Matches 451 - 500 out of 509 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
5042021 Eccentricity correction apparatus for an optical disc device  
An optical disc apparatus includes a tracking device which positions the beam light on the recording track of an optical disc in order to carry out at least recording or reproducing of information...
5040084 Disk drive system and method  
Method and apparatus is provided for writing and reading data from a rotatable disk. Utilizing the apparatus of the present invention, the method includes the steps of formatting the disk with a...
5033039 Positioning system for flexure mounted read/write head  
A random access information storage disk drive system of the optical or magneto-optical type with the read/write head mounted between parallel flexures for suspension in a linear actuator motor....
5012362 Apparatus for positioning a transducer for recording, reproducing or erasing information on a medium  
An apparatus of the invention is capable of shifting a transducer, such as a head for erasing, reproducing and recording information on a track formed on a recording medium, with fine positioning...
5005089 High performance, high capacity micro-winchester disk drive  
A micro-Winchester disk drive subsystem includes a data block sequencer, cache memory and interface for a host computing machine. The drive includes a base and a plurality of non-removable directly...
5003415 Adaptive head positioning servo-mechanism  
A servo system for compensating for environmental forces acting on, for example, a disk drive. A circuit is provided for causing an electrical current to flow in the voice coil controlling a...
4992893 Alignment disk for magnetic disk driving apparatus and method and apparatus for verifying tracking error of the magnetic disk driving apparatus  
An alignment disk having an adjust signal recorded thereon to maintain data interchangeability of a magnetic disk drive apparatus and loadable and unloadable to and from the magnetic disk drive...
4985882 Track access control system for disk system, having eccentricity correction means  
A track access control system for a disk storage system having an eccentricity correction unit. The eccentricity correction unit includes an eccentricity detecting unit, an eccentricity data...
4982295 Method for centering a read/write head of a magnetic data storage apparatus on a track of a magnetic disk  
A method of centering a read/write head of a magnetic data storage apparatus on a desired track comprises steps of defining an inside reference track and an outside reference track on the magnetic...
4982297 Head positioning system for compensating for erroneous detection of recorded position error information  
A head positioning system includes a calculating circuit for outputting a signal u k corresponding to an equilibrium of a step motor for driving a head on the basis of a position error of the head...
4977470 Track-following control system for magnetic disk drive  
A track-following control system for a magnetic disk drive according to the present invention includes a magnetic disk, a magnetic head, a position error signal generator, a controller, and a...
4974109 Hard disk drive employing a reference track to compensate for tracking error  
A magnetic disc apparatus wherein off-track quantities are stored with regard to reference servo tracks formed circularly in divided data areas on a magnetic disc and, at the time of displacing the...
4969059 Offset nulling system for computer disk drives  
An offset nulling system is provided for use in computer disk drives to identify and compensate for actuator head position offset errors attributable to dc offsets of the disk drive control...
4949201 Disk drive head position controller with static bias compensation and plural velocity detectors  
A positioning system for a hard disk drive for rapidly and accurately positioning the disk head. A constant bias compensation signal is injected into the feedback loop to reduce positioning delays...
4939599 Method and apparatus for measuring dynamic track misregistration  
A method and apparatus for measuring dynamic head and track misregistration in, for example, a magnetic disk file. A reference signal waveform is recorded onto a track on a recording medium. The...
4935835 Magnetic media containing reference feature and methods for referencing magnetic head position to the reference feature  
A magnetic medium including a physical reference feature for conveying positional information to a magnetic read/write head. The reference feature is made by indelibly marking a pattern on a...
4931888 Tracking servo control for disc drive  
A tracking servo for a floppy disc drive or the like employs a plurality of servo tracks recorded between adjacent data tracks on the floppy discs, with the signals from adjacent servo tracks on...
4918972 Dual reference track scheme  
A method and apparatus for performing adaptive calibration of a disk drive assembly and for determining an offset value to compensate for differences in servo head to data head distance from a...
4916562 Magnetic disk storage equipment  
Magnetic disc storage equipment for recording and reproducing signals on a magnetic disc comprising a carriage for shifting a magnetic head in a radial direction of the magnetic disc upon which is...
4907214 Eccentricity correction apparatus for an optical disk device  
An optical disc apparatus includes a tracking device which positions the beam light on the recording track of an optical disc in order to carry out at least recording or reproducing of information...
4907109 Magnetic disc drive system having automatic offset and gain adjustment means  
A magnetic disc drive system includes a magnetic head, an actuator for moving the magnetic head, a control current detection circuit detecting a control current flowing through the actuator, a...
4907107 Method for positioning a magnetic head in accordance with digital peak values corresponding to servo data and magnetic disk positioning apparatus for the same  
A magnetic disk driving apparatus comprises a driving section for driving a magnetic head on a destination track, in response to an input drive instruction, a detecting section for detecting peak...
4896228 Magnetic disc apparatus having improved head position control  
A data recording magnetic disc apparatus having a plurality of recording surfaces formed on one or more discs has a single servo sector containing servo data for transducer position control...
4893201 Track access control system for magnetic disk apparatus  
An improved track access control system for a magnetic disk apparatus connectable to a variety of host controllers without any change thereto, and capable of an offset correction. A control unit in...
4890172 Automatic servo gain calibration system for a disk drive  
A method for automatically calibrating gain parameters of a servo control including a track position detector for a computer disk drive. The method generally comprises the step of encoding AB...
4882671 Microprocessor controlled rigid disk file subsystem  
A control system for a micro-Winchester or smaller disk file includes head position control circuitry including at least one servo loop for controlling an electromechanical head positioner relative...
4878135 Method and system for a magnetic disk drive employing a quadratic compensation function for determining an offset correction value  
A head positioning system for use with a magnetic disk with outer, middle and inner servo tracks which are radially separated by data tracks. The head positioning system includes a measuring...
4868470 Apparatus and method for detecting a true average of N signal samples  
A true average peak detector includes an input capacitor having a capacitance C and an output capacitor having a capacitance nC. N voltage samples are successively stored on the input capacitor and...
4843496 Track-finding servomechanism utilizing the sampled output of an envelope comparison  
A servomechanism finds an optimum location for a transducer relative to a track on a magnetic disk by sampling signal strength for a plurality of transducer trajectories. By processing the...
4835631 Apparatus for controlling playback head tracking for rotary recording medium using average peak envelope position  
A device for tracking a rotary recording medium includes a playback head for reading a signal from any of a plurality of tracks which are formed on the rotary recording medium, which is rotating at...
4831471 System for positioning a magnetic head at a center line of a floppy disk track  
A head positioning system capable of positioning a magnetic head at the center line of a target track of a floppy disk at high speed, in which a positioning controller prepositions the magnetic...
4827362 Magnetic disk device having compensation for dimensional change  
An off-set signal provided from an off-set detector is stored in a memory. When a head is positioned on a data track, an off-set signal stored in the memory is read out to correct the head position...
4819095 Method of controlling a disk head position by individually timing zones servo information  
An information recording disk driving device includes an information recording disk having servo tracks formed at predetermined regions which include servo information. The driving device is...
4802033 Predictive positioning offset compensation for high TPI disk systems  
Trackwise disparity between inductive record and magneto-resistive playback heads which are built on a common support is measured and memorized. Thereafter, during head-positioning, the memorized...
4788608 Head positioning system for positioning a magnetic head on an eccentric target track  
A head positioning system for driving a magnetic disk from its current track to a target track in the radial direction of a magnetic disk. The positioning system employs a closed loop servo system...
4775903 Sampled servo seek and track follow system for a magnetic disc drive  
An improved method and apparatus for performing seek and track follow operations in a disc drive provides time varying acceleration profile and track position trajectory signals which have the same...
4775966 Optical information recording apparatus with eccentricity correction circuit  
An optical information reproducing apparatus wherein a light spot is projected on a rotary disc on which information is recorded, thereby to reproduce the information recorded on the disc, is...
4764914 Least squares method and apparatus for determining track eccentricity of a disk  
A transducer head, held in a fixed position as a preformatted disk is rotated a full revolution, reads any sector address accessible to the head. The addresses read come from a plurality of track...
4755977 Runout compensation for a coarse tracking servo system in an optical disk storage unit  
An optical disk storage unit has an access and tracking system with a microprocessor which stores a runout signal representing the eccentricity of the tracks and bands as a function of the rotation...
4724370 Servo system for a disk drive  
A servo system intermittently samples servo sectors from a data disk to obtain the position of the read/write head and to maintain an on-track alignment. A glass scale measures the movement of the...
4616276 Disk file servo control system with fast reduction of repeatable head position error  
An improvement to a disk file servo control system removes repeatable error from the read/write head position error signal (PES) during track following. The disk file includes a microprocessor 60...
4594622 Track following servo system for a disk file  
The performance of a track-following servo system for a disk file is improved by the feeding forward of a prediction of track eccentricity into the normal feedback control loop. The eccentricity...
4589037 Servo control system using a varying frequency servo pattern for read/write head positioning in a magnetic recording disk file  
An improved magnetic recording disk drive, in particular a flexible disk drive, includes a head positioning servo system which utilizes servo information recorded on the disk by the disk drive. The...
4561028 Apparatus and method for reading and writing data on a magnetic disc  
Apparatus and method for controlling a magnetic head carriage while reading or writing data on a magnetic disc by the use of a pair of heads having zero intertrack spacing and having azimuth angles...
4536809 Adaptive misposition correcting method and apparatus for magnetic disk servo system  
A misposition correction system for correcting misposition errors due to spindle runout and other slowly varying errors in a servo positioning system of a magnetic disk storage device. The system...
4530020 Self-timed runout correction pattern  
A runout correction pattern is recorded on the peripheral track of the disk during the initial recording of the data stored thereon. The runout correction pattern comprises an integer number of...
4485418 System and method of locating the center of a track on a magnetic storage disk  
A system and method of accurately locating the center of a previously recorded magnetic track on a rotating magnetic storage disk and moving a transducer to the center of the track. The system...
4412165 Sampled servo position control system  
Servo records provided at intervals on a record medium are used in a sampled servo system to define data tracks on the medium. Asperities in the medium, or problems arising from the servo writing...
4380034 Track centering servo pulse noise filter  
A track centering servo pulse noise filter is provided. Prerecorded pulses on a disk track's even and odd half tracks are sensed by the disk's read head, preamplified, DC biased, peak detected, and...
4371960 Measurement of disc servo head/data head misalignment  
Compensation for radial misalignment between a data head and a servo head is provided. At least one pair of servo data tracks having a servo null there between are written on each data surface. The...
Matches 451 - 500 out of 509 < 1 2 3 4 5 6 7 8 9 10 11 >