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Match Document Document Title
7436619 Head floating amount control method and unit, storage apparatus and computer-readable program  
A head floating amount control unit control a head floating amount of each of a plurality of heads respectively having a heater, with respect to a recording medium, by detecting contact between...
7428115 Magnetic hard disk drive with countermeasure against spike noise  
Embodiments of the invention provide a countermeasure against spike noise maintaining the data reliability of a magnetic recording layer. In one embodiment, the magnetic domain state right below...
7411752 Head vibration detection device and method  
A disc drive including a transducer supported on the head suspension assembly to induce a transducer signal in response to head vibration. The transducer signal is level detected to output a level...
7397621 Servo pattern characterization on magnetic disks  
In one embodiment, a surface analyzer system comprises a radiation targeting assembly to target radiation onto a surface, a reflected radiation collecting assembly that collects radiation reflected...
7373074 Video recording apparatus  
A video recording apparatus includes a tuner for receiving television broadcast waves, an intermediate frequency circuit for demodulating intermediate frequency (IF) signals outputted from the...
7330320 Method and apparatus to limit DC-level in coded data  
In a perpendicular magnetic recording system, the data that is being written by the write channel is fed back into the read channel. The read channel processes the data and decides if the written...
7321476 Method and system for determining contact potential in a hard disk drive  
A method and system for determining contact potential voltages between a slider body and a hard disk of a hard disk drive. In embodiments of the present invention, at least one continuous negative...
7289284 Stray field detector, magnetic disk drive, and method of head escaping  
Embodiments of the invention prevent demagnetization or degaussing of recorded magnetizations, even if a stray field is applied. In one embodiment, an output of a read head including a...
7286311 Thermal asperity compensation in perpendicular recording  
A data detection circuit includes a transient detector that senses transient events in data. A first data detector path applies a first equalization target to generate a first bit stream from the...
7274523 Read head preamplifier with thermal asperity transient control  
A preamplifier for correcting for thermal asperity transients in disk drives using magneto resistive read heads. The preamplifier has an input gain stage receiving a signal from the read head and...
7271975 Controlling head flying height in a data storage device  
Embodiments of the invention enable the flying of a slider to be lowered and increase recording density with a simple configuration in a magnetic disk apparatus. In one embodiment, a magnetic disk...
7271967 System and method for determining whether defect in perpendicular recording disk drive is from thermal asperity or defect in magnetically soft underlayer  
A method for determining whether a spike in a read back signal from a read head positioned over a perpendicular recording disk having a magnetically soft underlayer (SUL) is caused by a defect in...
7251908 Magnetic disk drive to alleviate damage from thermal asperity  
Embodiments of the invention prevent or alleviate head damage ascribable to the TA-causing sections (projections) of disks (TA is thermal asperity). With respect to a TA-causing section that has...
7251090 Pattern dependent write equalization  
A pattern dependent write equalization method is disclosed. The method includes identifying a trait of a data pattern in a stream of write data. A characteristic of a write equalization signal is...
7248424 Nonlinearity measuring method, nonlinearity measuring unit, magnetic recording/regenerating unit and LSI for magnetic recording/regenerating  
A nonlinearity measuring method capable of measuring NLTS with a higher precision while taking the state of magnetization inversion of a preceding bit string into consideration. A constitution...
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...
7233451 Method for actively controlling electric potential at the head/disk interface of a magnetic recording disk drive  
An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the...
7227709 System and method for providing head amplitude characterization  
To calibrate the VGA of a read head, test signals from a DAC are input to the VGA and the output of the VGA is observed, with the gain of the VGA being adjusted as appropriate. So that the DAC need...
7215495 System and method for determining head-disk contact in a magnetic recording disk drive  
A system and method for determining head-disk contact (HDC) in a magnetic recording disk drive uses the signal from the magnetoresistive (MR) read head. The analog MR signal is digitized and input...
7209304 Systems, apparatus, and methods to determine thermal decay characterization from an equalized signal-to-noise ratio of a magnetic disc drive device  
The thermal decay of data written to a magnetic mass storage medium is determined by measuring and analyzing the time-domain equalized-signal-to-noise ratio (ESNR) and equalized...
7206159 Method and apparatus for rejecting contact-induced disturbances  
A method and apparatus for compensating for head-to-disk contact-induced disturbances in a hard disk drive is disclosed. The method includes determining topographical variations across a surface of...
7206150 In situ media defect image analysis  
The present invention is a method or apparatus configured for analyzing a data storage device containing a transducer head positionable adjacent a data storage media surface. First, a defect is...
7199960 Disk drive with AC exciter for head/disk interface  
A disk drive includes a disk for storing information, a head with a transducer that writes data to and reads data from the disk, and an AC power source. The head is suspended adjacent to the disk...
7184230 System and method for processing track identifier errors to mitigate head instability in data storage devices  
A system and method for processing track identifier errors to mitigate head instability in data storage devices is disclosed. The system and method includes computing a track id differential...
7180694 Recording and/or reproducing apparatus, recording and/or reproducing method, recording medium and program  
A recording apparatus of a tape-shaped magnetic recording medium includes a transfer unit, a recording head, a signal-processing unit and a control unit. The transfer unit transfers a tape-shaped...
7173784 Apparatus for providing data dependent detection in a data read channel  
An apparatus for providing data dependent detection in a data read channel is disclosed. Parameters in a read channel are dynamically adjusted according to data dependent noise. For example, a...
7139145 Cluster-based defect detection testing for disk drives  
Disclosed are techniques related to cluster-based defect detection testing for disk drives. A disk drive comprises a disk, a moveable head to scan the tracks of the disk, and a defect detection...
7130139 Write velocity identification  
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...
7113355 System and method for detecting head instability  
Embodiments of the present invention relate to systems, methods, and computer readable media for calibrating storage devices such as hard drives. A testing system is connected to a group of storage...
7113354 Media noise low-fly height test for a disc drive  
Method and apparatus for characterizing the flight characteristics of a read/write head. A disc is accelerated to a selected rotational velocity sufficient to aerodynamically support the head. The...
7110197 Method for determining a type of head, and method for optimizing a write parameter using the head type determining method in a hard disc drive  
A method for determining a type of a head in a hard disc drive, the head being a normal head, a weak head, or an ATE (Adjacent Track Erasure) head, and a method for adjusting a write parameter...
7102838 Methods of optimizing recording current and setting recording density of hard disk drive  
A method optimizing a recording current in consideration of operating temperatures of a hard disk drive and a method of setting a recording density in consideration of tracks per inch (TPI) or...
7088532 Head-disk interface preconditioning using write current before servo track write  
Disk drive preconditioning allows the head-disk interface to be burnished or worn so that head-disk interference is reduced or eliminated before servo track writing. The head is positioned closer...
7075741 System and method for automatically determining magnetic eccentricity of a disk  
An embodiment of the present invention includes receiving a disk having a servo pattern and automatically identifying the center of the servo pattern. The present invention also automatically...
7068451 Disk drive estimating a sinusoidal error in a wedge time period due to eccentricity in disk rotation  
A disk drive and method for estimating a sinusoidal error in a wedge time period is disclosed. An estimated WTP is calculated according to:
7068449 Slider fly control  
A disc drive data storage system is disclosed that includes a disc storage medium having a disc surface. The system also includes an armature and a slider coupled to the armature. The slider...
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...
7046463 Low flying head detection using readback signal amplitude modulation  
A method for determining whether a data storage device read/write head is a low-flying read/write head or a non low-flying read/write head. A disc attached to a spindle motor is accelerated to an...
7027263 Apparatus for look-ahead thermal sensing in a data storage device  
A slider having leading and trailing edges is configured to fly on an airbearing above a data storage disk rotating from the leading edge to the trailing edge. Read and write heads are mounted on...
7027245 Apparatus for providing head amplitude characterization using gain loops  
An apparatus for providing head amplitude characterization using gain loops is disclosed. A variable gain amplifier (VGA) receiving input signals and generates a VGA output signal. A...
7027243 Apparatus for providing head amplitude characterization  
An apparatus for providing head amplitude characterization is disclosed. A DAC is used to apply known signals to a variable gain amplifier in the front end of a read channel. The signal is...
7023641 Recording current control method and magnetic disk drive  
In a magnetic disk drive, a writing element and its surrounding area thermally expand due to the heat generated by a write head coil. The transient phenomenon of such thermal expansion may invoke...
7023638 Data storage device, data read correction mechanism, and data read control method  
A correction mechanism for use in a data storage system that allows data to be read even if the recorded data has been phase shifted.
7023635 Recording/reproducing apparatus  
A recording/reproducing apparatus capable of switching over among a plurality of heads with high precision, wherein the apparatus is provided with: a recording/reproducing unit for...
7016139 Magnetic recording disk drive with actively controlled electric potential at the head/disk interface for wear and durability control  
An electrical potential difference between a slider body and a hard disk of a hard disk drive is eliminated based on the flying-height spacing of the slider body between the slider body and the...
7009792 Method and apparatus for data reproducing in a disk drive  
A perpendicular magnetic recording type of disk drive having function of removing a component of a shift in a base line of a reproducing signal is to be disclosed. The disk drive has a read channel...
6999260 Shock detection device, disk drive, shock detection method, and shock detection program  
A shock detection device can detect a slight shock without mis-detection of shocks due to noise in a shock sensor signal. The shock detection device is adapted to output a shock detection signal...
6999256 Methods of measuring TPTP of magnetic head and controlling recording current  
A method of measuring the degree of thermal pole tip protrusion (TPTP) of a magnetic head and controlling a recording current in consideration of the degree of TPTP, in relation to a hard disk...
6995934 Noise suppressed data storage media  
Magnetic data storage media having recording layers that include microscopic surface protrusions are described. A recording head of a magnetic drive may contact the protrusions, i.e., the...
6995932 Thermal asperity compensation in perpendicular recording system  
A detection circuit or a perpendicular recording system includes a channel circuit to amplify the read data signal. A transient detector generates a transient detect signal. A first path and a...
Matches 1 - 50 out of 378 1 2 3 4 5 6 7 8 >