAGNETIC RECORDING MEDIUM OR A MAGNETIC HEAD, THROUGH RECORDING TEST DATA ON THE MAGNETIC RECORDING MEDIUM AND REPRODUCING RECORDED TEST DATA THEREFROM BY MEANS OF THE MAGNETIC HEAD
A testing apparatus of a magnetic recording medium for conducting a test on the magnetic recording medium by using reproduced data obtained through reproduction of the magnetic medium, including a...
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6891688 |
Disk processing apparatus including means for providing evaluation result of ranking a plurality of disks
The occurrence frequency of read error occurring when the data on one disk is read by a read unit is compared with that when the data on another disk is read by the read unit and the evaluation...
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6879152 |
Evaluation system and method of measuring a quantitative magnetic field of a magnetic material
The magnetic field intensity distribution of a magnetic material sample, such as a magnetoresistive device, is measured with a probe having a tip portion of a magnetic material to which current is...
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6844724 |
Compensation technique for measurement of magnetic moment and anisotropy field of perpendicular recording media with soft underlayer
A method of measuring the magnetic moment (M r t) and anisotropy field strength (H k ) of a perpendicular magnetic recording medium comprising a planar-surfaced perpendicular recording layer and a...
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6828784 |
METHOD AND APPARATUS DETECTING BASE LINE POPPING NOISE IN A READ HEAD AND STABILIZING THE MAGNETIC DOMAIN OF MERGED MAGNETORESISTIVE READ-WRITE HEADS USING DC WRITE CURRENT AND READ BIAS CURRENT FOR AN ASSEMBLED DISK DRIVE
Methods and apparatus are disclosed determining the presence of base line popping noise for a read head inside an assembled disk drive, as well as, determining read bias conditions for operating...
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6822815 |
Abnormal magnetoresistive element detection for a disc drive
A magnetoresistive element measurement circuit configured for measuring resistance of a magnetoresistive element biased by a current source is disclosed. In a preferred embodiment, the measurement...
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6798594 |
Position sensing system for a disc drive using micro-servo sectors and side-by-side R/W recording elements
A transducer position sensing system in a disc drive to take frequent data measurements from micro-servo sectors on the disc and to interpret the information to predict recording failures. The disc...
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6775078 |
Fast magneto-resistive head open and short detection for both voltage and current bias preamplifiers
A circuit and method are presented for detecting a fault in a magneto-resistive head ( 18 ). The circuit includes a bias circuit ( 50 ) to produce a bias voltage across the head ( 18 ) and a pair...
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6762914 |
Method for the rapid measurement of magnetoresistive read head dimensions
An automated production process for the screening of the read-width (RW) and/or the stripe-height (SH) for every magnetoresistive (MR) read sensor element in a wafer substrate. The method of this...
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6731448 |
Accurate resistance measurement for magnetoresistive head
A magnetic data storage and retrieval system includes a magnetoresistive head, a resistor, a preamplifier circuit, a voltage measurement circuit, and a resistance calculation circuit. The...
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