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7626777 |
Variable threshold bipolar signal peak detector
A method and apparatus for detecting signal peaks caused by a thermal asperity event in a magnetic recording media to reduce data reading errors introduced by the thermal asperity event. A common...
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7605993 |
Write current boosted head amplifier
Embodiments in accordance with the present invention provide a disk drive and a control method in the disk drive which can obtain good recording performance by amplifying the write current...
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7602578 |
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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7561358 |
Multi-register read channel optimization
A method for optimizing read/write channel parameters of a hard disk drive. The process includes measuring a first bit error rate of a head using an initial set of read/write channel parameters and...
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7558014 |
Programmable high pass amplifier for perpendicular recording systems
A high pass amplifier comprises a first amplifier including an input and an output. A second amplifier includes an input that communicates with the output of the first amplifier and an output. A...
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7551384 |
Systems and methods for calibrating a read/write channel of a hard disk drive
A read/write channel for a hard disk drive comprising at least one analog read component and a fly height control system. The fly height control system controls fly height based on a current fly...
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7551383 |
Adjusting voltage delivered to disk drive circuitry based on a selected zone
A disk drive includes a disk comprising a plurality of zones, a clock for generating a timing signal having a timing frequency, a voltage controller for providing a supply voltage, and circuitry...
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7545594 |
Method and system for removing signal defects in MR head signals
The disclosure describes a data storage system that includes a signal defect correction system for removing signal defects in magnetoresistive head playback signals. The signal defect correction...
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7532427 |
TMR/GMR amplifier with input current compensation
An amplifier system with feedback current cancellation comprises an amplifier with at least one stage, a feedback network, first and second replica circuits, a buffer, second and third resistances,...
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7522368 |
Differential voice coil motor control
A disk drive controller including a differential voice coil motor control function is disclosed. The differential voice coil motor control function includes an on-chip compensation network for the...
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7518813 |
Methods and structure for detecting anomalous events in a disk drive using VGA variance
Methods and structures for detecting touchdown of the read/write head on its recording surface or for detecting other read signal amplitude modulations as proportional to variance of the value of...
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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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7508617 |
Fly height compensation using read gain control loop
Apparatus and methods are disclosed that regulate head fly height so as to compensate for variation in height of a disk surface. An exemplary apparatus includes a circuit that detects disk height...
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7508613 |
Method and apparatus for balanced shield shunts, leads and pads for electrical noise reduction in read heads
A symmetrical read element circuit for reducing electrical and magnetic noise using signal processing, such as a differential preamplifier. The circuits are symmetrically created on both sides of...
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7495854 |
Dynamic method for asymmetry compensation in a storage read channel
Provided is a dynamic method for asymmetry compensation in a storage read channel. An asymmetry cancellation component in communication with an analog-to-digital converter receives an analog signal...
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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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7466200 |
Composite output stage for hard disk drive preamplifier
An apparatus for supplying a load current. The apparatus comprises a first differential amplifier producing a differential output signal and an output buffer comprising a first and a second...
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7463443 |
Reduced hardware control circuit device, with current loop for broad band hard disk drive applications
A reduced hardware control circuit device includes a current loop for broad band Hard Disk Drive applications. The current loop detects the value of the current flowing on the coils of a voice coil...
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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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7457067 |
Method of controlling a recording current, and magnetic disk device
Embodiments of the invention make it possible to conduct stable recording on a magnetic disk, even in case of changes in flying height due to thermal protrusion. In one embodiment, a compensatory...
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7417817 |
Write driver circuit for magnetic data storage systems
A write driver circuit for a magnetic storage medium includes a first write driver sub-circuit that has an output that communicates with a first node of a write head. The first write driver circuit...
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7394605 |
Broadband transmission path apparatus, suspension assembly and storage medium apparatus
A broadband transmission path apparatus connects a head IC and a head in a suspension. Either one of the head IC and the head is assumed as a transmission terminal and the other is assumed as a...
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7375909 |
Write driver with power optimization and interconnect impedance matching
A write driver for driving a write current through a write head connected to the write head by an interconnect or flexible transmission line. The write driver includes a circuit matching an output...
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7365928 |
Write driver with improved boosting circuit and interconnect impedance matching
A write driver driving a write current through a head connected to the write head by an interconnect. The write driver includes a circuit matching output resistance to the odd characteristic...
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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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7327103 |
Driver and method for control of voice coil motor in disk drive
A driver for a voice coil motor in a disk drive includes a sensor that provides a sense current by sensing a coil current in the voice coil motor, a comparator that provides an error current by...
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7301715 |
Preamplifier fly height control (FHC) driver and sensing circuit
Managing temperature of a read/write head ( 120 ) in a disk drive system in which there is a power variance due to different operation modes. A circuit device ( 100 ) determines and delivers...
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7271968 |
Head protection circuit of hard disk drive
A head protection circuit that protects a write head and a magnetoresistive (MR) read head by bypassing electrostatic charge applied to the write head when the power of a preamplifier is turned...
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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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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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7242545 |
Asymmetric compensation circuit
An apparatus, method, and system for providing asymmetric signal correction in a HDD system using magneto-resistive (MR) heads for reading information stored thereon. The MR head produces a signal...
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7239467 |
Storage media reading writing system
The storage media recording/writing system includes a media drive circuit, a head retaining means, a head moving means, a head drive circuit, a signal processing circuit, and a controller to...
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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...
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7209307 |
Variable read output impedance control circuit for a magnetic media storage system
A variable read output impedance control circuit of the present invention includes a variable impedance circuit as the output impedance of a magnetic media storage system. Preferably, the variable...
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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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7199956 |
Disk drive self-servo writing using fundamental and higher harmonics of a printed reference pattern
Disk drive self-servo writing includes transferring a reference pattern by magnetic printing onto a reference disk, wherein the resulting printed reference pattern includes embedded servo...
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7190541 |
Hi-speed preamplifier write driver for hard drive with improved symmetry
A write driver ( 38 ) produces balanced voltages across head ( 32 ) by using the input write data (WDX and WDY) drive transistors of a slower transistor type (typically PNP) on one half of an...
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7177107 |
Preamplifier circuit with signal interference cancellation suitable for use in magnetic storage devices
In one illustrative example disclosed, a magnetic storage device includes at least one magnetic disk; a magnetic head which includes first and second read sensors; a suspension which supports the...
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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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7167331 |
Electrostatic discharge protection circuit for magneto-resistive read elements
A magnetic storage system includes a read element including a tunneling giant magneto-resistive (TGMR) sensor. A shunting device includes a control terminal and first and second terminals that...
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7133233 |
Disk drive with read while write capability
A disk drive includes recording media having one or more recording surfaces, one or more transducer heads positionable relative to the recording surfaces by an actuator operating within a head...
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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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7126774 |
Magnetic recording and reproducing apparatus
A magnetic recording and reproducing apparatus includes a separator and first and second amplifiers. The separator separates a servo data signal and a user data signal, both reproduced by a...
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7119977 |
Reduced recovery time for perpendicular recording systems
User data is read from a medium having servo data and user data encoded thereon. The user data is read with a read/write head that is operable in a write mode and a read mode. Servo data is read in...
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7110204 |
Process-insensitive write current generation for a HDD preamplifier writer equipped with parallel output resistive damping
The present invention achieves technical advantages as an improved Parallel Damping scheme suitable for very-low-supply preamp operation. The improved Parallel Damping Scheme accurately generates a...
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7106536 |
Write head demagnetizer
A demagnetizer for an inductive load having a driver circuit including at least one transistor and a ramp-down voltage source switchably connected to the driver circuit, so that when the ramp-down...
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7099098 |
Preamplifier circuit and method for a disk drive device
An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled...
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7088537 |
Removing residual magnetization in a data transducer
Method and apparatus for removing residual magnetization in a data transducer, such as a recording head used to write data to a recording medium in a data storage device. A residual magnetization...
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7085089 |
System and method for reducing circumferential transition incoherence in servowriting operations and magnetic disk drive incorporating the same
For use with a servowriter that includes a writer core having a plurality of transistors that route servowriting current in response to a servo write signal, a write transition controller, a method...
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