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7380134 Information recording/reproducing apparatus and method of executing encryption processing  
An information recording apparatus has a content encryption section which encrypts content information with an encryption key and outputs encrypted content information, a control section which...
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...
7245448 Information recording apparatus and data writing control device therefor  
A plurality of recording media combined integrally having a plurality of recording surfaces; and a plurality sets of reading heads and writing heads, combined integrally, provided for the...
7177105 Disk synchronous write  
An apparatus, method, and system for writing data to a hard disk drive synchronous with an apparent disk speed. The apparatus, method, and system has a phase-locked loop (PLL) to generate am output...
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...
7106534 Method for compensating timing to start data recording and magnetic disk device using same  
Head-to-head variations in the head gap distance between write and read heads is compensated by measuring the head gap distance in each head by writing and reading a predetermined unique pattern,...
7092187 Magnetic recording and reproducing apparatus and method and thin film magnetic head used therein  
The present invention provides a magnetic recording and reproducing apparatus, a magnetic recording and reproducing method, and a thin film magnetic head that enable a good contact between elements...
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...
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...
7012775 Writer for head positioning information over recording medium  
A writer for head positioning information, or a so-called servo track writer allows the read gap to follow a track which has been established on a recording medium or disk. As long as the read gap...
6980385 Apparatus for information recording and reproducing  
In order to generate a sampling clock having a higher accuracy, a synchronous signal generating circuit is provided with a phase error detector, detecting a phase error of a read out signal...
6975110 Magnetic sensor utilizing magnetoresistance effect, method for driving magnetic sensor utilizing magnetoresistance effect and magnetic recording systems  
The invention relates to a magnetic sensor utilizing a magnetoresistance effect, a method for driving a magnetic sensor utilizing a magnetoresistance effect and a magnetic recording system, and an...
6954325 Method and disc drive for writing servo wedges  
A method and disc drive are disclosed that write servo wedges to a plurality of tracks of a disc. A head having a read element offset from a write element reads a servo wedge on a first track as a...
6954321 Method and apparatus for improved read-to-write transition time for a magneto-resistive head  
Magneto-Resistive (MR) head read/write channel ( 400 ) provides timer ( 421 ), detector ( 433 ) and amplifier ( 432 ) to reduce the amount of time required to transition from read mode to write...
6882492 Cassette type audio data or signal recording and reproducing apparatus  
A cassette type audio signal recording apparatus comprising a recording detection sensor for generating a predetermined detection output as a recording button is pressed, a recording head for...
6791776 Apparatus for information recording and reproducing  
In order to generate a sampling clock having a higher accuracy, a synchronous signal generating circuit is provided with a phase error detector, detecting a phase error of a read out signal...
6717761 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...
6639747 Signal recording and reproducing method and signal recording and reproducing unit  
The present invention relates to a signal recording and reproducing method used for video tape recorder. An erasing position precedes a recording position and a reproducing position precedes the...
6628467 Input/output multiplex system for a read/write channel in a disk drive  
This invention provides a read/write channel with a multiplex input/output system for a disk drive, which may have one or more magnetic disks, one or more read/write heads, and a read/write...
6577464 Magnetic recording device having first actuator for coarse adjustment and second actuator for fine adjustment  
In a magnetic recording device, a control element placed on a flexible wiring board between a control device and first actuators includes a plurality of actuator-driving-signal connecting terminals...
6535953 Magnetic disk, method of accessing magnetic disk device, and recording medium storing disk access control program for magnetic disk device  
A magnetic disc apparatus according to the present invention is one which is provided with a host interface unit 2 which controls the interface connected to a host apparatus 1 , a command...
6525895 Reproducing apparatus  
A reproducing apparatus for reproducing an information signal recorded on a recording medium is provided with a reproducing part arranged to reproduce the information signal recorded on the...
6522492 Write to read switching time trim circuit  
An offset circuit to correct an offset between differential signals includes a read circuit to read the differential signals, a circuit to measure the offset of the differential signals, and a...
6473256 Method and apparatus for a 200 NS write to read switch time circuit  
The present invention includes a circuit which can achieve a 200 nano second write to read time. The present invention eliminates a switch in the RMR measurement circuit.
6445527 Method and apparatus to reduce magneto-resistive drive electromigration and improve drive yields  
Multi-head disk drive system measures head resistances and selects lowest-resistance heads for track-servo operation during sleep mode, thereby substantially prolonging EM lifetime, improving field...
6356403 Rotary magnetic head apparatus having reproduction signal wiring, power-supply wiring and recording signal wiring sections in a rotor and a stator arranged in a predetermined manner  
A rotary magnetic head apparatus is provided which can be formed into a small size even if a plurality of reproduction heads are provided. The rotary magnetic head apparatus includes a rotary drum...
6351507 Reproducing apparatus capable of generating clock signal synchronized in phase with reproduced data  
In an information signal recording and reproducing apparatus, reproduced data is equalized by an equalizer and a clock signal synchronized in phase with the reproduced data is generated. An...
6331920 Backward compatible head and head positioning assembly for a linear digital tape drive  
A tape recording and playback unit records and reads back data from tape either in a high track density standard format or alternatively reads back data from a tape previously recorded on another...
6249397 Device for reading and writing data on magnetic recording layer of photo film  
A magnetic read-write device with a magnetic head consisting of a core and a coil. The read-write device is incorporated into in a camera. A writing circuit is connected directly and in parallel to...
6219194 MR head read amplifier with improved write to read recovery time  
An apparatus for substantially eliminating a switching voltage transient in a magnetic recording system so as to minimize a write-to-read recovery time includes a first bias enable switch, a bias...
6188532 Backward compatible head and head positioning assembly for a linear digital tape drive  
A tape recording and playback unit records and reads back data from tape either in a high track density standard format or alternatively reads back data from a tape previously recorded on another...
6151181 Magnetic disk device with dummy write function  
A magnetic disk device of embedded-servo type is capable of performing dummy operation for suppressing waveform degradation of signal reproduced by magnetic heads at a high speed with high...
6141502 Magnetic recording and regenerating unit for photographic film and camera  
A magnetic recording and regenerating unit for photographic film and a camera, which feed photographic film coated with a magnetic recording layer, records magnetic information in the magnetic...
6137943 Simultaneous video recording and reproducing system with backup feature  
In a recording support mode, states of an HD device and a VTR are detected, and if the two are normal, video signals are recorded in both. The signal recorded in the HD device can be reproduced...
6118605 System for gap positioning optimization in a tape drive  
The system for gap positioning optimization in a tape drive takes advantage of the presence of a pair of read heads, located one on either side of the write head, to precisely determine the...
6111718 Electronic record/play switch with low noise low input impedance preamplifier  
The present application discloses an electronic switching device in combination with a low noise, low input impedance preamplifier circuit. The resulting electronic preamp assembly is specifically...
6088183 Arcuate scan read/write assembly  
A circuit having a stationary portion and a rotating portion suitable for an arcuate scan assembly in a storage device is disclosed. The circuit includes a stationary encoder outputting an encoded...
6052510 Apparatus for recording, reproduction or erasing  
A recorder is disclosed, in which recording is effected while retrieving non-recorded blocks of a disk-like recording medium, and which is provided with means for such control that when no...
6028729 Magnetic head with read and write coils and a circuit for interrupting a mutual induction of the coils  
An apparatus provided with a magnetic head including a core, a writing coil and a reading coil wound around the core; a writing circuit connected with the writing coil for driving the writing coil;...
5995310 Magnetic disk device with dummy write function  
A magnetic disk device of embedded-servo type is capable of performing dummy operation for suppressing waveform degradation of signal reproduced by magnetic heads at a high speed with high...
5987267 Magnetic recording/reproducing apparatus of camera  
A magnetic recording/reproducing apparatus of a camera, includes; a magnetic head having a single coil; a recording circuit that causes the magnetic head to record magnetic information on a film; a...
5986840 Amplifier with capacitive feedback for driving a magneto-resistive head  
A MR head amplifier of the present invention prevents a base potential of a transistor which supplies a current to a MR element from changing in a moment when the MR element changes from a...
5978164 Signal reproducing circuit adapted for head utilizing magneto-resistive effect  
A signal reproducing circuit includes a magneto-resistive effect head having one end thereof coupled to a first power supply line, for reproducing data recorded on a magnetic recording medium in a...
5923707 Reproducing apparatus capable of generating clock signal synchronized in phase with reproduced data  
In an information signal recording and reproducing apparatus, reproduced data is equalized by an equalizer and a clock signal synchronized in phase with the reproduced data is generated. An...
5886843 Recording and playback apparatus using a helical-scan-type rotary head  
In order to enable both reproduction of the azimuth-recorded old format and recording and reproduction of the new format of a different azimuth angle without increasing the number of heads, the...
5825571 Input switching network  
A circuit for input switching for a read channel is described. The present invention suppresses unwanted signals at the input of a read channel. The present invention uses an open impedance...
5815333 Magnetic disc with a flat RAM area and disc device  
A magnetic disc having a ROM area and a RAM area which are separated. The ROM only plane and the RAM only plane are separated on the magnetic disc.
5808820 Magnetic disk unit  
A magnetic disk unit of the invention comprises; a thin film magnetic head 1 for performing a specified magnetic recording/reproducing operation on a magnetic disk, a reproduction error...
5796538 Multi-deck video cassette recorder system  
An improved multi-deck VCR system for performing a combination operation and a series playback operation comprises at least three VCR units, a remote control unit for selecting one of a variety...
5796536 Automatic calibration of a rotary head switching signal  
A head switching signal calibrating apparatus includes a rotating reproduction device for reproducing data stored on a magnetic tape and a controller for calibrating a head switching signal as a...
Matches 1 - 50 out of 288 1 2 3 4 5 6 >