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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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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)...
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...
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...
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...
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...
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)...
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...
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...
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...
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...
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 ,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
7097110 Temperature compensation systems and methods for use with read/write heads in magnetic storage devices  
Disclosed herein are methods and systems for sensing and controlling the temperature of a resistive element configured for use in a read/write head of a magnetic data storage device. In one...
7092188 Method for assembly level disk erase  
A method of erasing information on one or more disks in a disk drive uses a high strength magnetic field to erase the disks while the disks are in the HDD assembly. The design of the head disk...
7092186 Demagnetizing a head in a disk drive by increasing the frequency of an AC write signal while maintaining the write current amplitude  
A disk drive is disclosed which demagnetizes the head after a write operation. Write circuitry applies a write signal to the head in order to write data to a selected data sector during a write...
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...
7085088 Method of controlling reader amplifier gain variations of a HDD preamplifier, or the like  
An amplifier ( 70 ) has a differential input stage ( 84,86 ). An output transistor ( 102 ) is connected to receive a single ended output developed by transistor 86 . First ( 74 ) and second ( 76 )...
7079345 Demagnetization of magnetic media for data storage device using gradually reduced magnetic field  
Demagnetizing magnetic media for recording data in a data storage device includes placing the magnetic media in a magnetic field at a first strength, and gradually reducing the magnetic field to a...
7079340 Apparatus and method of measuring write magnetic field of recording head  
After a measurement apparatus records a magnetization state of a reference pattern on at least one specific track of a recording medium, it generates a leakage magnetic field of a demagnetization...
7061321 Low impedance read amplifier for magnetoresistive head  
A read amplifier system for connection through interconnects to a magnetoresistive (MR) head includes two input transistors, two bias transistors connected to the two input transistors by common...
7050256 Fast erase method and apparatus for digital media  
A non-contact fast erase method for erasing information stored on a magnetic or optical media. The magnetic media element includes a magnetic surface affixed to a toroidal conductor and stores...
7050255 System and apparatus for assembly level disk erase  
A disk erase apparatus for erasing information on one or more disks in a disk drive uses a high strength magnetic field to erase the disks while the disks are in the HDD assembly. The design of the...
7035028 Disk drive write driver with boosting circuit to improve output voltage swing  
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...
7031089 Tape head assembly  
A tape head assembly comprises a transducer head having plural arrays of transducing elements, the transducing elements comprising at least one of write elements and read elements. The tape head...
7027249 Data erasing apparatus  
The invention enables a magnetic disk drive to be inserted and removed against an attraction force exerted by a magnetic force that is strong enough to erase data on a magnetic disk enclosed within...
7019930 Digital filtering and digital automatic gain control for a variable speed read channel  
A method and system are disclosed for providing a variable speed digital read channel. The read channel includes an analog portion and a digital portion. The read channel includes an...
RE39029 Magnetic recording/reproducing apparatus with the recording/reproducing heads preceding the erasing heads  
A magnetic recording/reproducing apparatus is provided in which among diametrically oppositely disposed heads, a recording head and an erasing head of a same channel are disposed adjacently to each...
7006314 Magnetic head driver circuit and magnetic storage device  
A driver circuit drives a write element for magnetic recording, and permits high speed recording while preventing noise from entering an adjacent read element. An H bridge circuit, which causes a...
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