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7636212 |
Magnetic disk drive with control of sense current of magnetic head
An output of a magnetic head changes depending on the environmental temperature of a magnetic disk. In particular, under cold temperature conditions, an output of the head largely decreases mainly...
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7630163 |
Storage device and seek control method
A storage device includes a storage unit, a timer unit and a bias current applying unit. The storage unit stores, in advance, a value of a waiting time until application of a bias current to the...
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7630159 |
Resistance mode comparator for determining head resistance
An apparatus and method for determining a resistance of a magneto-resistive head. A current drawn by the head, in response to a fixed bias voltage across the head, is converted to a zero...
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7620121 |
DC balance compensation for AC-coupled circuits
A receiver has a first input port and a second input port both coupled to a differential amplifier through first and second input capacitors. A bias circuit coupled to the core side of the first...
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7561357 |
Decoder with energization control circuit
A multistage decoder circuit has an error reduction stage that includes an adaptation circuit. The adaptation circuit provides adaptable error reduction as a function of bit error rate. The...
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7561373 |
Bias compensation method and appropriate bias force profile generation method, recording media and hard disk drive
Provided is a method of compensating for a bias for efficient servo control of a hard disk drive, and optimally compensating for bias force based on the elapsed usage time of a hard disk drive, and...
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7545596 |
System and method for WORM magnetic recording
WORM safeguards are provided in a magnetic disk drive in which the disks are pre-magnetized or pre-recorded such that all magnetic domains on each recording surface are completely aligned pointing...
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7545595 |
Magnetic disk apparatus having an adjustable mechanism to compensate write or heat element for off-tracking position with yaw angle
A magnetic disk apparatus including: a disk holding data as magnetic information on a magnetic recording film; a head to perform writing and reading of the magnetic information; a rotary actuator...
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7532426 |
Method for erase process on recording surface of disk and disk drive apparatus
Embodiments in accordance with the present invention erase a desired area on a recording surface of disk or disk drive apparatus. According to an embodiment, a hard disk drive (HDD) performs erase...
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7522365 |
Magnetic storage systems and methods allowing for recovery of data blocks written off-track with non-constant offsets
A magnetic storage system includes a disk, a head, an actuator, a read channel, and a main controller. The main controller causes the head to read a data block of a selected track of the disk at...
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7515371 |
Channel postamble extension to de-gauss pole tips
A technique for de-gaussing the pole tips and yoke of a write transducer in a perpendicular magnetic recording system is provided. An oscillator in the read channel is configured to produce an...
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7492539 |
Method for controlling a burnish cycle to minimize cycle time
A method for controlling a burnish cycle to minimize cycle time is disclosed. MR sensor resistance measurements are used to monitor interference with the recording surface and when clearance is not...
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7489471 |
Bias calculation, bias compensation, and bias table editing methods for HDD, recording media storing computer programs for executing the same, and HDD using the same
In a hard disk drive (HDD), biases are measured across all zones of a disk, and nonlinear bias components are extracted. Upon a change in operational condition of the HDD, biases are measured at...
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7486476 |
Magnetic data system having a shield biasing circuit with resistor coupled between the shield and substrate
A magnetic data system according to one embodiment includes a head having a plurality of readers formed above a common substrate, each reader further comprising a shield and a sensor, a bias...
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7486475 |
Magnetic data system having bias circuit with bias resistor
A magnetic data system according to one embodiment includes at least one reader formed above a substrate, the at least one reader further comprising a shield and a magnetoresistive (MR) sensor. A...
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7471491 |
Magnetic sensor having a frequency filter coupled to an output of a magnetoresistance element
A magnetic sensor includes a magnetoresistance element having a peak of a thermal fluctuation strength of magnetization under a magnetic field having a certain frequency, a frequency filter...
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7468852 |
Method of demagnetizing magnetic recording medium and apparatus for carrying out same
Embodiments of the invention improve efficiency in alternating-current demagnetization of a magnetic recording medium. In specific embodiments, magnet fields in a direction slanting to an easy...
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7460324 |
Head amplifier circuit with function for degaussing residual magnetism of recording head
In a data-recording mode, a driver circuit supplies a recording head with a recording current corresponding to write data. In a degaussing mode, the driver circuit supplies the recording head with...
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7450328 |
Method for recording bursts on a disk and related apparatus
Embodiments of the invention provide a method for recording bursts on a disk and a related apparatus. In accordance with an embodiment of the invention, a method for recording bursts on a burst...
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7440212 |
Method and systems for a highly error tolerant tape format
Described herein are media drives for writing information to a media (e.g., a tape media), systems for storing information on a storage medium, and methods of writing information to a media. The...
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7440213 |
Apparatus and method for controlling remnant magnetization in a magnetic recording head
The present invention provides a magnetic writer. The magnetic writer comprises a write circuit, a write pole, a first write coil for inducing a first magnetic field in the write pole by a first...
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7411756 |
Method and apparatus for write head demagnetization
An apparatus and method for demagnetizing a write head of a disc drive. Under control of a clock oscillator, synthetic demagnetizing pulses are generated and applied to a writer-driver bridge. Also...
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7411753 |
Method and apparatus for magnetization test of write head in a disk drive
A disk drive of a perpendicular magnetic recording system has a magnetization test function, for testing the magnetized state of a write head. The disk drive is provided with a write driver and a...
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7397622 |
Method and apparatus for improving servo stability in read heads while writing
A method and apparatus for improving servo stability in read heads while writing is disclosed. In one embodiment, a magnetic storage device includes a disk surface and a transducer. The disk...
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7382562 |
Preamplifier for use in data storage devices
A preamplifier that includes an input configured to receive a preamplifier control signal and a fault detection circuit configured to monitor the preamplifier control signal received at the input...
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7372653 |
Degauss waveform generator for perpendicular recording write head
Embodiments of the invention provide a hard disk drive that is capable of performing degaussing promptly and properly and a recording method for use with such a hard disk drive. A hard disk drive...
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7362530 |
Amplifier apparatus for use with a sensor
An amplifier apparatus for use with a sensor includes: (a) a first and a second amplifying circuit segment coupled with the sensor and cooperating to effect substantially balanced handling of...
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7339760 |
Integrated bias and offset recovery amplifier
A preamplifier circuit is connected to a transducing head, and has integrated bias circuitry and offset recovery circuitry. The offset recovery circuitry is activated in response to a transition...
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7330336 |
Dual polarity bias for prolonging the life of a heating element in magnetic data storage devices
A magnetic read/write head having a heating element to induce a desired amount of thermal protrusion in the read and write elements to control the fly height of the read and write elements over a...
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7319569 |
Servo writer
A servo writer is provided, which applies DC magnetization to a zone of a magnetic tape that is in advance subjected to AC erasing and writes a servo signal onto the DC magnetized zone. The servo...
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7280299 |
Recording method for magnetic recording medium, recording device for magnetic recording medium and magnetic recording medium
After a DC erasing is performed in a direction by permanent magnets on a servo signal recording part, servo signals are recorded in the signal recording area of the servo signal recording part by a...
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7269213 |
Waveform equalizer having a tap coefficient monitoring unit
A waveform equalizer having a delay element of a feed-forward filter into which a reception signal is inputted is connected via a tap arrangement control switch to a weighting device The output of...
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7265924 |
Servo writer with multiple servo write heads and a method of writing with the servo writer
Disclosed is a servo writer in which a servo write head is easy to exchange, and which writes, to magnetic tapes, a servo signal from which a reading signal of the improved SN ratio can be...
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7265926 |
High speed hard disk drive with symmetric writer
A disk drive data storage system, comprising a magnetic disk a head for writing data to the disk, and circuitry for providing a first voltage (HWX) to a first node (N 1 ) and a second voltage (HWY)...
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7265925 |
Recorded data deleting device for hard disk
A recorded data eraser 1 defines therein a cavity 2 for insertion of a hard disk drive 20 in the cavity 2 and includes a coil 4 being arranged around the cavity 2 so as to encircle the...
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7256954 |
Adaptive equalizer
An adaptive equalizer comprising a variable filter which equalizes a digital input signal which is input in a time sequential order, an adaptive controller unit which updates a filter coefficient...
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7253980 |
Technique for recording bias current glitches in magnetoresistive heads
Circuitry for detecting and recording latches in read bias current may include circuitry for generating a reference voltage, a pair of current to voltage converters to convert the bias and...
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7253978 |
Methods and apparatus determining and/or using overshoot control of write current for optimized head write control in assembled disk drives
The invention includes a testing method which may be applied to at least one writer in a disk drive during the self-test phase to generate write parameters, focused on the Over Shoot Control (OSC)...
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7251091 |
Current-sense bias circuit for a magnetoresistive head and method of sensing a current therethrough
The present invention provides a current-sense bias circuit for use with a magnetoresistive head. In one embodiment, the current-sense bias circuit includes a voltage biasing portion configured to...
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7224544 |
Method and device for recording data and erasing servo data
After a DC erasing is performed in a direction by permanent magnets on a servo signal recording part, servo signals are recorded in the signal recording area of the servo signal recording part by a...
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7215497 |
Adjacent track data guarantee processing method and disk device
A guarantee processing method guarantees the data of an adjacent track in the case of a write fault when there is a possibility of an off track write. Even if a write fault is detected or an offset...
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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...
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7206155 |
High-speed, low power preamplifier write driver
A write driver circuit ( 38 ) uses a matching resistors (R 0 , R 1 ) to match the impedance of the head ( 32 ) disposed between output nodes (OUTP, OUTN). Control circuitry (Q 4 , Q 5 , Q 6 , Q 7 ,...
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7191083 |
Method and apparatus for calibrating data-dependent noise prediction
Disclosed herein is an apparatus and method of calibrating the parameters of a Viterbi detector 138 in which each branch metric is calculated based on noise statistics that depend on the signal...
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7187513 |
Differential magneto-resistive head pre-amplifiers for single polarity power supply applications
Magneto-resistive (MR) head pre-amplifiers for single polarity power supply applications are presented. An exemplary pre-amplifier includes a bias network coupled to first and second input...
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7173786 |
Magnetic disk drive apparatus and method for compensating characteristics of magnetic disk drive apparatus
A magnetic disk drive apparatus includes a magnetic disk with a data region, a magnetic head located in a region of the magnetic disk other than the data region or outside of the magnetic disk...
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7170700 |
Method of determining side track erasure in a disk drive
A method of determining side track erasure in a disk drive having a disk and a transducer. A target track and one or more side tracks proximate to the target track on the disk are selected, and...
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7167330 |
Over-writing data in a recording system
A recording system stores recording cycle information identifying the parameters for recording user data on a particular data sector. During a subsequent operation, the recording system employs the...
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7142388 |
Servo writer and servo writing process
A servo writer according to the present invention is a servo writer which writes a servo signal on a servo band of a magnetic tape. It comprises a magnetic tape driving system in which a magnetic...
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7130143 |
Apparatus, system, and method for measuring magnetoresistive head resistance
An apparatus, system, and method are disclosed for measuring magnetoresistive head assembly resistance. A measurement module measures a reference voltage across a reference resistance while...
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