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US20150213815 SYNTHETIC ANTIFERROMAGNETIC READER  
Implementations disclosed herein provide for an apparatus, comprising a synthetic antiferromagnetic reader structure, wherein total moment of a pinned layer is substantially greater than total...
US20080043357 Gain control device, storage device and, gain control method  
Before a system area of the storage device is read immediately after the activation of the storage device, a read signal is output from a magnetic head to read servo information in the system...
US20130250446 Spacing Fluctuation Compensation  
A method to compensate for spacing variations between a dynamic fly height (DFH) controlled read/write head and a rotating disk surface. Using a HDI sensor or equivalent indicator of touchdowns, a...
US20150062735 DUAL READER STRUCTURE  
Implementations described and claimed herein provide a stacked dual reader with a bottom sensor stack and a top sensor stack wherein the bottom sensor stack and the top sensor stack are mirrored...
US20130286499 VOLTAGE-MODE DRIVER  
A method is provided. A first CMOS switch is deactivated while activating a second CMOS switch to cause the portion of the write signal to transition from a first direct current (DC) voltage to a...
US20110188147 METHOD ADJUSTING GAIN OF VARIABLE GAIN AMPLIFIER AND APPARATUS USING SAME  
A method of adjusting gain of a variable gain amplifier of a read/write channel circuit includes loading a first VGA gain value that is read channel optimized, in a first register, loading a...
US20080002268 Write margin adjustment mechanism in a tape drive system  
A method is disclosed. The method includes monitoring a write driver to determine if a change in rewrite activity to a medium has changed and adjusting a percentage of error correcting code (ECC)...
US20090144966 LEADING EDGE TAPERED BUMP WITH ELECTRICAL LAPPING GUIDE CONTROL FOR WRAP AROUND SHIELD  
A method for manufacturing a perpendicular magnetic write head having a trailing shield and with a tapered step. The method includes forming a write pole with a non-magnetic trailing gap and first...
US20070070535 Storage system and component replacement processing method thereof  
A storage system is constructed by a hierarchy of a primary storage device and a secondary storage device. A storage system has a hierarchy of a primary storage device, secondary storage devices...
US20120281306 PRINTED CIRCUIT CABLE ASSEMBLY FOR A HARD DISK DRIVE  
A printed circuit cable assembly (PCCA) for a hard disk drive (HDD) is disclosed. The PCCA includes a stiffener portion having an elongated shape that includes an integrated circuit (IC) chip. The...
US20050207053 Write current waveform asymmetry compensation  
A write current circuit (300, 400) adapted to drive a thin film write head (202) of a mass media information storage device. The write current circuit (300, 400) further includes programming...
US20120008227 HEAT TRANSFER FOR A HARD-DRIVE PRE-AMP  
A substrate for mounting a preamp chip thereupon, fabricated using a stiffener layer made of a conductive material; an insulating layer provided over the circuitry area of the substrate; a...
US20080204914 Low Power Write Driver for a Magnetic Disk Drive  
A write driver (11) for a disk drive system is disclosed. The write driver (11) includes a normal H-bridge drive circuit (30) and a boost H-bridge drive circuit (32). The normal and boost H-bridge...
US20150138664 FPC ASSEMBLY AND DISK DRIVE  
According to one embodiment, there is provided an FPC (Flexible Printed Circuits) assembly including an FPC and a reinforcing plate The reinforcing plate reinforces a part of the FPC. The...
US20130135765 PERPENDICULAR MAGNETIC RECORDING WRITE HEAD WITH LADDER NETWORK COMPENSATION CIRCUITRY ON SLIDER BODY FOR WRITE CURRENT OVERSHOOT AT WRITE CURRENT SWITCHING  
Write enhancement circuitry on the head carrier of a magnetic recording disk drive provides additional write current overshoot beyond that provided by the write driver circuitry. The write...
US20070019317 System partitioning for hard disk drive electronics  
A hard disk drive chip set includes an analog chip including all of the analog functions for the hard disk drive except for a motor controller, and a digital chip including all of the digital...
US20150255109 Non-Decision Directed Magnetoresistive Asymetry Estimation  
Systems and methods for magnetoresistive asymmetry estimation may include, but are not limited to, operations for: receiving a magnetic read head transducer output; computing a mean value of the...
US20070127149 Offset cancellation scheme for perpendicular reader  
A reader input amplifier for a hard disk drive including a gm-amp that compensates for any X-Y imbalance to reduce an excursion, and the time period of the excursion until a final settling point.
US20090244758 Hard Disk Drive Preamplifier Timers and Methods to Calibrate Hard Disk Drive Preamplifier Timers  
Hard disk drive preamplifier timers and methods to calibrate hard disk drive preamplifier timers are disclosed. A timer is in a hard disk drive preamplifier comprises a first switch to selectively...
US20110149425 SYSTEM FOR MONITORING LSI SUPPLYING CURRENT TO LOAD  
According to one embodiment, A system includes a first LSI, a second LSI, a controller and a current monitoring and determination module. The first LSI operates on a first power supply voltage...
US20060132951 Magnetic read/write device preventing malfunction due to reversal in polarity  
Embodiments of the invention provide a magnetic read/write device capable of reading/writing data even when a reversal of the output polarity of the readback signal occurs. In one embodiment, a...
US20150255101 TRACK MISREGISTRATION SENSITIVE INITIALIZATION OF JOINT EQUALIZER  
A method of mitigating an effect of track misregistration on read performance in a system comprising an array-reader includes determining an estimated off-track condition, selecting translation...
US20150138663 MAGNETIC RECORDING DISK DRIVE WITH WRITE DRIVER TO WRITE HEAD TRANSMISSION LINE WITH MULTIPLE SEGMENTS HAVING DIFFERENT NUMBERS OF CONDUCTIVE TRACES  
A multiple-segment transmission line in a hard disk drive enables a wider optimization range of the slope, duration and amplitude of the transmission line overshoot (TLO) wave shape. There is a...
US20150213813 PREAMPLIFIER FOR ADJUSTABLE WRITE CURRENT  
The implementations disclosed herein provide for a storage device including a preamplifier that dynamically adjusts at least one of a rise time and fall time of an analog write current pulse based...
US20060193071 HIDID PreAmp-to-host interface with much reduced I/O lines  
The present invention achieves technical advantages as a Preamp enabled to use different functional blocks inside the Preamp only during their own “active” modes. When a block is “inactive”, its...
US20080278838 Thermal asperity detector and methods for use therewith  
A thermal asperity detector for use in a hard disk drive includes a magnitude detector that produces a magnitude signal from a read head signal. A filter module filters the magnitude signal to...
US20120019947 TECHNIQUE FOR PROGRAMMABLE RISE TIME IN HARD DISK DRIVE WRITER  
A write channel for a hard disk drive has a write current with a programmably adjustable rise time, and includes first and second analog write data signal paths having respective resistive nodes....
US20060119970 Semiconductor device and magnetic recording system using the same  
A write driver circuit capable of controlling the waveform of overshoot of a write current, more specifically, controlling a rise, amplitude, and duration of overshoot (OS) in the waveform of an...
US20140104717 ZERO GAIN START AND GAIN ACQUISITION BASED ON ADAPTIVE ANALOG-TO-DIGITAL CONVERTER TARGET  
Aspects of the disclosure pertain to a system and method for providing zero gain start (ZGS) and gain acquisition based on an adaptive analog-to-digital converter (ADC) target. The adaptive ADC...
US20080055760 Disk drive write driver and associated control logic circuitry  
An H-bridge driver for a disk drive system includes first and second high side switched legs and first and second low side switched legs. An inductor head for writing data to and reading data from...
US20090002883 Wire-assisted magnetic write device with phase shifted current  
A magnetic device includes a write element having a write element tip and a conductive coil for carrying a current to induce a first field from the write element. A conductor proximate the write...
US20140300984 CIRCUITS AND METHODS FOR CANCELLING A REFLECTED WAVE  
Method and circuits for cancelling reflected waves from a load are disclosed. An embodiment of the method includes transmitting a signal to the bad from a current source, wherein a transistor is...
US20070236819 Hard Disk Drive Preamplifier with Reduced Pin Count  
A disk drive controller including a preamplifier and a controller is disclosed, in which communications between the controller and the preamplifier are carried out over at least some shared...
US20140368944 ANALOG FRONT END FOR PROXIMITY SENSING OF TUNNELING CURRENT  
A circuit includes an input that receives a current that increases as a tunneling current sensor moves closer to a media. A high gain path is operatively coupled to the input to amplify the...
US20060256463 Gain controller for a gain loop of a read channel and related gain loops, read channels, systems, and methods  
A gain controller for a gain loop of a read channel includes a comparator circuit, an accumulator circuit, and a function circuit. The comparator circuit determines an error between an actual...
US20140029128 Saturation-Based Loop Control Assistance  
The present inventions are related to systems and methods for data processing, and more particularly to data processing using distortion-correction loops with saturation-based assistance.
US20140226233 STORAGE DEVICE WITH REFLECTION COMPENSATION CIRCUITRY  
A hard disk drive or other storage device comprises a storage medium, a write head configured to write data to the storage medium, and control circuitry coupled to the write head. The control...
US20060072231 Current mirrors having fast turn-on time  
A current mirror circuit providing a fast turn on time. A node within the circuit is held at a first voltage when the current mirror is off to permit the node voltage to quickly reach a necessary...
US20080002267 Method and apparatus for slew rate control in the write current shape of a hard disk drive  
Operating a write head by slew rate determining a slew rate control based upon a slew rate and the track being written and controlling the write current waveform based upon the slew rate control...
US20100214683 PRINTED CIRCUIT CABLE ASSEMBLY FOR A HARD DISK DRIVE  
A printed circuit cable assembly (PCCA) for a hard disk drive (HDD) is disclosed. The PCCA includes a stiffener portion having an elongated shape that includes an integrated circuit (IC) chip. The...
US20140139941 PREAMPLIFIER OUTPUT CURRENT CONTROL  
One embodiment includes a preamplifier system. The system includes a reference stage configured to set a magnitude of a clamping voltage for a reference node based on a reference current generated...
US20140029127 Over-the-Rail Write Driver for Magnetic Storage Systems  
A write driver circuit for generating a write current pulse for use by a magnetic write head includes an output stage adapted for connection with the magnetic write head and a charge storage...
US20140320994 ELECTRIC FIELD WRITING MAGNETIC STORAGE DEVICE  
An electric field writing magnetic storage device including: a rotatable disk including a substrate and a magnetic recording film provided on a surface of the substrate, the magnetic recording...
US20060256464 Phase acquisition loop for a read channel and related read channel, system, and method  
A phase-acquisition (PA) loop for a read channel comprises an accumulator, a comparator, and a filter. The accumulator holds an acquired phase-correction value corresponding to a difference...
US20140168809 TAG MULTIPLICATION VIA A PREAMPLIFIER INTERFACE  
An apparatus having a controller and a preamplifier is disclosed. The controller may be configured to generate information on a serial bus coupled to a preamplifier interface. The preamplifier may...
US20110141603 HEAD/DISK CONTACT DETERMINATION  
A disk drive including a sensor element that senses contact between a head slider and a disk, a head integrated circuit (IC) comprising an amplification circuit section that amplifies a signal of...
US20060103964 Variable control of write parameters for hard disk drive  
A hard disk drive that changes a variable write parameter of a head during a write operation. The controller can change the variable write parameter to compensate for a transient temperature...
US20110188146 IC PROTECTION CIRCUIT, METHOD FOR PROTECTING IC, AND APPARATUSES HAVING THE IC PROTECTION CIRCUIT  
An electronic device includes a power supply line connected between a DC power supply and an integrated circuit, and a first electronic element and a second electronic element serially connected...
US20130148223 IMPLEMENTING SPIN-TORQUE OSCILLATOR SENSING WITH ENHANCED DEMODULATOR FOR HARD DISK DRIVES  
A method, apparatus, and system are provided for implementing spin-torque oscillator (STO) sensing with a demodulator for hard disk drives. The demodulator measures an instantaneous phase of the...
US20060209445 Magnetic disk drive and write current control method therein  
A magnetic disk drive and a write current control method are provided in which stable writing can always be carried out at the time of information writing without being subject to a thermal effect...

Matches 1 - 50 out of 122 1 2 3 >